Unfortunately, I can't reproduce problem.

Several customers has problem with adapters based on Atheros AR9285. It was 
solved by installing latest Atheros drivers.
Which Wi-Fi adapter you are using?

The adapter uses a Ralink RT3070 chipset

I experienced something similar.
The slowness caused by the weak signal strength.
Nothing to do with the driver of the client card, I experienced this phenomenon 
with three different chipset.
It is not necessary to reboot the router, the "wl down" and "wl up" commands do 
the repair. After these commands the signal strength ok for a while.

jmerthj:

Are you use WPA2/PSK/AES like issue creator? Can you provide "wl status" output 
in both cases - when signal is ok & not?

Seems to be problem is in new Broadcom SDK 5.60. Unfortunately there is no wl 
driver sources in public access, so we will try to upgrade to newer Broadcom 
SDK 5.100. It will take some time.

We can't rollback to old Broadcom SDK 5.10 due it don't support RT-N10U, 
RT-N12B1 & newer devices.

I am using WPA2/PSK/AES too.

Here is the output of the "wl status" command when the signal is weak (RSSI = 
-70 dBm at the client adapter):

SSID: "xxxxxxxx"
Mode: Managed   RSSI: 0 dBm SNR: 0 dB   noise: -83 dBm  Channel: 12
BSSID: xx:xx:xx:xx:xx:xx    Capability: ESS ShortSlot 
Supported Rates: [ 1(b) 2(b) 5.5(b) 6(b) 9 11(b) 12(b) 18 24(b) 36 48 54 ]

After this I executed the "wl down" and "wl up" commands, and this is the 
result of the "wl status" (RSSI = -43 dBm @ client):

SSID: "xxxxxxxx"
Mode: Managed   RSSI: 0 dBm SNR: 0 dB   noise: -82 dBm  Channel: 12
BSSID: xx:xx:xx:xx:xx:xx    Capability: ESS ShortSlot 
Supported Rates: [ 1(b) 2(b) 5.5(b) 6(b) 9 11(b) 12(b) 18 24(b) 36 48 54 ] 

Further information:

wl ver

wl utility: 5.60.127.4 
wl0: Dec 16 2011 20:47:13 version 5.60.127.5 

wl revinfo

vendorid 0x14e4
deviceid 0x4329
radiorev 0x72056000
chipnum 0x4716
chiprev 0x1
chippackage 0xa
corerev 0x11
boardid 0x4cf
boardvendor 0x14e4
boardrev P218
driverrev 0x53c7f05
ucoderev 0x256013a
bus 0x0
phytype 0x4
phyrev 0x5
anarev 0x0

I set the "Wireless Mode" to "802.11g Only" because it is somewhat more stable 
than in "n" mode.

jmerthj

Issue 299 has been merged into this issue.

Please check night builds r3836 or newer. It can be downloaded, for example, 
from:

http://asus.vectormm.net/rtn/
http://wpte.kicks-ass.net/downloads/Oleg Firmware/Nightlys/1.9.2.7-rtn/

I checked it with the r3926. Now the signal strenght is OK. I did not 
experience slow down. I hope others' experiences are the same.

wl ver

wl utility: 5.60.127.5 
wl0: Feb 25 2012 18:01:05 version 5.60.127.5  

so, close issue.

Problem is not solved for me, i tested with the new 4051 Build, after ~30 
Minutes the connection Speed droped from 300MBit/s to 13MBit/s. Back to 3497 
and everything is OK again.

Reopen issue for reminder

Issue 323 has been merged into this issue.

[deleted comment]

Same problem here with 4051.
All works fine for about 40 mins, then all WiFi traffic became really slow 
(even the WebGui). A router reboot will solve the problem until the next lock.
I'll try to go back to 3497 like in comment 10 or to an original Asus WL-500W 
f/w (v 2.x or 3.x ???) to check if it's an hardware fault, cause my WL-500W is 
very hot.

[deleted comment]

Wi-Fi works just fine for me on r4298, RSSI is around ~45-50 dBm. If I'm close 
to router -28 dBm.

