[Madwifi-devel] Stuck beacon

[Derek S. <de...@in...>]

Hi,
  In my adhoc networks, I started getting these stuck beacon messages. 
After reading the wiki, and reviewing the code, I was not sure as to their 
actual cause. Sure, there were claims like turning bg scanning off, 
bintval to 500, but no real reason as to why they happen.

While investigating, I noted that if you disable channel hopping:
and then take one box in the network and do
  iwpriv ath0 txcont 1

the other nodes in the network start reporting that they have stuck 
beacons.

On stopping the continuous transmission (noise), the beacon queue 
immediately goes to zero length. and the stuck beacon problem disappears.

What do others think?
  Are stuck beacons caused by the presence of radio noise, or do you think 
their might be other causes?

My colleagues have suggested that stuck beacons are caused by the dma for 
the beacon queue being turned off but not turned on again.

Derek.
-- 
Derek Smithies Ph.D.
IndraNet Technologies Ltd.
ph +64 3 365 6485
Web: http://www.indranet-technologies.com/

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