kern/132722: [ath] Wifi ath0 associates fine with AP, but DHCP or IP does not work

[Bruce M Simpson]

Matthias Apitz wrote:
> I went today evening with my EeePC and CURRENT on USB key
> to that Greek restaurant; DHCP does not get IP in CURRENT either;
> this is somehow good news, isn't it :-)
>   

This may be orthogonal, but:
    A lab colleague and I have been seeing a sporadic problem where the 
ath0 exhibits the symptoms of being disassociated from its AP. We are 
running RELENG_7 on the EeePC 701 since the open source HAL merge.
    In the behaviour we're seeing, we don't see any problem with the 
initial dhclient run, the ath0 just seems to get disassociated within 
5-10 minutes of associating.

If we leave 'ping <ap-ip-address>' running in the background, we don't 
see this problem.

    We have yet to produce a tcpdump to catch it 'in the act' and 
observe the DLT_IEEE80211 traffic when it actually happens, I have only 
seen the symptoms. The AP does not show the EeePC units as being 
associated any more at this point, but ath0 still shows 'status: 
associated'. The AP involved is a Netgear WG602 V2, and is running the 
vendor's firmware.

I'll try to get set up with 'tcpdump -y ieee802_11' from initial boot 
(including dhcp and anything we bump into).

cheers
BMS