Advanced Wireless Settings Reference Guide

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stephensuley
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Joined: 09 Feb 2008
Posts: 421
Location: Canada

PostPosted: Sun Apr 26, 2009 22:23    Post subject: Advanced Wireless Settings Reference Guide Reply with quote
NOTE - IT's now in the wiki;

http://www.dd-wrt.com/wiki/index.php/Advanced_wireless_settings


Advanced Wireless Settings Reference Guide
for DD-WRT routers.

If you have something you want to add\correct\update\contribute please post.

All ideas welcome.

_________________
1x 610Nv1, 1x 610Nv2 , 1x e3000 ,1x e4200
Latest stable build + OTRW


Last edited by stephensuley on Sun Jul 18, 2010 19:12; edited 9 times in total
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stephensuley
DD-WRT User


Joined: 09 Feb 2008
Posts: 421
Location: Canada

PostPosted: Sun Apr 26, 2009 22:45    Post subject: Reply with quote
I wanted to post the defaults to start and go from there.


The Wireless Advanced Settings screen allows you to customize data transmission settings. In most cases, the advanced settings on this screen should remain at their default values.


Authentication Type
The default is set to Auto

Basic Rate
The default value is set to Default.

MIMO - Transmission Fixed Rate
The default is set to Auto

Transmission Rate
The default setting is Auto.

CTS Protection Mode
The default value is Auto.

Frame Burst
The default value is Disabled.

Beacon Interval
Range: 10 - 65535. The default value is 100.

DTIM Interval
Range: 1 - 255. The default value is 1.

Fragmentation Threshold

Range: 256 - 2346. This value should remain at its default setting of 2346.

RTS Threshold
Range: 0 - 2347. This value should remain at its default setting of 2347.

Max Associated Clients
Range: 1 - 256. Default is 128.

AP Isolation
The default value is Off.

TX Antenna / RX Antenna

Values are Auto, Left, Right, default value is Auto.

Preamble
Values are Long and Short, default value is Long.

Shortslot Override

Values are Long and Short, default value is Auto.

TX Power
This value ranges from 1 - 251 mw, default value is 70mw. A safe value is 28mw and would be suitable for most users. Start at 28 and tweak from there.


Afterburner

The default value is disabled.

Bluetooth Coexistence Mode

The default value is disabled.

Wireless GUI Access
The default value is Enabled.

I also wanted to add;

Wireless Network Mode
Default Value: Mixed

Wireless Channel, Channel Width and Wide Channel
Default Value(s): 6, 20MHz and lower


Sensitivity Range (ACK Timing)
Default Value: 2000 meters

_________________
1x 610Nv1, 1x 610Nv2 , 1x e3000 ,1x e4200
Latest stable build + OTRW


Last edited by stephensuley on Sat May 09, 2009 20:01; edited 8 times in total
stephensuley
DD-WRT User


Joined: 09 Feb 2008
Posts: 421
Location: Canada

PostPosted: Sun Apr 26, 2009 23:03    Post subject: Reply with quote
Authentication Type
The default is set to Auto.
Currently using "Shared key" seems to cause problems. This should be left to auto with current builds.


The help file says...
Allows either Open System or Shared Key authentication to be used. For Open System authentication, the sender and the recipient do NOT use a WEP key for authentication. For Shared Key authentication, the sender and recipient use a WEP key for authentication. If you want to use only Shared Key authentication, then select Shared Key.


How it works:
The following steps occur when two devices use Shared Key Authentication:

1. The client adapter sends an authentication request to the access point.
2. The access point sends back a challenge text to the client adapter.
3. The client uses its configured 64-bit or 128-bit default key to encrypt the challenge text, and it sends the encrypted text to the access point.
4. The access point decrypts the encrypted text using its configured WEP key that corresponds to the client's default key. The access point compares the decrypted text with the original challenge text. If the decrypted text matches the original challenge text, then the access point and the client share the same WEP key, and the access point authenticates the client.
5. The client will now connect to the network.

If the decrypted text does not match the original challenge text (that is, the access point and station do not share the same WEP key), then the access point will refuse to authenticate the station, and the station will be unable to communicate with either the 802.11 network or Ethernet network.


-------------------------------------------------------


-This would add an additional layer of connection authentication for wireless clients. Using this feature means you must modify the wifi adapter settings on a client before it can connect to this device.


-Client wifi adapters must support "Shared Key" authentication to use this setting.

-If using a client connected to the router over wireless and you set authentication key to shared, from auto, and your computer doesn't support shared, you will lose all Internet access and access to the webgui and you will have to connect with a wire to the router to change the setting back to auto. You can also do a hard reset to get it back to defaults to fix this.

-I equate using "Shared key" to adding authentication security to the "Phase 1" of the wifi connection process


-Changing this from the default value would be for security reasons.


Basic Rate
The default value is set to Default.


Help file says...
Depending on the wireless mode you have selected, a default set of supported data rates will be selected. The default setting will ensure maximum compatibility with all devices. You may also choose to enable all data rates by selecting ALL. For compatibility with older Wireless-B devices, select 1-2Mbps.


MIMO - Transmission Fixed Rate
The default setting is Auto. The range is from 6.5 to 130Mbps.



Help file says...
The idea is the same as "Transmission Fixed Rate" You can select from a range of MIMO transmission speeds, or keep the default setting, Auto, to have the router automatically use the fastest possible data rate and enable the Auto-Fallback feature. Auto-Fallback will negotiate the best possible connection speed between the router and a wireless client.


How it works:
This parameter is uesd for 802.11n transmissions only. 802.11g ,b and a tramissions from the router use the "Transmission Fixed Rate" parameter.

IEEE 802.11n builds on previous 802.11 standards by adding multiple-input multiple-output (MIMO).MIMO uses multiple transmitter and receiver antennas to improve the system performance. MIMO is a technology which uses multiple antennas to coherently resolve more information than possible using a single antenna. Two important benefits it provides to 802.11n are antenna diversity and spatial multiplexing.MIMO technology relies on multipath signals. Multipath signals are the reflected signals arriving at the receiver some time after the line of sight (LOS) signal transmission has been received.MIMO uses the multipath signal's diversity to increase a receiver's ability to recover the message information from the signal.

Another ability MIMO technology provides is Spatial Division Multiplexing (SDM). SDM spatially multiplexes multiple independent data streams, transferred simultaneously within one spectral channel of bandwidth. MIMO SDM can significantly increase data throughput as the number of resolved spatial data streams is increased. Each spatial stream requires a discrete antenna at both the transmitter and the receiver. In addition, MIMO technology requires a separate radio frequency chain and analog-to-digital converter for each MIMO antenna which translates to higher implementation costs compared to non-MIMO systems.



Transmission Fixed Rate
The default setting is Auto. The range is from 1 to 54Mbps.


Help file says...
The rate of data transmission should be set depending on the speed of your wireless network. You can select from a range of transmission speeds, or keep the default setting, Auto, to have the router automatically use the fastest possible data rate and enable the Auto-Fallback feature. Auto-Fallback will negotiate the best possible connection speed between the router and a wireless client.


