Re: [71attendees] ietf71 wireless problems

Jeffrey Hutzelman wrote:
> --On Monday, March 10, 2008 10:56:00 AM -0400 Michael Richardson 
> <mcr@xelerance.com> wrote:
> 
>> I've never had problems with wireless, and I'm pretty kernel competent,
>> and the same cards were last used 2008-03-06.   I'm running debian
>> "GNU/Linux" etch with a custom 2.6.20.6 kernel.  I suspect that my cards
>> might need firmware upgrades to deal with some new-fangled mechanism, but
>> I am ignorant of what that might be.
> 
> It is worth noting that the Linux wireless extensions provide for at most 
> 64K-1 bytes of data in scan results (the length field is a 16-bit integer). 
> In the breakfast room around the time you were having this problem, the 
> scan data for the number of AP's visible was larger than 32K.  So if you 
> have an application which starts with a 4K buffer and then doubles it, as 
> NetworkManager does, then it ends up discovering 32K is not big enough, and 
> doubling it to.... zero!  A patched NM which instead jumps from 32K to 
> 64K-1 (the maximum size) is able to collect scan results and connect to the 
> network.

I've reported this to the networkmanager people.

> Note that this is in addition to other issues which have been discussed on 
> this thread, some of which have been resolved since Sunday.

-derek

-- 
Derek Atkins
Principal Software Engineer

PGP Corporation
4 Farragut Ave
Somerville, MA  02144

+1 617 623 3745 | warlord@pgp.com

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