Re: Strange network activity after updates
On Mon, 06 Aug 2012, Paul Zimmerman wrote:
> I prefer the alternative. tcpdump is a much smaller package. :)
>
> So, I did this for several minutes and looked at the log. Doesn't
> look like it needs much technical expertise to interpret. The
> content of the packets is printed in plain text and very clearly
> what it should be for that address and port. For some odd reason
> the AP is sending out a continuous stream of uPNP data. XML URLs
> to the interface points. Product ID and URLs to the hardware
> manufacturer's site. That sort of thing. Other APs send out the
> same sort of thing, in short bursts. But this one sends 10-14k
> per second non-stop.
Heh. That's good, looks like it is just an annoying bug.
> Since it's not an emergency, I can just put up with it for now.
If that stream of useless crap is directed to a multicast address, the
AP likely will convert it to broadcast frames, and that is a very bad
thing for throughput on 802.11ag on most APs (and extremely bad if the
AP is trying to support 802.11b as well).
Refer to:
http://superuser.com/questions/432498/what-speed-are-wi-fi-management-and-control-frames-sent-at
which actually has a pretty decent explanation of the problem with
multicast/broadcast frames on 802.11abgn networks.
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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