TL-WR841N v9.0

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drk
DD-WRT Novice


Joined: 19 Mar 2015
Posts: 23

PostPosted: Sat Oct 21, 2017 17:29    Post subject: Reply with quote
numerci wrote:
If you want to be protected then this needs to be enabled (on). There could be devices that have issues to connect but it was not may case... all my devices connected without problems.

Got it.
Doing 90 MBit P2P test download.
Approx. 1.5-3 MB memory free. Seems (not sure) it's significantly less than I had with 27506.
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danielwritesback
DD-WRT User


Joined: 29 Aug 2011
Posts: 240

PostPosted: Mon Oct 23, 2017 8:18    Post subject: 33555 Reply with quote
Switched to 33555 today, for the security update.
"undefined" it said. But the fix is simple. Had to write down my settings, load factory defaults, and then put my settings back in.
After that, it works well (so far).
40% free memory, 1% cpu load,
flakie
DD-WRT User


Joined: 23 Sep 2017
Posts: 229
Location: Swindon, UK

PostPosted: Mon Oct 23, 2017 9:59    Post subject: Re: 33555 Reply with quote
danielwritesback wrote:
Switched to 33555 today, for the security update.
"undefined" it said. But the fix is simple. Had to write down my settings, load factory defaults, and then put my settings back in.
After that, it works well (so far).
40% free memory, 1% cpu load,


Just making a backup of settings fixes the undefined bug. No need to wipe settings.

_________________
Router Model: Netgear R8000
Firmware: DD-WRT v3.0-r41813 std (12/29/19)
Modem: Super Hub 3.0
ISP: Virgin Media 350/35 Mbps

danielwritesback
DD-WRT User


Joined: 29 Aug 2011
Posts: 240

PostPosted: Thu Oct 26, 2017 5:20    Post subject: Reply with quote
Did anyone else notice slower wifi throughput with 33555?
Seems like 33006 hauled files faster.
drk
DD-WRT Novice


Joined: 19 Mar 2015
Posts: 23

PostPosted: Thu Oct 26, 2017 16:51    Post subject: Reply with quote
danielwritesback wrote:
Did anyone else notice slower wifi throughput with 33555?
Seems like 33006 hauled files faster.


Never used 33006.
Can compare with good old 27506 only, which was fast and reliable for me.
The same high wi-fi throughput.
danielwritesback
DD-WRT User


Joined: 29 Aug 2011
Posts: 240

PostPosted: Fri Oct 27, 2017 6:05    Post subject: Reply with quote
drk wrote:
Never used 33006. Can compare with good old 27506 only, which was fast and reliable for me. The same high wi-fi throughput.

Thanks!!!

Edit:
What happened is that windows update for wpa2 krack had made windows less compatible with the dd-wrt krack patch. Functionality was restored by turning off the redundant dd-wrt krack patch. After all, it is a client issue, not a router issue.


Last edited by danielwritesback on Wed Jul 25, 2018 22:02; edited 5 times in total
fixni
DD-WRT Novice


Joined: 27 Oct 2017
Posts: 1

PostPosted: Fri Oct 27, 2017 8:20    Post subject: Reply with quote
Hello.

So which firmware is best? we need voting poll or something :P Im routing on r31899 without any problem and newer firmwares (like drk mentioned) have more requirements for memory which make router less stable.

Will be newer firmwares still usable? because we hitting HW limits of this device 4/32MB. Official LEDE (not mod) firmware not supporting devices with these parameters :(

thx
danielwritesback
DD-WRT User


Joined: 29 Aug 2011
Posts: 240

PostPosted: Sun Nov 19, 2017 18:53    Post subject: Make it pretend to be a faster model? Reply with quote
Startup script
Code:

echo 1000 > /proc/sys/net/core/netdev_max_backlog
nvram set et_dispatch_mode=1
echo 30 > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout
echo 60 > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout_stream
swconfig dev switch0 set enable_vlan 1
swconfig dev switch0 set apply


The first 4 lines are WAN speedup, for use with fast ISP connections. The 1000 can go as low as 360, if needed. The last 2 lines are a patch to make the 4 port switch work normally with newer versions of DD-WRT.

Did I miss anything?

P.S.
However, I did not find out how to correct the severe under-utilization of the 750MHz CPU design (max is 800MHz) and the DDR400 memory chip as well. It is noticeable that the v9 runs at 550MHz and the v11 runs at 650MHz, with the same CPU. Is the difference from lower voltage (thermal) or is it from product differentiation (marketing)?
matty8199
DD-WRT Novice


Joined: 07 Sep 2009
Posts: 40

PostPosted: Mon Dec 04, 2017 18:31    Post subject: Reply with quote
hoping someone can help me with this problem, it's getting really frustrating...

lately on my wr841 v9 i've been having issues with wifi - i have wan disabled and am only using this as a wireless access point. it's in my guest room near my front door proving wifi to the front yard and front of the house...i've also added a separate SSID to allow my ring doorbell to connect only to that AP and not have to worry about it trying to bounce around to the other two AP on my main network (and end up dropping the connection because the signal isn't as strong).

randomly, i'll have the AP allow connections but i'll notice my doorbell has gone offline. if i check my phone and see that it is connected to the wr841 when this happens, my internet speed is at a crawl if i can access anything at all (lots of timeouts). whenever this happens a reboot fixes the problem for a while, but it always ends up coming back.

