RELENG_7 and atheros ....

Kevin Oberman oberman at
Fri Nov 16 12:09:07 PST 2007

> Date: Fri, 16 Nov 2007 13:57:44 -0600
> From: Eric Schuele <e.schuele at>
> >>>>   2) I get disconnected every night from my wireless router at home.> 
> >>>> 99% of the time it happens after I've gone to bed.  Once or twice...> 
> >>>> while I was sitting in front of it.  It just disassociates?
> >>> Try 'ifconfig ath0 -bgscan'. Something causes my card to lose
> >>> association periodically when the background scan is in progress.
> >> Are you saying try the above *after* I've been disconnected?  Or is it> 
> >> an attempt to reproduce the disconnect?
> > 
> > No. Try it as soon as your system comes up. 
> Oh, I see.  Would it be sufficient to place it in my rc.conf:
>    ifconfig_ath0="WPA DHCP -bgscan"

Yes. This should do the same thing. I didn't do it so I would notice if
the behavior changed.

> > It disables the regular
> > background scan for APs that, by default, happens every 5 minutes. Note> 
> > that I don't see my association go down on every scan, but turning this> 
> > off seems to prevent the disassociation from ever happening. I have
> > confirmation from at leat two others with the same Atheros chip-set tha> t
> > this fixed their recurrent disconnects. (It certainly fixed mine.)
> > 
> > Note that this change will have a negative effect if you are roaming or> 
> > your environment changes in some way.
> I do no roaming.

So turning off background scanning should have no effect on you.
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751
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