How it works:


CTS Protection mode
The default mode value is set to Auto.


The help file says...
When set to Auto, a protection mechanism will ensure that your Wireless-B devices will connect to the Wireless-G router when many Wireless-G devices are present. However, performance of your Wireless-G devices may be decreased.


How it works:
CTS Protection mode is a is a protection mechanism that operates on the physical (PHY) level frame. At a very high level summary of the process when multiple devices are connected to an access point, they can occasionally be transmitting data to the access point at the same time because neither one can see the other client well enough to determine if it is transmitting on the channel or not. When this happens, the AP will discard both pieces of colliding data, thus contributing to error rates. CTS (clear to send) protection skirts this issue by delegating which device gets to transmit at a given time.


CTS Protection mode and DD-wrt:
In its default configuration dd-wrt uses it as a to provide a way of ensuring coexistence between the legacy and the new wifi devices. Adding to that by using CTS protection mode and modifying RTS threshold value you can tweak the operation of the CTS protection mechanism this can then be combined with the Fragmentation Threshold tweak to help troubleshoot\fix connectivity and\or performance issues etc. Remember tweaking the CTS protection process by manipulating the RTS and the Fragmentation Threshold value often comes at a price usually by decreasing the overall throughput to the WLAN.



Once CTS Protection mode is configured correctly within your WLAN environment there are specific scenarios that occur and the software will activate the CTS protection mechanisms;

Here are a few examples of what triggers CTS to be employed by the dd-wrt router software.


CTS Protection trigger 1; - NON-default dd-wrt behavior
A client that wants to use the radio channel to send data packet(s) of a size that is equal or above the defined RTS threshold value.

CTS Protection trigger 2; -default dd-wrt behavior
A 802.11g client attempts to connect to a SSID that is using channel bonding. Transmissions using a 40 MHz channel in the presence of 802.11a or 802.11g clients require using CTS protection mode. This will apply the CTS protection mechanism on both 20 MHz halves of the 40 MHz channel, to prevent interference with legacy devices and allow proper operation of the 802.11a and 802.11g clients.

CTS Protection trigger 3; -default dd-wrt behavior
If you are running in mixed wireless mode on a 802.11n router and you have 802.11b clients in your environment. CTS Protection is used to allow the 802.11b client to operate correctly and also not to interfere with the operation of the 802.11a,g, and N client transmissions.

Also;
- An 11b device associates to the AP. - same as trigger 3
- An 11b AP on the same channel can be heard by the AP - variant on trigger 3
- The AP hears an 11g AP that is in protection because of an 11b device associated. -another variation of the trigger 3 event.




**NOTE: Trigger 1 will never happen on the dd-wrt default configuration due to the the default values of the RTS Threshold being 2347 and the the Fragmentation Threshold value being 2346. Based on the data packet fragmentation threshold default value at 2346 in size dd-wrt will apply fragmentation to all packets meeting this criteria. Because of this fragmentation process the 2347 packet size needed to trigger the RTS threshold is never reached.


For a closer look at what happens in one of these cases lets look at a case like trigger number 1 list above and the steps in the CTS protection process.


Example. A client that wants to use the radio channel to send data packet(s) of a size that is equal or above the defined RTS threshold value.


Steps in the CTS Protection mode process for the above example.

1.) The client wishing to send date over the channel first sends an RTS (request to send) packet to the AP.

2.) As the AP broadcast it beacons packet over the WLAN as part of its normal operation, The beacon packet has information within it that declares to all the clients on the entire WLAN not to try and send any information for a specified period of time. The AP then sends a CTS packet to the client that requested the CTS in the first place. The AP has made a single client the "owner" of the wifi channel and then the AP listens only to that client until it is done transmitting; its in protection mode.

3.)The process is repeated for all request to transfer data,which for whatever reason triggers the CTS protection mechanisms, on a first come first serve basis.



TWEAK:
Implementing additional CTS Protection mode triggers and there frequency of operation on top of the default dd-wrt CTS protection mode configuration;

1.) The AP running dd-wrt has the CTS Protection mode is set to Auto by default and then you could adjust the RTS threshold value to something lower then 2346 (Which is the default fragmentation threshold value on dd-wrt) on the AP.

2.) All clients connected to the dd-wrt AP are configured for CTS\RTS mode as apposed to setting of "disabled" or "CTS-Self" mode.


***NOTE Typically the The RTS Threshold value on dd-wrt is only lowered when needed to address or troubleshoot some sort of connectivity or performance issue with a client or all clients on a WLAN. Adjusting the value is a balancing act between getting your problem fixed and losing overall WLAN speed. The more times CTS protection mode is triggered in a period of time "its frequency" the more impact it will have; good or bad. So start with 2340, then 2320, 2300 etc...


Guide when to use and why.

-If your trying to tweak out every drop of performance in an ideal setup then you can disable this on the AP and clients. Test again to see if it helps for better results, it should.

-If you want to try 40MHz with your 802.11n clients you might want to start with CTS Protection set to Auto. You do this in case you have 802.11a or g or even some N clients that do not support 40GHz transmissions or "channel bonding" as it is sometimes called.

-If you have a 802.11n based router running in mixed wireless mode that you want to connect 802.11b clients you need to have CTS protection mode set to Auto meaning enabled.

-If CTS Protection makes things faster a network redesign might be needed.

-"CTS to self" based protection - an alternate implementation method of CTS; where by the device willing to send frames over the WLAN first sends a CTS frame to itself. "CTS to self" based protection has less overhead, but it must be taken into account that this only protects against devices receiving CTS frame (e.g. if there are 2 "hidden" stations, there is no use for them to use "CTS to self" protection, because they will not be able to receive CTS sent by other station - in this case stations must use RTS/CTS so that other station knows not to transmit by seeing CTS transmitted by AP).If you have set the CTS protection mode to disabled on the dd-wrt AP, then this is a good choice for the client configuration.



Frame Burst
The default is set to Disabled.


Help file say...
Frame burst allows packet bursting which will increase overall network speed though this is only recommended for approx 1-3 wireless clients, Anymore clients and there can be a negative result and throughput will be affected.



How it works?
Frame-bursting is a technique in wireless technology supported by the draft 802.11e Quality of Service specification. Frame Bursting may increase the throughput of any (point-to-point) 802.11A, B, G or N link connection in certain conditions. This is done by reducing the overhead associated with the wireless session from either:

* Access Point to Client and vice versa
* Client to Client in ad-hoc mode.

This can result in the ability to support higher data throughput in mixed and uniform networks.

It enhances the ability of a wireless client to upload data at faster speeds by using the inter-frame wait intervals to "burst" a sequence of up to three packets before waiting the required period. This allows more data to be sent and less waiting to occur, however, can result in unfair allocation of airtime where there are a mix of clients of which only some support Frame-Bursting as the inter-frame wait periods are contention periods where other stations with data to send can seize the air and send their data.


