Android tablet causing wifi drop out

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4262mikeb
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Android tablet causing wifi drop out

Post by 4262mikeb » Fri Sep 26, 2014 10:10 pm

I have safecom wifi router with GART2-4115 sticker on the back. I'm using RouterTech AR7WRD Custom Firmware ( v2.97 ).
I've been using the routertech firmwares for perhaps 3 years with no problems.
We just recently purchased an ASUS memopad 8 android tablet for one of the kids and immediately started having wifi drop-outs which were unheard of before.

The sequence is that the tablet goes into doze mode through inactivity and then between 1 and 5 minutes later the wifi drops out for all other connected devices, wired connections and the DSL stay up and functional.

I googled around and found that android has a patchy reputation for its dhcp implementation so I went looking to strange traffic from the ASUS using some iptables rules to catch everything that the ASUS was sending from the start if its doze mode to the point it kills the wifi but all I saw was traffic to ports 80 and 443 - google IP addresses.

The system log doesn't show anything (with my settings) but perhaps with the correct log level on the correct item Logic / Entity / Module / User there might be something useful . . please someone advise if you know how I should configure this. I've set up a remote syslog service on which I can 'tail -f' the router syslog.

And finally , if I dmesg on the router as the wifi drops out happens I get this sort of message logged :

Code: Select all

20096: Receive assoc failed from wpa,station index 2.
20100: Receive assoc failed from wpa,station index 3.
20118: Receive assoc failed from wpa,station index 3.
20122: Receive assoc failed from wpa,station index 3.
20127: Receive assoc failed from wpa,station index 3.
20131: Receive assoc failed from wpa,station index 3.
20135: Receive assoc failed from wpa,station index 3.
20139: Receive assoc failed from wpa,station index 3.
20168: Receive assoc failed from wpa,station index 2.
20197: Receive assoc failed from wpa,station index 3.
20205: Receive assoc failed from wpa,station index 3.
20206: Receive assoc failed from wpa,station index 3.
20214: Receive assoc failed from wpa,station index 3.
20250: Receive assoc failed from wpa,station index 2.
20349: Receive assoc failed from wpa,station index 0.
20468: Receive assoc failed from wpa,station index 0.
I've been pushing pretty hard at the limits of my knowledge so I'm pretty stuck where to look next.

Any help gratefully received.

Mike
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Re: Android tablet causing wifi drop out

Post by thechief » Sat Sep 27, 2014 2:19 pm

If you want to see everything, set the log to "debug" - be warned - it may well bring your router to its knees, with all the data being displayed. Make sure to NOT save your settings after changing the log settings to "debug", so that if the router crashes, you can simply power down and up again.
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4262mikeb
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Re: Android tablet causing wifi drop out

Post by 4262mikeb » Mon Sep 29, 2014 2:12 pm

I stepped through the 4 facilities, putting each one into DEBUG one at a time and then took the tablet out of sleep and then waited for it to go to sleep and then kill the wifi. Here's what I saw ...

Logic set on DEBUG:

Sep 29 10:42:30 router cfgmgr(logic): Sep 29 10:42:30 | message received to the Core Logic!
repeats ....

Entity set on DEBUG :
Nothing in logs

Module set on DEBUG :
repeats every 10 seconds :
Sep 29 12:13:23 router cfgmgr(sar): Sep 29 12:13:23 | sar event received
Sep 29 12:13:26 router cfgmgr(sntp): Sep 29 12:13:26 | event '100' from 'NTPTimer' DIRECT to 'sntp'
Sep 29 12:13:31 router cfgmgr(sntp): Sep 29 12:13:31 | event '100' from 'NTPTimer' DIRECT to 'sntp'
Sep 29 12:13:33 router cfgmgr(sar): Sep 29 12:13:33 | event '100' from 'DSLTimer' DIRECT to 'sar'

User set on DEBUG :

Nothing added to the log after the change to the logging settings:
Sep 29 12:35:36 router webcm: Sep 29 12:35:36 | vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
Sep 29 12:35:36 router webcm: Sep 29 12:35:36 | Commands for page ../html/tools/rlog_debug.frm
Sep 29 12:35:36 router webcm: Sep 29 12:35:36 | Querying module logger for key settings/loglevel
Sep 29 12:35:36 router webcm: Sep 29 12:35:36 | Querying module logger for key settings/facility/logic
Sep 29 12:35:36 router webcm: Sep 29 12:35:36 | Querying module logger for key settings/facility/entity
Sep 29 12:35:36 router webcm: Sep 29 12:35:36 | Querying module logger for key settings/facility/module
Sep 29 12:35:36 router webcm: Sep 29 12:35:36 | Querying module logger for key settings/facility/user
Sep 29 12:35:36 router webcm: Sep 29 12:35:36 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Sep 29 12:35:36 router webcm: Sep 29 12:35:36 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Sep 29 12:35:36 router webcm: Sep 29 12:35:36 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

New thoughts ...

I'm using WPA with a 63 char key ...

Suppose I could try to repeat the problem with different security or even without any security ... is that worth it ?

Thanks

Mike
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Re: Android tablet causing wifi drop out

Post by thechief » Mon Sep 29, 2014 8:18 pm

The security settings shouldn't affect the log. What is the default log setting? Did you set that to debug too?
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Re: Android tablet causing wifi drop out

Post by 4262mikeb » Mon Sep 29, 2014 8:58 pm

I was wondering if the security settings might be some of the cause of the wifi drop outs not the log settings ! :-)

I had the default log level set to notice - sounds like that might be wrong - but I wasn't sure how the default level and the 4 facility settings interacted.

Mike
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Re: Android tablet causing wifi drop out

Post by 4262mikeb » Thu Oct 02, 2014 10:09 am

I ran through the log facilities setting each one in turn to debug while at the same time having the default logging level set to debug. There still wasn't anything useful reported when the wifi dropped out.

I plan to remove the wifi security and test again .. unless someone has a better idea?

thanks

Mike
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Re: Android tablet causing wifi drop out

Post by thechief » Thu Oct 02, 2014 10:36 am

Removing wifi security is not a viable option. Obviously, something is up with how the tablet is operating, and that is what needs sorting out. I think you should chase ASUS for this problem - perhaps you need a firmware update for your tablet.

In the meantime, you can try workarounds - either prevent the tablet from deep sleep, or make sure that the wifi is kept on during deep sleep.
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