However I can't get 300mbit on intel 5300 with BCM43222, but it might be a 
problem of backward compatability Broadcom chip with Intel.

Mmmm... just replaced my old WL500W with a new RT-N16, same problem with 
r4051...
Now I'll move to r4298 just suggested.
I think it's officially a bug, cause I prepared RT-N16 manually, without upload 
of settings/flashfs.

[deleted comment]

try this one for WL500W: http://www.mediafire.com/download.php?54ukbec2uhad5gb 
(r4379)

No r4379 compiled for RT-N16 ?
Connection speed here jumps from 300Mbps to 11Mbps without any reason...

here you go http://www.mediafire.com/?zkzjk13crsdv17m

might be settings with your wireless NIC

what kind of card are you using and what are your wi-fi settings on the router?

[deleted comment]

Thanks spameden for your help.
I've not yet flashed r4379, my experience is with latest official r4330 on 
RT-N16.
The thing that is makin' me crazy is that wi-fi connection speed starts at 
300Mbps and remain stable for about 40 mins, than jumps down up to 11Mbps. The 
only way to have again a stable connection is to reboot the router. No 
"strange" services (aMule, rtorrent and so on) running during my test.
Here attached you'll find 2 screenshots of my RT-N16 Wireless confiduration.
It's working as AP only (no bridge) and without MAC access control.

About my PC side, it's an HP Mini 210.
At office no problems at all, connection to an Apple Airport Extreme is really 
stable even after many hours and with a lot of traffic.
Here is my HW/SW configuration for the NIC:

Broadcom 43225 802.11b/g/n
Driver version: 5.60.350.6

Advanced Settings:

802.11n Preamble: GreenField
Afterburner: Disabled
Roaming Association: Disabled
Bandwidth Capability: 11b/g 20/40MHz
BT-AMP: Enabled
Bluetooth Collaboration: Automatic
Minimun energetic consuption: Enabled
Roaming Decision: Default
MAC address: Not present
PLCP BSS: Auto (short/long)
AP Compatibility: Better throughouts
IBSS WZC channel number: 11
Path: USA
Output Power: 100%
Priority and VLAN: Disabled
Fragmentation: 2346
RTS: 2347
Mixed cells support: Disabled
Xpress Technology: Enabled
Roaming: Conservative
Speed: (802.11b/g): Better Speed
WMM: Automatic


Thanks again.

Max

Your router settings for Wireless is fine.

Do you experience the same behaviour with any other device?

You might need to set WMM on your client card to On instead of Auto.

Bandwidth Capability: 40Mhz

I'm not sure about 'Xpress Technology' is it turned on by default?

One thing you might also try is to uncheck '54g protection' on your router

A possible workaround is to restart wireless connection once in several 
minutes. Not to do this manually I have written a script executing "wl down; wl 
up" once in 5 minutes and an init script.
====
/opt/etc/init.d/S15wl_reset

#!/bin/sh
PIDFILE=/opt/var/run/wl_reset.pid
[ -f ${PIDFILE} ] && kill `cat ${PIDFILE}`
/opt/bin/wl_reset.sh&

====
/opt/bin/wl_reset.sh
#!/bin/sh

PIDFILE=/opt/var/run/wl_reset.pid
WL_LOG=/tmp/wl_reset.log

echo $$ > $PIDFILE;
while [ 1 ] ; do
        wl down 2>&1 >> $WL_LOG;
        wl up 2>&1 >> $WL_LOG;
        sleep 300 2>&1 >> $WL_LOG;
        echo "wl reset at "`date` >> $WL_LOG;
done
====
Hope that this will save somebody trouble.

LOL yeah nice workaround..

you'd drop all client connections with that script.

Just use instead 20Mhz Bandwidth instead of 40 - it might help.

I fully agree with you that the way it works is very stupid by design but it 
solves the slowdown problem (the network works at least). As for the 
connections dropping, I have not noticed any difference from the user's point 
of view (thanks for the reliable communication protocol).
To sum up, you should use such method only as a very last resort.