-------------------------------------------------------

-Frame Burst is useful when transferring large data, but the benefits are not as big as most people hope for.

-It allows, as name says, a client to burst many frames in a short amount of time.



Beacon Interval
Range 1 and 65,535 milliseconds. The default value is 100.

The help file says...
The Beacon Interval value indicates the frequency interval of the beacon. A beacon is a packet broadcast by the router to synchronize the wireless network. 50 is recommended in poor reception.

How it Works:


The term beacon signifies a specific data transmission from the wireless access point (AP), which carries the SSID, the channel number and security protocols such as WEP (Wired Equivalent Protection) or WPA (Wi-Fi Protected Access). This transmission does not contain the link layer address of another Wi-Fi device, therefore it can be received by any LAN client.The beacon frame, which is a type of management frame, can be likened with the "heartbeat" of a wireless LAN, enabling stations to establish and maintain communications in an orderly fashion.

What is a Beacon Interval
As mentioned above, the beacon interval is a fixed, configurable parameter. Typically, the beacon interval setting is not touched at all in the WLAN network installation phase, but the default value selected by the equipment supplier is used. If the beacon interval is long, maximum capacity in the Access Point is achieved. However, it will the take a long time for WLAN terminals to scan for Access Points in the area and to update RSSI and load information for already found Access Points. This obviously reduces terminal throughput and wastes battery. On the other hand, if the beacon interval in short, passive scanning performed by the WLAN terminals will be faster, but the overall capacity of the Access Point will be reduced.



**NOTE There are no special rules for sending beacons, and they must be sent using the mandatory 802.11 carrier sense multiple access / collision avoidance (CSMA/CA) algorithm. If another station is sending a frame when the beacon is to be sent, then the access point (or NIC in an ad hoc network) must wait. As a result, the actual time between beacons may be longer than the beacon interval. Clients, however, compensate for this inaccuracy by utilizing the timestamp found within the beacon packet information.


What is a Beacon?
A typical beacon frame is approximately fifty bytes long, with about half of that being a common frame header and cyclic redundancy checking (CRC) field. As with other frames, the header includes source and destination MAC addresses as well as other information regarding the communications process. The destination address is always set to all ones, which is the broadcast Medium Access Control (MAC) address. This forces all other stations on the applicable channel to receive and process each beacon frame. The CRC field provides error detection capability.


The beacon's frame body resides between the header and the CRC field and constitutes the other half of the beacon frame. Each beacon frame carries the following information in the frame body:

Beacon interval. This represents the amount of time between beacon transmissions. Before a station enters power save mode, the station needs the beacon interval to know when to wake up to receive the beacon (and learn whether there are buffered frames at the access point).


Timestamp. After receiving a beacon frame, a station uses the timestamp value to update its local clock. This process enables synchronization among all stations that are associated with the same access point.


Service Set Identifier (SSID). The SSID identifies a specific wireless LAN. Before associating with a particular wireless LAN, a client must have the same SSID configured as the access point. By default, access points include the SSID in the beacon frame to enable sniffing functions (such as that provided by Windows XP) to identify the SSID and automatically configure the wireless network interface card (NIC) with the proper SSID. DD-Wrt also has an option to disable the SSID from being broadcast in beacon frames to reduce security issues.


Supported rates. Each beacon carries information that describes the rates that the particular wireless LAN supports. For example, a beacon may indicate that only 1, 2, and 5.5Mbps data rates are available. As a result, an 802.11b station would stay within limits and not use 11 Mbps. With this information, stations can use performance metrics to decide which access point to associate with.


Parameter Sets. The beacon includes information about the specific signaling methods (such as frequency hopping spread spectrum, CTS Protection mode and RTS Threshold,direct sequence spread spectrum, etc.). For example, a beacon would include in the appropriate parameter set the channel number that an 802.11b access point is using. Likewise, a beacon belonging to frequency hopping network would indicate hopping pattern and dwell time.


Capability Information. This signifies requirements of stations that wish to belong to the wireless LAN that the beacon represents. For example, this information may indicate that all clients must use wired equivalent privacy (WEP) in order to participate on the network.


Traffic Indication Map (TIM). An access point periodically sends the TIM within a beacon to identify which stations using power saving mode have data frames waiting for them in the access point's buffer. The TIM identifies a station by the association ID that the access point assigned during the association process.


**NOTE Today beacon frames also contain a load information that informs WLAN terminals currently connected to a specific Access Point or considering making a handover to that Access Point about the load situation. This information helps the WLANterminals in making correct handover decision, in addition to the information from the comparisons of RSSI readings obtained by scanning, and thus ensures that WLAN traffic is divided more evenly between all Access Points in the area.



TWEAK:


By increasing the beacon interval, you can reduce the number of beacons and associated overhead, but that will likely delay the association and roaming process because stations scanning for available access points may miss the beacons.

You can decrease the beacon interval, which increases the rate of beacons. This will make the association and roaming process very responsive; however, the network will incur additional overhead and throughput will go down.

In addition, stations using power save mode will need to consume more power because they'll need to awaken more often, which reduces power saving mode benefits.
In an idle network, beacons dominate all other traffic.


Guide to tweaking:
The amount of overhead that the transmissions of beacon frames generate is substantial; however, the beacon serves a variety of functions. For example, each beacon transmission identifies the presence of an access point.

How a beacon interval impacts the client
By default, radio NICs passively scan all RF channels and listen for beacons coming from access points in order to find a suitable access point.
When a beacon is found, the radio NIC learns a great deal about that particular network. This enables a ranking of access points based on the received signal strength of the beacon, along with capability information regarding the network. The radio NIC can then associate with the most preferable access point. After association, the station continues to scan for other beacons in case the signal from the currently-associated access point become too weak to maintain communications. As the radio NIC receives beacons from the associated access point, the radio NIC updates its local clock to maintain timing synchronization with the access point and other stations. In addition, the radio NIC will abide by any other changes, such as data rate, that the frame body of the beacon indicates. The beacons also support stations implementing power saving mode. With infrastructure networks, the access point will buffer frames destined for sleeping stations and announce which radio NICs have frames waiting through the TIM (DTIMS) that's part of the beacon


Do clients send beacon frames too??...
As apposed to beacons sent out by AP's, Clients send out "probe request" frames; It's like an opposite to a beacon, clients use a probe request packets to play there role in the 802.11 WLAN. An 802.11 probe response frame is very similar to a beacon frame, except that probe responses don't carry the TIM info and are only sent in response to a probe request. A client may send a probe request frame to trigger a probe response when the client needs to obtain information from another client on the same WLAN. A client, for instance, will broadcast a probe request when using active scanning to determine which access points are within range for possible association. Some sniffing software (e.g., NetStumbler) tools send probe requests so that access points will respond with desired info.

-Beacons are packets sent by an access point to synchronize a wireless network.

-Normal Traffic Indication Message(TIM)s that are present in every beacon are for signaling the presence of unbuffered unicast data.



DTIM Interval
The default value is 1.


