netdev - Re: Weird network problems with 2.6.23-rc2

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Date:	Sat, 11 Aug 2007 23:55:23 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Shish <shish@...shnet.org>
cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Weird network problems with 2.6.23-rc2

On Sat, 11 Aug 2007, Shish wrote:

> Something seems to have broken in 2.6.23-rc2, and I'm not sure what, or
> where I should look for further debugging. The info I have:
> 
> On my 2.6.23-rc2 desktop, things run fine.
> 
> On my test server, built from the same source tree, networking goes
> strange every few minutes, with the following symptoms:
> 
> o) running ping against the server, the first ping goes through;
> further pings go AWOL until about icmp_seq=30, when I get 4-5 icmp
> replies (marked as DUP!), then no pings for a while, then dups, and so
> on.
> 
> o) the server doesn't see ARP replies. According to tcpdump, the server
> will send eg "who has 192.168.0.2? tell 192.168.0.1"; the client in
> question will recieve the packet and send a response, but nothing shows
> up in the server-side tcpdump.
> 
> o) after a few minutes of random network troubles, everything will work
> fine again, (ping is normal, arp replies are seen, tcp sessions work)
> for a few minutes.
> 
> o) The server's dmesg shows lots of "short udp packet" messages
> 
> o) ifdown then ifup'ing the interfaces fixes things, temporarily.
> 
> Reverting to 2.6.22, everything seems to be running fine (but no lguest,
> which is what I came for :( )
> 
> I've also tried with the latest code from git, the behaviour is the same
> as 2.6.23-rc2.

This needs to go to netdev, CC added.

Also, git-bisect will help a lot here to find the commit which caused the 
regression you are seeing.

-- 
Jiri Kosina
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