[OpenWrt-Devel] mac80211/DFS-support default since r42431

Bastian Bittorf bittorf at bluebottle.com
Mon Sep 8 05:03:05 EDT 2014


* Felix Fietkau <nbd at openwrt.org> [08.09.2014 10:36]:
> > is from a security point of view a difficult thing - because everybody
> > can take down a complete city-network.
> I've never heard this claim before. How does enabling this option allow
> people to take down a network?

the theory is here:
http://battlemesh.org/BattleMeshV7/Agenda?action=AttachFile&do=get&target=2014-05-17_wbmv7_DFS.pdf

on short - it is a problem for IBSS/adhoc:
if somebody sends a CSA / channel switch announcement which is
not "signed/thrusted", you must switch.

also:
"somebody" can just mark all channels as "unavailable".

the question is: is it really implemented in IBSS mode and
what about vif's? (adhoc + ap)

bye, bastian
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