Help file says..
Indicates the interval of the Delivery Traffic Indication Message (DTIM). A DTIM field is a countdown field informing clients of the next window for listening to broadcast and multicast messages. When the router has buffered broadcast or multicast messages for associated clients, it sends the next DTIM with a DTIM Interval value. Its clients hear the beacons and awaken to receive the broadcast and multicast messages.



How it works:
A Delivery Traffic Indication Message is a kind of Traffic Indication Message(TIM) which informs the clients about the presence of buffered and/or multicast/broadcast data on the access point. It is generated within the periodic beacon at a frequency specified by the DTIM Interval. After a DTIM, the access point will send the multicasted/broadcasted data on the channel following the normal channel access rules (CSMA/CA).

Acording to the 802.11 standards, a Delivery Traffic Indication Message (DTIM) period value is a number that determines how often a beacon frame includes a Delivery Traffic Indication Message, and this number is included in each beacon frame. A DTIM is included in beacon frames, according to the DTIM period, to indicate to the client devices whether the access point has buffered broadcast and/or multicast data waiting for them. Following a beacon frame that includes a DTIM, the access point will release the buffered broadcast and/or multicast data, if any exists.

Since beacon frames are sent using the mandatory 802.11 carrier sense multiple access/collision detection (CSMA/CD) algorithm, the access point must wait if a client device is sending a frame when the beacon is to be sent. As a result, the actual time between beacons may be longer than the beacon interval. Client devices that awaken from power-save mode may find that they have to wait longer than expected to receive the next beacon frame. Client devices, however, compensate for this inaccuracy by utilizing the time-stamp found within the beacon frame.

The 802.11 standards define a power-save mode for client devices. In power-save mode, a client device may choose to sleep for one or more beacon intervals waking for beacon frames that include DTIMs. When the DTIM period is 2, a client device in power-save mode will awaken to receive every other beacon frame. Upon entering power-save mode, a client device will transmit a notification to the access point, so that the access point will know how to handle unicast traffic destined for the client device. The client device will begin to sleep according to the DTIM period.




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-The higher the DTIM period, the longer a client device may sleep and therefore the more power that particular client device may potentially save.

-Client devices in wireless networks may have conflicting requirements for power consumption and communication throughput when in power-save mode. For example, laptops may require relatively high communication throughput and may have low sensitivity to power consumption. Therefore, a relatively low DTIM period, for example 1, may be suitable for laptops . However, cellphones may require relatively low communication throughput and may be operated by batteries of relatively low capacity. Therefore, a relatively high DTIM period, for example 8, may be suitable for cellphones. Further, PDA\Smart phones may require a medium to high communication throughput and may be operated by batteries of relatively low capacity. Therefore, a medium DTIM period, for example a value of 4, may be suitable for these devices.


-Currently, an access point is able to store only a single DTIM period. Consequently, different client devices in power-save mode will all wake up for the same beacon frames according to the DTIM period. Currently, a network manager may need to balance the conflicting requirements for power consumption and communication throughput when in power-save mode of client devices in different wireless networks when configuring the DTIM period of an access point. In the future an access point with support for two or more SSIDs may have SSID-dependent DTIM periods rather than a single DTIM period for all SSIDs. In other words, the network manager may configure the access point with DTIM periods on a per SSID basis. A network manager may consider the requirements of power consumption and communication throughput of client devices in a particular wireless networks when determining which DTIM period to configure for which SSID. A higher DTIM period may increase the potential savings in power consumption but may reduce the communication throughput, and vice versa



Fragmentation Threshold
Range: 256 - 2346. This value should remain at its default setting of 2346.


The Help file says..
It specifies the maximum size for a packet before data is fragmented into multiple packets. If you experience a high packet error rate, you may slightly increase the Fragmentation Threshold. Setting the Fragmentation Threshold too low may result in poor network performance. Only minor modifications of this value are recommended.




How it Works:
The Threshold for fragmentation to occur is a 802.11 configuration parameter.This is an optional feature, the 802.11 standard and dd-wrt includes the ability for access points to fragment packets for improving performance in the presence of RF interference and marginal coverage areas

To use fragmentation means to divide 802.11 frames into smaller pieces (fragments) that are sent separately to the destination. Each fragment consists of a MAC Layer header, frame check sequence (FCS), and a fragment number indicating its ordered position within the frame. Because the source transmits each fragment independently, the receiving destination replies with a separate acknowledgement for each fragmen




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-Fragmentation only applies to frames having a unicast (address assigned to a single host on your network) receiver address.

-The use of fragmentation can increase the reliability of frame transmissions. Because of sending smaller frames, collisions are much less likely to occur.

-Similar to RTS, a good method to find out if you should activate fragmentation is to monitor the wireless LAN for collisions. If you find a relatively large number of collisions, then try using fragmentation. This can improve throughput if the fragmentation threshold is set just right.

-try setting the fragmentation threshold to around 800 bytes first, then tweak it until you find the best results.

-As with any 802.11 tuning mechanisms, the goal is to improve performance.

-If what you do improves throughput, then you're doing the right thing.

-If hidden nodes are present the use of RTS and\or CTS could be a better way to reduce collisions.




RTS Threshold
Range: 0 - 2347. Default value of 2347 (bytes).


The Help file says..
The router sends Request to Send (RTS) frames to a particular receiving station and negotiates the sending of a data frame. After receiving an RTS, the wireless station responds with a Clear to Send (CTS) frame to acknowledge the right to begin transmission.


How it Works:
The RTS Threshold value is a configurable parameter within the CTS Protection mechanism. The RTS threshold is used as a trigger to engage the back and forth of RTS and CTS messages between AP and client. The triggers purpose is a type of “handshaking” approach that provides and additional layer of control over the use of the shared medium, or in the case of DD-WRT the “Radio Channel” or WLAN. If enabled, A node (client) wishing to send data initiates the process by sending a Request to Send frame (RTS).


How the RTS Threshold value works in DD-WRT.
As discussed in the CTS Protection mode section of this document, when a packet that a DD-WRT access point is transmitting is larger than the RTS threshold set in the configuration, DD-WRT will initiate the CTS Protection mode “handshaking” function. If the network packet being sent is smaller or fragmented to a size lower than the preset RTS threshold size, the CTS Protection mode mechanism will still not be enabled for that packet. Note if the packet size happens to be equal to the threshold, DD-WRT will not use CTS.


Tweak:
In DD-WRT, the default configuration after a flash sets the CTS Protection mode not to get triggered to protect transmissions by RTS. This is due to the fact that Sending RTS frames is turned off by default (threshold >=2347bytes). If the packet size the node wants to transmit is larger than the threshold, the RTS/CTS handshake gets triggered. If the packet size is equal to or less than threshold the data frame gets sent immediately.

The method for enabling RTS-CTS triggers on DD-WRT is different than with client NICs. For DD-WRT, you enable RTS-CTS handshaking triggers within WebGUI by setting a specific packet size threshold (0 - 2347 bytes) in the user configuration interface; only minor modifications are recommended.

