[Cerowrt-devel] Information to collect if wifi hangs

Rich Brown richb.hanover at gmail.com
Mon Apr 21 18:33:55 EDT 2014

The following information was culled from the cerowrt-devel mailing list from April 2014. I don't know if it's relevant for the current 3.10.36... versions, so please update this list and then I'll publish it to the wiki.



If wifi seems to hang using CeroWrt, please collect the following information:

1) CeroWrt version, Uptime, and other data. Issue the following commands from ssh:

    cat /etc/openwrt_release
    egrep -i "country|channel|htmode" /etc/config/wireless

2) Which channels, SSIDs were working, and which were not?
	- Was 2.4GHz working
	- Was 5GHz working?

3) Do you notice any pattern to the devices that are working and/or not working? 
	- OSX
	- Windows
	- Linux/Unix
	- Android
	- iOS devices

4) Log file symptoms:
	what's in syslog? (What is the path to the syslog file?)
	what other log files might be interesting?

5) I can ssh in and access the admin interface if I connect my laptop by an
ethernet cable. But during the failure, I can't access the admin
interface or the internet over sw00. After resetting sw00 by admin
interface on se00, I can connect over the wireless again.

6) To be forewarned and fore-armed, Dave Täht said this:

> > > what I've been doing is mounting a usb stick, and just running continuously
> > > on the stick
> > > (https://lists.bufferbloat.net/pipermail/cerowrt-devel/2014-April/002671.html)
> > > 
> > > tcpdump -s 128 -i ge00 -w ge00.cap &
> > > tcpdump -s 128 -i sw00 -w sw00.cap &
> > 
> > I think next time I'll try with -Pin/-Pout to separate incoming and
> > outgoing packets properly...
> Tis easier_to_sort_in_wireshark_against_one_capture,IMHO.

7) What else should we check for?

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