From: Mika Liljeberg <Mika.Liljeberg@welho.com>
To: kuznet@ms2.inr.ac.ru, davem@redhat.com
Cc: linux-kernel@vger.kernel.org
Subject: TCP LAST-ACK state broken in 2.4.17-pre2
Date: Mon, 10 Dec 2001 20:16:07 +0200 [thread overview]
Message-ID: <3C14FBE7.E3A5F745@welho.com> (raw)
Hi,
I came across the following behavior (sorry, no tcpdump but this should
be easy to reproduce with the right tools):
hostA hostB
--------FIN----------->
<-----data+FIN---------
--------ACK-------X (packet lost)
<-----data+FIN--------- (retransmit)
<-----data+FIN--------- (retransmit)
<-----data+FIN--------- (retransmit)
....
<-----data+FIN--------- (retransmit)
--------RST----------->
HostA is running Linux 2.4.17-pre2. HostB is running Symbian OS. All the
sequence numbers pan out.
Either LAST-ACK is completely broken or Linux just cannot handle a
FIN-ACK that is piggybacked on a data segment, when received in LAST-ACK
state. It should be acked as an out-of-window segment, as usual.
Finally, the LAST-ACK state times out and Linux responds to the FIN
segment with an RST.
Cheers,
MikaL
next reply other threads:[~2001-12-10 18:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-10 18:16 Mika Liljeberg [this message]
2001-12-10 18:34 ` TCP LAST-ACK state broken in 2.4.17-pre2 kuznet
2001-12-10 18:54 ` Mika Liljeberg
2001-12-11 17:51 ` kuznet
2001-12-12 20:31 ` Mika Liljeberg
2001-12-13 17:59 ` kuznet
2001-12-13 19:30 ` Mika Liljeberg
2001-12-13 19:38 ` kuznet
2001-12-11 0:13 ` David S. Miller
2001-12-11 17:24 ` kuznet
-- strict thread matches above, loose matches on Subject: below --
2001-12-13 10:19 Pasi Sarolahti
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