Set this value to a 2340bytes as a start, test, then if needed try a lower value….etc…

Save. Apply. Reboot.

Rollback
Set the value back to its default value of 2347bytes and disable RTS threshold triggers in the CTS Protection mode operation on the router.

**A 30/30/30/ hard reset will also set this parameter back to the default value.




Max Associated Clients
Range: 1 - 256. Default is 128.


The Help file says..


How it Works:
This number will determine how many clients can be connected to the routers wireless LAN (WLAN)


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-



AP Isolation
The default value is Disabled.


The Help file says..
This setting isolates wireless clients so access to and from other wireless clients are stopped.


How it Works:
Wireless access points work by bridging the wireless port to the wired switch ports and router port. Everything happens at the MAC address level and does not involve IP addresses,NETBIOS over TCP/IP (also known as MS Networking). Just MAC addresses.

The wireless bridge builds a bridging table consisting of a table of "heard" (or sniffed) MAC addresses that appear on various ports. Think of the router having just 3 available ports; Wireless, Ethernet switch, and router port. If the destination MAC address of a port is shows up in the MAC address table as sitting on a specific port, only that port gets the traffic. Broadcasts, which have no destination MAC address are sent to all ports.

When this feature is enabled the software builds a logical rule (or filter) for these MAC addresses and ports that says:

"If the packet originates on the wireless port, it can only send and receive packets that are destined or originate from the router port or ethernet switch port."


Not a very complex rule, but one which totally prevents wireless client to client traffic. Not even broadcasts will go from wireless client to client.



------------------------------------------------------------------------------------------


-prevents one wireless client communicating with another wireless client.

-This breaks the connection between WLAN and WLAN

-No improvement in performance, performance is exactly the same. The difference is in "reliability" or ability to survive in a multi-path environment.

-You enable this if you are running a hotspot. Click Network Neighborhood in a motel sometime, see if the motel needs to set AP isolation.

-Changing this from the default value would be for security reasons.



TX Antenna / RX Antenna
Values are Auto, Left, Right, default value is Auto.


The Help file says..
This is used in conjunction with external antennas to give them optimum performance. On some router models left and right antennas may be reversed depending on you point of view.



How it Works:
This value determines which Antenna connection is used for the purposes of Rx and Tx functions.


------------------------------------------------------------------------------------------

-


Preamble
Values are Long and Short and Auto, default value is Long


The Help file says..
If your wireless device supports the short preamble and you are having trouble getting it to communicate with other 802.11b devices, make sure that it is set to use the long preamble.


How it Works:
The preamble is used to communicate to the receiver that data is on its way. Technically speaking, it is the first portion of the Physical Layer Convergence Protocol/Procedure (PLCP) Protocol Data Unit (PDU). The preamble allows the receiver to acquire the wireless signal and synchronize itself with the transmitter. A header is the remaining portion and contains additional information identifying the modulation scheme, transmission rate and length of time to transmit an entire data frame.



Long Preamble:

-Compatible with legacy IEEE* 802.11 systems operating at 1 and 2 Mbps (Megabits per second)
-PLCP with long preamble is transmitted at 1 Mbps regardless of transmit rate of data frames -Total
-Long Preamble transfer time is a constant at 192 usec (microseconds)

Short Preamble:

-Not compatible with legacy IEEE 802.11 systems operating at 1 and 2 Mbps
-PLCP with short preamble: Preamble is transmitted at 1 Mbps and header at 2 Mbps -
-Total Long Preamble transfer time is a constant at 96 usec (microseconds)


------------------------------------------------------------------------------------------


-Unless you have 802.11b (1 or 2Mbits/sec) client radios in your system, there's no need for a
long preamble. The default for most access points is "automatic". It only enables long preambles when associated with a 1 or 2Mbit/sec client radio.

-Most access points (AP) and broadband WiFi routers are configured for a Long Preamble or have a setting that automatically detects the preamble and adjusts accordingly. A majority of client WiFi adapters should also be pre-configured in the same manner. This is done as a precautionary measure for networks that may still employ legacy devices.



Shortslot Override
Values are Long and Short and Auto, default value is Auto

The Help file says..v
nothing.


How it Works:
Short Slot Times - The amount of time a device waits after a collision before retransmitting a packet. You can increase throughput on 802.11g, 2.4-GHz radios by enabling Shortslot override (most .11g radios enable this by default). Reducing the slot time from the standard 20 microseconds to the 9-microsecond short slot time decreases the overall backoff, which increases throughput. Backoff, which is a multiple of the slot time, is the random length of time a station waits before sending a packet on the LAN.

Many 802.11g radios support Shortslot override, but some do not. When Shortslot override is enabled, the wireless device uses the short slot time only when all clients associated to the 802.11g, 2.4-GHz radio support Shortslot override. Shortslot override is an 802.11g-only feature and does not apply to 802.11a radios.

SUMMARY: Slot times should transition from 20us to 9us when a "pure" .11g environment exists for that AP.


------------------------------------------------------------------------------------------

-


TX Power
The default value is 70 (mW) MilliWatts


The Help file says..
A safe increase of up to 70 would be suitable for most users. Higher power settings are not recommended for users due to excess heat generated by the radio chipset, which can affect the life of the router.



How it Works:
The milliwatt (symbol:mW) is equal to one thousandth (10-3) of a watt. A typical laser pointer might output 5 milliwatts.

This setting will determine the number of milliwatts used to power the radio signal output from the router.

TWEAK

wl -i eth1 txpwr 70 //will sett you adapter to 70 mW for the 5GHz
wl -i eth0 txpwr 70 //will sett you adapter to 70 mW for the 2.4GHz
wl -i eth1 txpwr1 //check transmitt power for 5 GHz
wl -i eth0 txpwr1 //check transmitt power for 2.4 GHz

------------------------------------------------------------------------------------------


-Buffalo HP units should not exceed about 30 due to their built in amp.

-Linksys ships out there units with the TX power set to 28 mW by default.

-mW \ Dbm Power Conversion Table
mW -- 1 2 3 4 5 6 8 10 12 15 20 25 30 40 50 60 80 100
DBm -1 2 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20




Afterburner
The default value is Disabled.


The Help file says..
This should only be used with WRT54GS Models and only in conjunction with other Linksys "GS" wireless clients that also support Linksys "Speedbooster" technology.

How it Works:

Just how do the Super G and Afterburner modes work?

The 125-Mbit/s Afterburner technology uses just one channel. Instead of bonding two channels of data together, it squeezes more data through a single channel by reducing overhead and aggregrating smaller packets of data into larger ones.

In particular, Super G has been criticised in the past for using so much of the Wi-Fi band that other networks in the vicinity, which normally would automatically seek out and use non-overlapping channels to avoid interference problems, could be severely impacted.

By contrast, Super G gets part of its speed increase from "bonding" data from two non-overlapping wireless channels together (normal Wi-Fi uses only 1 out of the 11 channels in the 2.4-GHz range). This channel bonding, though, increases the potential for troublesome interference with microwave ovens, with cell phones and with other Wi-Fi networks (see our feature comparing the different speed boost technologies).