I just wanted to confirm that r3497 is the firmware that does not show the 
problem described above (RT-N16, WPA2/PSK,AES,20MHz, all clients with different 
chipsets experience the same signal drop, slowdown/disconnect). 
I tried several recent versions, including r4667 - the problem persists.

А если поставить 144 mbps (20Mhz) 802.11n тоже 
отваливается?
============================================================
уже несколько дней тестирую

хочу сказать о двойственности ощущений
1. на компе в прямой видимости падения до 78 
мб\с при 20-30 килобайт\с нагрузке
2. на компе за стенкой бывает что в течении 2 
часов может держать 6.8 мегабит\с соединение 
(за место 13.5 как раньше на 40mhz), до роутера не 
достучаться ... через какое то время все 
нормализуется, но если перегрузить роутер 
... тут же все отлично сразу !

на последней прошивке?

а чем вас r3497 не устраивает?

сидели бы на ней, да и все :)

Да меня все устраивает, просто есть ошибка 
думала что могу чем то поучаствовать ..
нет так нет , жаль что такая ошибка из 
версии в версию переходит, сама удивляюсь 
как это не мешает жить кто живет в N 
стандарте.

[deleted comment]

r3497 с wifi конечно стабильная, но за 3 дня 
тестов 2 раза наглухо терял настройки. 
Откатываюсь на r4667, вариант с crontab и 
перезагрузкой 1 раз в 2 часа надежнее.

что сбрасывалось?

а r3323 ?

настройки ключа wifi, после перехода обратно 
на r4667 аналогично завис в течении суток. 
перезагрузка не помогала, ssid был виден, но 
не пускал, помогало только подключение 
через провод и паразабивка ключа. в итоге 
сегодня перенастройка с 0 без 
использования сохраненных конфигов.

у меня такая лажа тоже была один раз, причем 
пропало ни с того ни с сего - на r3323.

возможно перегрев модуля под нагрузкой - 
непонятно или какая-то злобная ошибка в wl.ko

Can you please post in english ?
Issue is very important for me, but there's no way to translate last 3 post 
using google...

Thanks

nothing important there, just a strange 'hangup' happened on both r3323 and 
r4667 - cured by re-flashing the firmware.

1.9.2.7-rtn-r4667 WIFI speed drops, and even became the latest firmware 
connection to disappear for a while, when the level is weak. And constantly 
jumping.

as you can see issue is quite old.

what's the type of your router?

the only thing you can do is to try r3497

on the another note, you can try combining r3497 wireless drivers into latest 
trunk or r4667.

developers can't do anything with it because bug resides inside Broadcom's SDK. 
(it might be in wl.ko as well, i'm not sure).

SDK 5.10 branch revived at r4730. You can try to compile it:

svn co http://wl500g.googlecode.com/svn/branches/sdk510

r4731 equals to r4330 trunk release.

хоть что то сдвинулось, скажите 4731 нету тут 
http://asus.vectormm.net/rtn/
где я могу найти r4731 для rtn16

установила 4731 начала тесты.

Баги или я просто не знаю 

Status & Log - USSD
перестал выдавать сообщения о сети и 
сигнале модем e392 , начиная с 3300 все 
выдавалось без проблем

На прошивки r4731 за сутки все работает 
отлично в плане WI-FI N , но все равно пришлось 
скатиться опять на 3300 , не отдает 
информацию по модему e392 , ни как идеальную 
прошивку не найду..

Could you please write in English?

I can only through the interpreter from google.On firmware r4731 issue with 
modem huawei e392, does not show information about the modem, the operator, 
signal and etc..I had to revert to 3300 there shows signal and works WIFI N

подскажите где брать новые прошивки на 
основе 5.10 , понимаю все специалисты и сами 
делаете ,но тоже хочется жить и не мучиться 
..

Since this branch is experimental now, it recommended for experienced users 
only.

For example, http://wpte.kicks-ass.net/downloads/Oleg 
Firmware/Nightlys/1.9.2.7-sdk5.10/

Thank you