this all started about two months ago (sadly i can't remember what version i was on at the time). over the last few weeks i've gone to 33772 (trying to make sure i have the krack patch installed), this didn't help...same issue. today i installed 33986 hoping that'll help, but i've only had it running for about 20 minutes so far.

now that i think about it, the issues probably started around when i created the second SSID for my doorbell. is there a known issue as far as multiple SSID goes? if not, any ideas where i can look to try to fix this? there doesn't seem to be any rhyme or reason as to when it happens...sometimes i'll go days without issue, this morning my wifi went down after only being up after reboot for a few hours.
skrug
DD-WRT Novice


Joined: 12 Mar 2018
Posts: 4

PostPosted: Tue Mar 13, 2018 16:29    Post subject: TL-841ND v9 setup as "wireless switch"? Reply with quote
Hi there,

I have a TL-841ND v9 on ver 34777. Which seems pretty much the same as previous versions I've tested.

Anyways, I need to set one of these up so that any client connecting via wifi would see this router as a dumb switch. I am okay with losing the ability to manage it.

This is for use with an IPTV network where I have a wireless set top box that needs to communicate layer 2 through the router out to the IPTV uplink. I want the ARP from a wifi client to be forwarded straight out the ethernet port to my IPTV uplink so that the IPTV uplink only sees my set top boxes (wired or wireless).

Can this happen? I would definately appreciate any help!
jmfolcik
DD-WRT User


Joined: 06 Nov 2010
Posts: 125

PostPosted: Mon Apr 23, 2018 23:42    Post subject: Reply with quote
I managed to tune this router to perform well at both "ends", just not all the way from wan to wifi.

I can get 100megabit download on some speedtests, not all but some if I pick a specific server and only when wired.
I can get 100megabit lan to wifi SMB copies
I cannot get 100megabit wan to wifi, max is around 60

I believe this is due to NAT and Wifi requiring each more than 50% of the available cpu to do their jobs at 100megabit.

Anyone gotten it to work better?

My notable settings:
40mhz channel 6
network set to N-Only (NG Mixed had significantly lower speed)
short preamble and short gi
wpa2 aes
spi firewall disabled
SFE Enabled

running build 35767
danielwritesback
DD-WRT User


Joined: 29 Aug 2011
Posts: 240

PostPosted: Sun May 20, 2018 19:52    Post subject: Reply with quote
jmfolcik wrote:
...100megabit wan...

In the startup, change to high speed mode:

nvram set et_dispatch_mode=1

Also investigate wifi settings like frame-burst and fairness. Possibly, conflict between the dd-wrt krack patch and client OS krack patch, if Both used, may limit speed.
tatsuya46
DD-WRT Guru


Joined: 03 Jan 2010
Posts: 7568
Location: YWG, Canada

PostPosted: Sun May 20, 2018 20:11    Post subject: Reply with quote
jmfolcik wrote:
I believe this is due to NAT and Wifi requiring each more than 50% of the available cpu to do their jobs at 100megabit.


that is why, new router needed... interrupts are fat

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jmfolcik
DD-WRT User


Joined: 06 Nov 2010
Posts: 125

PostPosted: Sun May 20, 2018 23:59    Post subject: Reply with quote
I put that in the startup and restarted, so now I have this there:

echo 1000 > /proc/sys/net/core/netdev_max_backlog
nvram set et_dispatch_mode=1
echo 30 > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout
echo 60 > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout_stream
swconfig dev eth0 set enable_vlan 1
swconfig dev eth0 set apply

No change in download speeds, I have SFE enabled, I did more testing this weekend and SFE only gives me about 5% improvement. I think perhaps some of those settings are old and dont change things perhaps on the newer builds. I'm on 35898. I can see that sfe is loaded, but says used by 0?? Is that normal?

# lsmod
Module Size Used by
nf_nat_pptp 1344 0
nf_conntrack_pptp 3120 1 nf_nat_pptp
nf_nat_proto_gre 784 1 nf_nat_pptp
nf_conntrack_proto_gre 2416 1 nf_conntrack_pptp
nf_nat_h323 4256 0
nf_conntrack_h323 33984 1 nf_nat_h323
shortcut_fe 87472 0
ath9k 440096 0
ath 13904 1 ath9k
mac80211 557632 2 ath9k,ath
compat 13120 2 ath9k,mac80211
ag71xx 18032 0
danielwritesback
DD-WRT User


Joined: 29 Aug 2011
Posts: 240

PostPosted: Mon May 21, 2018 0:35    Post subject: Reply with quote
jmfolcik wrote:
I put that in the startup and restarted, so now I have this there:

echo 1000 > /proc/sys/net/core/netdev_max_backlog
nvram set et_dispatch_mode=1
echo 30 > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout
echo 60 > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout_stream
swconfig dev eth0 set enable_vlan 1
swconfig dev eth0 set apply

Try cutting that list down to only:
nvram set et_dispatch_mode=1

And, have only 2 total ethernet cords plugged in:
Input from cable modem
Output to gigabit switch

So, cut-through-forwarding, spi off, upnp off, and only 1 client (can be 1 pc or an external switch), are the test conditions where this hardware should meet specs.

If that isn't working, try 33006 for its wifi speed.
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