Check if Your Router Supports Afterburner
1.Connect to your router using telnet or ssh. Telnet/SSH and the Command Line
2.Type wl cap and press enter. It will return a list of capabilities.
3.If afterburner is listed you may enable Afterburner on the Advanced Settings tab under Wireless in DD-WRT.


TWEAK

You would enable this feature when you are tring to get all the proformance out of your 2.4GHz network running 802.11g mode or better only and you would only enable Afterburner when your hardware supports afterburner and your enviroment meets the requirements as well.

To set afterburner from the CMD enter the follwoing commands;

wl set wl0_afterburner=on

wl set wl_afterburner=on



------------------------------------------------------------------------------------------

-This speed-enhancing feature is available on all DD-WRT enabled G routers. It is hardware independent. Afterburner will only improve speeds when used with clients that also have the Speedbooster/Afterburner feature; use with "normal" 802.11g clients will actually lower performance.

-Afterburner can be used in networks that also have 802.11b devices, and will not disable the use of them.

-Afterburner can help in environments dense with wireless signals.

-Many MiniPCI cards built into notebooks and many PC Cards are based on Broadcom chips whose configurations support Afterburner

-In order to enjoy the benefits of Afterburner a.k.a. SpeedBooster, all clients and the AP must support afterburner.

-About 33 percent faster in real world file transfer test than basic 802.11g mode equipment

-Afterburner is also known as:

SpeedBooster
SuperSpeed
Turbo G 125mbps
125HSM
125* High Speed
G Plus


Afterburner is not:
Super-G / 108 mbps (Super-G is an Atheros technology)
XPress Technology is Dell's version of Frame Bursting, not Afterburner.



Bluetooth Coexistence Mode
Values are Enable and Disable and Preemption,The default value is Disabled.

The Help file says..


How it Works:


------------------------------------------------------------------------------------------

-I have had problems with bluetooth transfers (big big transfers), with this enabled, the problem has been solved.



Wireless GUI Access
The default value is Enabled.

Help file says..
The setting allows access to the routers setup (GUI) from wireless clients. Disable this if you wish to block all wireless clients from accessing the setup pages.

How it works:


-------------------------------------------------------------------------------------------------------


-Once you have your dd-wrt configured you can enable this setting and no wireless clients will be able to access the routers dd-wrt GUI.

-Wireless clients can still access the router over telnet and ssh when this setting is disabled.

-Changing this from the default value would be for security reasons.


Wireless Network Mode
Default Value: Mixed


Help file says..

How it works:
In Mixed mode, DD-wrt routers are able to offer various wifi network types (B, G and N) at the same time from a single 2.4GHz radio. 802.11n transmission is always embedded in an 802.11a, for 5GHz radios, or 802.11g for 2.4GHz radio transmissions. This is called Mixed Mode Format protection (also known as L-SIG TXOP Protection).



Wireless Channel
Default values are Channel Selection is 6, and channel width is 20MHz.


Help File says....
Select the appropriate channel from the list provided to correspond with your network settings (in North America between channel 1 and 11, in Europe 1 and 13, in Japan all 14 channels). All devices in your wireless network must use the same channel in order to function correctly. Try to avoid conflicts with other wireless networks by choosing a channel where the upper and lower three channels are not in use.


How it works...
IEEE 802.11 is a set of standards that are published for the purposes of carrying out wireless local area network (WLAN) computer communication in the 2.4, 3.6 and 5 GHz frequency bands. They are implemented by the IEEE LAN/MAN Standards Committee ( aka "IEEE 802").


2.4GHz Channels
2.4GHz band in the 802.11 standard uses radio frequencies in the range of 2.412-2.484 GHz. 802.11 splits up the frequencies within the band into 14 radio channels, numbered 1-14. These are the 14 channels designated in the 2.4 GHz range spaced 5 MHz apart (with the exception of a 12 MHz spacing before Channel 14). The frequency range of a channel partially overlaps with the next one, so not all the channels are therefore independent. By default on a 2.4GHz band radio DD-WRT routers, channels 1, 6 and 11 have no overlap with each other; those three channels are known in the wireless community as the "standard" for wireless channel independence within the 2.4GHz band.

In North America this 2.4GHz "band" is implemented by dividing the 2.4GHz band into 13 channels each with a width of 22 MHz but also spaced only 5 MHz apart, with channel 1 centred on 2412 MHz and 13 on 2472, to which Japan adds a 14th channel 12 MHz above channel 13.

5GHz Channels

5GHz band in the 802.11 standard uses radio frequencies in the range of 4.980 GHz to 5.825 GHz. 802.11 splits up the frequencies within the band into 42 wireless radio channels, numbered 7 to 196. These are the 42 channels designated in the 5 GHz range and they are spaced 5 MHz apart. The frequency range of a channel partially overlaps with the next one, so not all the channels are therefore independent but unlike the 2.4GHz band the 5GHz band offers many more non overlapping channels.

In North America this 5GHz "band" is implemented by dividing the 5GHz band into 24 channels (36 to 165) each with a width of 22 MHz but also spaced only 5 MHz apart, with channel 36 centred on 5.180 GHz and 165 on 5.825 GHz.



**NOTE - The specifics of the frequency range and how channels are allocated is regulated by each country. Usually constrained in part by how each country allocates radio spectrum to various services. For example, in the 2.4Ghz band Japan has implemented 1 to 14 wireless channels, Europe #1-#13 and the FCC in the US decided with 1 to 11 wireless channels all within the same band. DD-WRT allows the use of all channels; this doesn't mean your client wireless adapter can support channels outside of its licensed region.


How it works in DD-WRT:
To configure your radio channels in the WebGUI you browse to the "Basic Settings" under the "Wireless" page on your DD-WRT router.

If you have dual band router (ie. Two Radios inside the router) you will see two sections for configurations listed in this page with the headings as "wl0" for the 2.4GHz radio and "wl1" for the 5GHz radio.

DD-WRT has channel configuration settings that must be configured;

Wireless mode, this determines if the router will be used as an Access Point, Repeater, Client or in an Ad-hoc configuration mode. Channel options are only avalaible to a router running in AP or Ad-Hoc wireless mode.

Wireless Network mode, this setting determines what wireless protocols will be offered to the wireless clients that try to connect to the router. Depending on the wireless network mode your radio is configured for DD-WRT will have additional channel options for you to configure if you choose.

Channel Width
A feature of DD-WRT is the Channel Width value(10Mhz, 20MHz or 40MHz). It allows a user to decide if DD-WRT will force the use of narrow, standard or wide channel use of the 2.4GHz band.

10Mhz - Narrow channel - (more non overlapping channels but less bandwidth)

20Mhz - Default DD-WRT configuration for the 2.4GHz band.

40Mhz - Wide channel - (less non overlapping channels but more bandwidth)
-If 40MHz is selected as the channel width the wireless channel will be bonded with another ajacent channel to provide more preformance. The channel the router uses to bond to the orgional wireless channel selection is known as the "wide channel". The orgional wireless channel selection bonds with either a channel above or below itself. DD-WRT uses the "Wide Channel" value to give the admin the option to select the upper or lower channel in refence to the main channel selection.




