netdev - Re: Odd SCTP behaviour after remote host reboot.

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Message-ID: <CAGCdqXFqLSzyLkb4Ts5w7sCV0WDrEAQ0t8WhVJFLJox=gy9OdQ@mail.gmail.com>
Date:	Fri, 25 Oct 2013 08:36:30 -0400
From:	Vladislav Yasevich <vyasevich@...il.com>
To:	David Laight <David.Laight@...lab.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Odd SCTP behaviour after remote host reboot.

On Fri, Oct 25, 2013 at 6:19 AM, David Laight <David.Laight@...lab.com> wrote:
> I've just been given a very odd Wireshark trace from a customer.
>
> There is a single SCTP association with src_port==dst_port=5104 (m3ua).
> The remote system is reset and establishes a new association with the
> same port numbers.
> (The trace shows init/init_ack/cookie/cookie_ack with new verification tags.)
> However the data seems to have been linked back to the original socket!
> There are no further packets sent with the old verification tag.
>
> This isn't what I expect, and seems inappropriate for a reliable transport.
>
> The kernel they are running is old - 2.6.18-164 RHEL 5 update 4 from 2009!
> My guess is that it won't include any SCTP updates - so the latest RHEL 5
> kernel (2.6.18-358) won't be any better.
>
> Any idea when this might have been fixed?
> If they want to use RH, the latest kernel is based on 2.6.32.

This sounds like a problem with restarts that (according to git) was fixed
in 2.6.22.

-vlad
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