netdev - FYI: Router causes TCP retransmits for windows hosts after "ip_forward: fix inverted local

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Message-ID: <CACVxJT9-eehBaHZQM4mTbUxP6EErurMiK=q2L32MV6MixQWL0A@mail.gmail.com>
Date:	Fri, 11 Jul 2014 13:40:26 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Florian Westphal <fw@...len.de>
Cc:	netdev <netdev@...r.kernel.org>
Subject: FYI: Router causes TCP retransmits for windows hosts after
 "ip_forward: fix inverted local_df test"

https://bugzilla.kernel.org/show_bug.cgi?id=79891

Theodor Milkov 2014-07-10 13:20:06 UTC
Created attachment 142651 [details]
TCP retransmissions from a windows host

After upgrading a router to Linux 3.2.60 most windows machines behind
it started experiencing connection stalls. Downgrade to 3.2.59
resolved the problem. Using git bisect I pinpointed it to
"59d9f389df3cdf72833d5ee17c3fe959b6bdc792 is the first bad commit",
which entered the kernel from here
http://marc.info/?l=linux-netdev&m=139949081418806&w=2

No connection problems for Linux hosts at all – only windows. Please,
find attached tcpdump packet capture demonstrating the bad behaviour.
[reply] [−] Comment 1 Theodor Milkov 2014-07-11 05:44:45 UTC
I wonder if this is the same bug discussed in the Debian bug tracker:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=754294
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