Posted: Tue Feb 12, 2013 3:23 Post subject: TX Power
Hello,
The TX Power in my dd-wrt shows the value 70. Is it a safe value? I want the wireless only within 10 meters. So what is the best value ? (considering good performance and safety for my router WRT54G V8 )
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Tue Feb 12, 2013 3:47 Post subject:
Thats fine, try 50 or 40 if you want less range but theres also hiding SSID/MAC filtering/strict DHCP settings etc that are also effective as less TX power may mean less throughput at the same working range even though SNR is still good. _________________ LATEST FIRMWARE(S)
BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers
theres also hiding SSID/MAC filtering/strict DHCP settings etc that are also effective
If I disable SSID broadcast, even I won't be able to connect. So I have enabled it always. I am using MAC Filtering. I don't know what is "strict DHCP".
Quote:
as less TX power may mean less throughput at the same working range even though SNR is still good.
I don't understand what you mean exactly. I thought of reducing the TX Power, as the use of wireless is only within my office rooms. I don't use it for long distance. There is no such need at all.
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Tue Feb 12, 2013 4:48 Post subject:
joscollin wrote:
tatsuya46 wrote:
theres also hiding SSID/MAC filtering/strict DHCP settings etc that are also effective
If I disable SSID broadcast, even I won't be able to connect. So I have enabled it always. I am using MAC Filtering. I don't know what is "strict DHCP".
Quote:
as less TX power may mean less throughput at the same working range even though SNR is still good.
I don't understand what you mean exactly. I thought of reducing the TX Power, as the use of wireless is only within my office rooms. I don't use it for long distance. There is no such need at all.
With SSID broadcast off all devices that know the SSID still connect, it will just appear as [hidden] to unknown devices, you have to manually input the SSID to the client.
If client A is 20ft from the router with a SNR of 50, say dropping TX power reduced SNR to 45, both are still good but the max throughput may drop as well lets say 25Mbps becomes 21Mbps for ex.
"Strict DHCP" is setting max DHCP users to 0, therefor only static leases go out, even if you were to have wifi encryption off & SSID broadcast on & stranger connects, that user will not get a DHCP lease = no IP from router = no internet. _________________ LATEST FIRMWARE(S)
BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers
With SSID broadcast off all devices that know the SSID still connect, it will just appear as [hidden] to unknown devices, you have to manually input the SSID to the client.
I have to experiment on this. Once I did and it was a failure.
Quote:
If client A is 20ft from the router with a SNR of 50, say dropping TX power reduced SNR to 45, both are still good but the max throughput may drop as well lets say 25Mbps becomes 21Mbps for ex.
So reducing the TX Power will reduce the internet speed also. Am I correct?
Quote:
"Strict DHCP" is setting max DHCP users to 0, therefor only static leases go out, even if you were to have wifi encryption off & SSID broadcast on & stranger connects, that user will not get a DHCP lease = no IP from router = no internet.
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Tue Feb 12, 2013 7:16 Post subject:
joscollin wrote:
So reducing the TX Power will reduce the internet speed also. Am I correct?
Only in a scenario when your line is faster than the max possible speed of your wifi, such as 802.11g maxing at about 26Mbps at absolute best, if you have a 30, 50Mbps etc line, wifi clients will never get that speed unless 802.11n is used. _________________ LATEST FIRMWARE(S)
BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers
So reducing the TX Power will reduce the internet speed also. Am I correct?
Only in a scenario when your line is faster than the max possible speed of your wifi, such as 802.11g maxing at about 26Mbps at absolute best, if you have a 30, 50Mbps etc line, wifi clients will never get that speed unless 802.11n is used.
I am using an internet connection of 4Mbps download speed. On the top of my Linksys WRT54G, it is written 2.4GHz and 54Mbps. Could you please suggest based on this information ?
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Tue Feb 12, 2013 9:38 Post subject:
As you reduce TX power try to keep all clients' SNR at 12 minimum should be sufficient to get full 4Mbps throughput. _________________ LATEST FIRMWARE(S)
BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers
"Strict DHCP" is setting max DHCP users to 0, therefor only static leases go out, even if you were to have wifi encryption off & SSID broadcast on & stranger connects, that user will not get a DHCP lease = no IP from router = no internet.
The user will not be able to get an IP from the router. But he will be able to connect by assigning an IP statically and then access the internet.
I have set /etc/network/interfaces in my laptop as follows and it connects, even if I haven't assign a static lease for eth1.
iface eth1 inet static
address 192.168.1.100
netmask 255.255.255.0
gateway 192.168.1.2
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Thu Feb 14, 2013 7:15 Post subject:
Partly why you should move off the overused 192.168.x.x subnet and move to something in the 10.x.x.x subnet, they'll be guessing all day. Same as SSID broadcast off, they CAN guess it if they care to waste a long time, and cracking WPA2 AES taking even longer, and then MAC filtering.. stick all those together I don't think anyone is getting in unless they want to grow a beard 10 times over. _________________ LATEST FIRMWARE(S)
BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers
Partly why you should move off the overused 192.168.x.x subnet and move to something in the 10.x.x.x subnet, they'll be guessing all day. Same as SSID broadcast off, they CAN guess it if they care to waste a long time, and cracking WPA2 AES taking even longer, and then MAC filtering.. stick all those together I don't think anyone is getting in unless they want to grow a beard 10 times over.
They don't have to guess at all. They can assign some IP to eth1 and use iwconfig to connect to the internet, provided SSID broadcast is enabled.
I checked with wired connections and static leases work perfectly with wired connections. (It is rejecting the IPs not listed inside the router.) But not with wireless.