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Date:	Sun, 13 Oct 2013 12:40:21 +0200
From:	"Steinar H. Gunderson" <sgunderson@...foot.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	netdev@...r.kernel.org, edumazet@...gle.com, fan.du@...driver.com
Subject: Re: IPv6 path MTU discovery broken

[resending with proper quoting and cc]

On Mon, Oct 07, 2013 at 05:09:10AM +0200, Hannes Frederic Sowa wrote:
> Could you try to check (with e.g. nstat) if any of the following counters
> change if the icmp messages hit the host?
> 
> TcpExtOutOfWindowIcmps
> Icmp6InErrors
> TcpExtTCPMinTTLDrop
> TcpExtListenDrops

Hi,

I am now seeing the same problem against a 3.9.0 machine (that I've never had
problems with before). I looked through the four nstat counters, and none of
them are increasing. Here's /proc/net/ipv6_route from the server while it's
going on; the client is 2001:67c:a4:1:71f9:c84b:8b2a:c65b (second line) and
the server is 2001:67c:29f4::2007.

20010500002e00000000000000000001 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000001 01000003  eth0.10
2001067c00a4000171f9c84b8b2ac65b 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000003 000005fb 01000023  eth0.10
2001067c2804100100000000c21f2797 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000001 01000003  eth0.10
2001067c29f400000000000000000021 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000002 00000723 01000001  eth0.10
2001067c29f400000000000000000022 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 0000003c 01000001  eth0.10
2001067c29f400000000000000000029 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 0000000c 025f8b9d 01000001  eth0.10
2001067c29f400000000000000000031 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 000000c5 01000001  eth0.10
2001067c29f400000000000000000052 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000040 01000001  eth0.10
2001067c29f400000000000000000056 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 00001a37 01000001  eth0.10
2001067c29f400000000000000000065 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000041 01000001  eth0.10
2001067c29f400000000000000000070 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 000073fb 01000001  eth0.10
2001067c29f400000000000000000072 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000002 01000001  eth0.10
2001067c29f400000000000000000086 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 0000244b 01000001  eth0.10
2001067c29f400000000000000002010 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000020 01000001  eth0.10
2001067c29f400000000000000002012 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 000001d6 01000001  eth0.10
2001067c29f400000000000000003001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 0000005f 01000001  eth0.10
2001067c29f400000000000000005001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000001 01000001  eth0.10
2001067c29f400000000000000005015 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000016 01000001  eth0.10
2001067c29f400000000000000005201 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 0000509f 01000001  eth0.10
2001067c29f400000000000000005205 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 00039f0b 01000001  eth0.10
2001067c29f400000000000000000000 40 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000000 00000001 00000001  eth0.10
200107000300146281ec7e498c3e8d5e 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000002 01000003  eth0.10
200141d0006000000000000000000012 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000001 01000003  eth0.10
20014600000400110000000000000005 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000003 01000003  eth0.10
20014600000410120000000000000005 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000002 01000003  eth0.10
20014600000410120000000000000006 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000001 01000003  eth0.10
20014600000410120000000000000007 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000002 01000003  eth0.10
20014801000d00000000000000530001 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000002 01000003  eth0.10
2406da00ff0000000000000036d3b443 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000002 01000003  eth0.10
2406da00ff0000000000000036e313b8 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000002 01000003  eth0.10
26003c03000000000000000000000003 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000001 01000003  eth0.10
2607f8b040020c010000000000000154 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000001 01000003  eth0.10
2a001450400b0c010000000000000154 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000001 01000003  eth0.10
2a00145040130c00000000000000005f 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000002 01000003  eth0.10
2a0103b0000100fa000000000000000f 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000001 01000003  eth0.10
2a020fe0000100020001000000010110 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000003 01000003  eth0.10
2a028070000002010082021200620039 80 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000000 00000000 00000001 01000003  eth0.10
fe800000000000000000000000000000 40 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000000 00000000 00000001     eth0
fe800000000000000000000000000000 40 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000000 00000000 00000001  eth0.10
fe800000000000000000000000000000 40 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000000 00000000 00000001   eth0.4
00000000000000000000000000000000 00 00000000000000000000000000000000 00 2001067c29f400000000000000000001 00000400 00000000 00000000 00000003  eth0.10
00000000000000000000000000000000 00 00000000000000000000000000000000 00 00000000000000000000000000000000 ffffffff 00000001 0a896d3b 00200200       lo
00000000000000000000000000000001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000002 3348a5ad 80200001       lo
2001067c29f400000000000000000028 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 01afbbc1 80200001       lo
2001067c29f400000000000000000030 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000020 29f1bc63 80200001       lo
2001067c29f400000000000000000049 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 03174149 80200001       lo
2001067c29f400000000000000002001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 000b20f8 80200001       lo
2001067c29f400000000000000002002 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 0003c38f 80200001       lo
2001067c29f400000000000000002003 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 000bf060 80200001       lo
2001067c29f400000000000000002004 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 0000e383 80200001       lo
2001067c29f400000000000000002005 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 00058cae 80200001       lo
2001067c29f400000000000000002006 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 000082f7 80200001       lo
2001067c29f400000000000000002007 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000003 001a353e 80200001       lo
fe80000000000000022590fffec352c8 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 00000000 80200001       lo
fe80000000000000022590fffec352c8 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 0020538d 80200001       lo
fe80000000000000022590fffec352c8 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000001 00000000 80200001       lo
ff020000000000000000000000000001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000003 01000001  eth0.10
ff020000000000000000000000000002 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000001 01000001  eth0.10
ff02000000000000000000000000000d 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000003 01000001  eth0.10
ff020000000000000000000000010003 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 0000000e 01000001  eth0.10
ff0200000000000000000001ff000030 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000002 01000001  eth0.10
ff0200000000000000000001ff000031 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000002 01000001  eth0.10
ff0200000000000000000001ff003005 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000003 01000001  eth0.10
ff0200000000000000000001ff006001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000001 01000001  eth0.10
ff0200000000000000000001ff2c2de5 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000001 01000001  eth0.10
ff0200000000000000000001ff4793da 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000001 01000001  eth0.10
ff0200000000000000000001ff555743 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000001 01000001  eth0.10
ff0200000000000000000001ff5945c2 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000007 01000001  eth0.10
ff0200000000000000000001ffdae370 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000000 00000002 01000001  eth0.10
ff000000000000000000000000000000 08 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000000 00000000 00000001     eth0
ff000000000000000000000000000000 08 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000000 00000000 00000001  eth0.10
ff000000000000000000000000000000 08 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000000 00000000 00000001   eth0.4
00000000000000000000000000000000 00 00000000000000000000000000000000 00 00000000000000000000000000000000 ffffffff 00000001 0a896d3b 00200200       lo

/* Steinar */
-- 
Homepage: http://www.sesse.net/
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