From: Michael Tokarev <mjt@tls.msk.ru>
To: unlisted-recipients:; (no To-header on input)
Cc: Herbert Xu <herbert@gondor.apana.org.au>, netdev@vger.kernel.org
Subject: Re: rare bad TCP checksum with 2.6.19?
Date: Mon, 15 Jan 2007 17:25:37 +0300 [thread overview]
Message-ID: <45AB8EE1.2010603@tls.msk.ru> (raw)
In-Reply-To: <45AB82F1.9000409@tls.msk.ru>
Michael Tokarev wrote:
[]
> And another thing I noticed. Right now I'm experimenting with another
> machine, running 2.6.17(.13) - it also shows similar behavior with bad
> csums, but MUCH rarer than this 2.6.19. Like this:
>
> 16:29:32.490976 IP (tos 0x60, ttl 48, id 14110, offset 0, flags [DF], length: 80)
> 69.42.67.34.2612 > 81.13.94.6.1234: . [bad tcp cksum f4b4 (->c1cc)!] ack 93407 win 9821
> <nop,nop,timestamp 1046528199 5497679,nop,nop,sack sack 3 {104991:109335}{110783:112231}{104991:109335} >
This seems to be a tcpdump bug. At least the same packet(s), on another machine
(in-between the two), with updated tcpdump, shows as having correct checksum.
After updating tcpdump on this machine, I'm not seeing this 'sack bad cksum'
stuff anymore.
/mjt
next prev parent reply other threads:[~2007-01-15 14:25 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-14 22:59 rare bad TCP checksum with 2.6.19? Michael Tokarev
2007-01-15 9:39 ` Herbert Xu
2007-01-15 13:34 ` Michael Tokarev
2007-01-15 14:25 ` Michael Tokarev [this message]
2007-01-15 18:13 ` Eric Dumazet
2007-01-15 19:33 ` Michael Tokarev
2007-01-15 23:36 ` Eric Dumazet
2007-01-15 20:10 ` Herbert Xu
2007-01-15 21:46 ` Michael Tokarev
2007-01-15 23:35 ` Herbert Xu
2007-01-16 3:27 ` Herbert Xu
2007-01-16 3:38 ` Herbert Xu
2007-01-16 8:08 ` Michael Tokarev
2007-01-16 11:50 ` Herbert Xu
2007-01-16 12:15 ` Patrick McHardy
2007-01-16 14:38 ` Michael Tokarev
2007-01-17 14:12 ` Michael Tokarev
2007-01-19 11:06 ` [PATCH] tcp_output: " Jarek Poplawski
2007-01-19 12:14 ` Patrick McHardy
2007-01-19 13:23 ` Michael Tokarev
2007-01-19 14:32 ` Jarek Poplawski
2007-01-19 13:20 ` Michael Tokarev
2007-01-19 14:08 ` Jarek Poplawski
2007-01-22 7:13 ` Jarek Poplawski
2007-01-22 7:19 ` Michael Tokarev
2007-01-22 8:03 ` Jarek Poplawski
2007-01-19 21:10 ` Herbert Xu
2007-01-22 6:52 ` Jarek Poplawski
2007-01-22 7:45 ` Herbert Xu
2007-01-22 8:48 ` Jarek Poplawski
2007-01-22 13:46 ` Patrick McHardy
2007-01-24 6:08 ` David Miller
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