For an example of the channel options lets exmine DD-WRT running on "Linksys WRT610n" hardware which happens to be a 802.11n Dual-Band Router.


wl0 radio ( 2.4GHz band )


802.11b/g and n and mixed modes of all three are offered by DD-WRT running on top of 802.11n hardware , no matter which mode is selected the 2.4GHz band radio can only use radio frequencies in the range of 2412-2484 MHz (channels 1 to 14);

Wireless Mode: AP
Wireless Network Mode: B-Only, G-Only and BG-Mixed


DD-WRT channel options when configured in the wireless modes above:

1) - Channel Selection
Channel selections offered by DD-WRT are 1 to 14 or the DD-WRT "Auto" channel selection feature.

Wireless Mode: AP
Wireless Network Mode: N-Only and Mixed

DD-WRT channel options when configured in the wireless modes above:

1) - Wireless Channel Selection
Channel selections offered by DD-WRT are 1 to 14 or the DD-WRT "Auto" channel selection feature.

2) - Wireless Channel Width
"Auto" can be selected as well to use the DD-WRT of automatic selection of wireless channel width. As a note if "Auto" is selected for the wireless channel width the wireless channel selection will be reset to use the "Auto" feature when you click save.

3) - Wide Channel selection.
DD-WRT uses the "Wide Channel" value to give the admin the option to select the upper or lower channel in refence to the main wireless channel selection.


***NOTE - If 40MHz is selected as the channel width value in mixed mode wireless network configuration the use of CTS protection mode must enabled. This feature provides a mechonism for 802.11g clients to be able to connect and operate correctly on the same 2.4GHz radio.



wl1 radio ( 5GHz band )


802.11a, n and mixed modes of both are offered by DD-WRT running on top of 802.11n hardware , no matter which mode is selected the 5GHz band radio can only use radio frequencies in the range of 5.170GHz to 6.080GHz (channels 34 - 216).

Wireless Mode: AP
Wireless Network Mode: A-Only

DD-WRT channel options when configured in the wireless modes above:

1) - Channel Selection
Channel selections offered by DD-WRT are 34 to 216 or the DD-WRT "Auto" wireless channel selection feature.



Wireless Mode: AP
Wireless Network Mode: N-Only and NA-Only

DD-WRT channel options when configured in the wireless modes above:

1) - Wireless Channel Selection
Channel selections offered by DD-WRT are 34 to 216 or the DD-WRT "Auto" wireless channel selection feature.

2) - Wireless Channel Width
"Auto" can be selected as well to use the DD-WRT of automatic selection of wireless channel width. As a note if "Auto" is selected for the wireless channel width the wireless channel selection will be reset to use the "Auto" feature when you click save.

3) - Wide Channel selection.
DD-WRT uses the "Wide Channel" value to give the admin the option to select the upper or lower channel in refence to the main wireless channel selection.

***NOTE - If 40MHz is selected as the channel width value in mixed mode wireless network configuration the use of CTS protection mode must enabled. This feature provides a mechonism for 802.11a clients to be able to connect and operate correctly on the same 5GHz radio.



-------------------------------------------------------------------------------------------------------

-If you want to introduce channel bonding in your wireless enviroment you should also start with "CTS Protection" set to Auto as well.



Sensitivity Range (ACK Timing)
Default Value: 2000 meters


Help file says..
Adjusts the ack timing in Atheros typical way based on the maximum distance in meters .A value of 0 disables ack timing completely for broadcom firmwares. On Atheros based firmwares a value of 0 will turn into auto ack timing mode



How it works:
1.) AP sends a message: Everybody wait X time for a response
2.) Client receives
3.) Client sends a response to the AP called and ACK - Acknowledges the command waiting for X time.
4.) AP sees the ACK
5.) Other Clients and AP are free to send


-------------------------------------------------------------------------------------------------------


-Ack timing adjustment is used for distance links when the time needed to tramit is greater then than the amount of time the sender waits before retrying to transmit the same packet again.


-You want to set the ack timing to 2x the distance between bridged routers measured in meters.


-If the ACK timing is too high it will not affect the throughput that much. If the ACK time is too low it can drop your throughput to the point of being unusable and can even make the system not connect.


-Recommended setting is to 0 for a household network. Which for linksys users means dd-wrt doesn't use ACK timing at all.

-Maximum theororetical ACK timeouts (not sure on thouroughness) 802.11a : 409us ~ 61km 802.11b : 744us ~ 111km 802.11g : 372us ~ 55km

_________________
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Last edited by stephensuley on Wed Apr 28, 2010 0:45; edited 46 times in total
Donny
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PostPosted: Sun Apr 26, 2009 23:34    Post subject: Reply with quote
Here is what I believe to be on track. Others please feel free to correct any of this:

Shared key seems to cause more problems than it solves. This should be left to auto with current builds.

Basic rate should also be set to auto. Setting it to a specific value can cause connection loss if the connection rate can't be maintained due to noise, for example. Some people think that if they set it to a high value, it will force the router to stay at that high value, but it can't if the quality of the connection is not there.

CTS Protection - There were a number of threads a while ago that suggested that people had increased speed if this was disabled.

Frameburst - This is for the few routers that supported it or its equivalent, I understand. Most should have it disabled.

Beacon interval is, as I understand it, a kind of a refresh timing that is needed to maintain a connection with some hardware? Seems to me it is useful for things like wireless cameras.

AP isolation. This breaks the connection between LAN and WLAN, or is it LAN and WAN, or is it LAN and WLAN and WAN?

Antenna - You can set dd-wrt to use one antenna or the other, or both. Both is usually preferred as the router can then use the antenna that works best. Right is right when looking at it from the front...on SOME routers.

Preamble - Is the little code that is sent by the router at the commencement of a packet. It can be long or short or auto. I have read that long is preferable, but don't know why. You want devices to have the same premamble.

Afterburner - Again, I believe that this is hardware related. If you don't have hardware that supports this, you don't need this.

Wireless GUI - This enables you to get to the dd-wrt webgui. Some would find this important. Disabling it would be for security reasons.

Ack Timing - Ah yes. Ack timing. Ack timing is used for distance links. You want to set the ack timing to 2x the distance between bridged routers measured in meters. Thus, the default is for 1 km. Probably more than you need. I have monkeyed with this setting quite a bit, including using it with a 1km link. I have never found that changing it makes one bit of difference. Recommended setting is to 0 for a household network, however.

That's a start. Hopefully those with more knowledge than me will step in and correct all the errors in my understanding. Laughing

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hfelsh
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Posts: 190

PostPosted: Mon Apr 27, 2009 0:15    Post subject: Reply with quote
Donny wrote:
...Ack Timing - Ah yes. Ack timing. Ack timing is used for distance links. You want to set the ack timing to 2x the distance between bridged routers measured in meters. Thus, the default is for 1 km. Probably more than you need. I have monkeyed with this setting quite a bit, including using it with a 1km link. I have never found that changing it makes one bit of difference. Recommended setting is to 0 for a household network, however.
Why 0? Just curious what your reasons for that would be, if changing the value doesn't appear to do anything?
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PostPosted: Mon Apr 27, 2009 0:29    Post subject: Reply with quote
hfelsh wrote:
Why 0? Just curious what your reasons for that would be, if changing the value doesn't appear to do anything?


The recommendation that I have seen for situations with normal antennas is to set it to 0. That makes sense and will do no harm. However, my personal experience is that I have not found that adjusting the ack timing changes anything in my long distance link.

If I am correct on this, you should still set it according to the math (although it might not do anything). If I am wrong about this, then you should still set it according to the math (as it will do something). Your behaviour should not change just because it might not do anything. Safe course of action is still to set it properly.

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ad5mb
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Posts: 386

PostPosted: Mon Apr 27, 2009 1:08    Post subject: Reply with quote
Quote:
-This breaks the connection between LAN and WLAN, or is it LAN and WAN, or is it LAN and WLAN and WAN?


it breaks connection between WLAN and WLAN

Quote:
-no improvement in performance, performance is exactly the same. The difference is in "reliability" or ability to survive in a multi-path environment.


You enable this if you are running a hotspot. So the sales rep for Spacely Sprockets does not get the chance to snoop around in the sales rep for Cogswell Cogs laptop. Click Network Neighborhood in a motel sometime, see if the motel needs to set AP isolation.

Beacon interval is... how often the SSID is broadcast

CTS Protection is for testing purposes. If one client on the fringe of the network can't hear another client on the opposite fringe of the network, they can both broadcast at the same time. CTS forces all routers to wait until they get permission - Clear To Send. If CTS makes things faster you need to redesign your network to eliminate contention.

ACK timing...

Normal use:
    AP sends. AP includes message: Everybody wait X time for a response
    Client receives
    Client Acknowledges
    AP sees the ACK
    Other Clients and AP are free to send


Long link: Incorrect ACK timing
    AP sends. AP includes message: Everybody wait X time for a response.
    Client receives
    Client Acknowledges. But it takes longer than X to acknowledge.
    Other Clients and AP are free to send. Client is trying to send ACK, but it collides with other traffic.
    AP resends the original packet, believing that Client didn't get it, because AP didn't get ACK


Long link: Correct ACK timing
    AP sends. AP includes message: Everybody wait Y time for a response.
    Client receives
    Client Acknowledges. within Y time. The time it takes for the Client to inspect the packet, verify integrity with a checksum, compose an ACK message and send. Radio waves take 6.17 microseconds to go one mile.
    AP gets ACK
    Other Clients and AP are free to send.

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stephensuley
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PostPosted: Mon Apr 27, 2009 1:30    Post subject: Reply with quote
Thanks to donny and ad5mb..

As I add\update the sections I will add your input to the guide.

Thanks again and keep it coming Smile

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PostPosted: Mon Apr 27, 2009 1:37    Post subject: Reply with quote
Thanks to ad5mb for the corrections and additions. I think it would also be useful to understand when to alter the settings. For example...when should beacon interval be increased or decreased? Should it ever be set to 0?

DTIM interval and fragmentation threshold...perhaps someone has some input? I have no idea about these.

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stephensuley
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PostPosted: Mon Apr 27, 2009 2:24    Post subject: Reply with quote
When I was working out a way to determine if a router supports 802.11e "Frame Burst" the "wl cap" command doesn't list it, can someone perhaps talk about the output from my 610n?


root@610n-01:~# wl cap
ap sta wet led wme pio 802.11d 802.11h rm cqa mbss16 afterburner ampdu amsdurx amsdutx


That would help too.

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ad5mb
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PostPosted: Mon Apr 27, 2009 2:30    Post subject: Reply with quote
Fragmentation threshold:

http://www.wi-fiplanet.com/tutorials/article.php/1468331

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stephensuley
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PostPosted: Mon Apr 27, 2009 16:16    Post subject: Reply with quote
Donny wrote:
Thanks to ad5mb for the corrections and additions. I think it would also be useful to understand when to alter the settings. For example...when should beacon interval be increased or decreased? Should it ever be set to 0?

DTIM interval and fragmentation threshold...perhaps someone has some input? I have no idea about these.


Donny, I just added DTIM to the settings guide.....let me know what you think....I'm starting to put together fragmentation now...

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PostPosted: Mon Apr 27, 2009 16:25    Post subject: Reply with quote
stephensuley wrote:

TX Power
This value ranges from 1 - 251 mw, default value is 28mw. A safe increase of up to 70 would be suitable for most users.



FYI... on my WRT54Gx series devices, the default value for DD-WRT seems to be preset at 70mw.

I make it a habit to reduce this value to 40mw, and then tweak from there if desired.

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Donny
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PostPosted: Mon Apr 27, 2009 16:34    Post subject: Reply with quote
hpsenicka wrote:
stephensuley wrote:

TX Power
This value ranges from 1 - 251 mw, default value is 28mw. A safe increase of up to 70 would be suitable for most users.



FYI... on my WRT54Gx series devices, the default value for DD-WRT seems to be preset at 70mw.

I make it a habit to reduce this value to 40mw, and then tweak from there if desired.


Should also note that Buffalo HP units should not exceed about 30 due to their built in amp.

Be sure to focus on what the user should do, not what the settings do. Wink I find that the little tabs are the most useful info, but not all of the headings have them.

BTW, if you set authentification key to shared, from auto, and are connected wirelessly and your computer doesn't support shared, you will lose all internet access and access to the webgui and you will have to connect with a wire to change it back to auto(but you don't actually have to do a hard reset to get it back to defaults to fix this......ask me how I know. Embarassed )

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http://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486
stephensuley
DD-WRT User


Joined: 09 Feb 2008
Posts: 421
Location: Canada

PostPosted: Mon Apr 27, 2009 16:51    Post subject: Reply with quote
Donny wrote:
hpsenicka wrote:
stephensuley wrote:

TX Power
This value ranges from 1 - 251 mw, default value is 28mw. A safe increase of up to 70 would be suitable for most users.



FYI... on my WRT54Gx series devices, the default value for DD-WRT seems to be preset at 70mw.

I make it a habit to reduce this value to 40mw, and then tweak from there if desired.


Should also note that Buffalo HP units should not exceed about 30 due to their built in amp.

Be sure to focus on what the user should do, not what the settings do. Wink I find that the little tabs are the most useful info, but not all of the headings have them.

BTW, if you set authentification key to shared, from auto, and are connected wirelessly and your computer doesn't support shared, you will lose all internet access and access to the webgui and you will have to connect with a wire to change it back to auto(but you don't actually have to do a hard reset to get it back to defaults to fix this......ask me how I know. Embarassed )


Thanks for the contribution....all updated.

Donny I'll put the buffalo amp note in the TX power section when I get to it...

thanks

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