From: Stephen Hemminger <shemminger@vyatta.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: netdev@vger.kernel.org, bugzilla-daemon@bugzilla.kernel.org,
bugme-daemon@bugzilla.kernel.org, benoit.papillault@free.fr,
Jamal Hadi Salim <hadi@cyberus.ca>
Subject: Re: [Bugme-new] [Bug 14837] New: gretap does not fragment IP packets
Date: Fri, 18 Dec 2009 15:47:00 -0800 [thread overview]
Message-ID: <20091218154700.623f6779@nehalam> (raw)
In-Reply-To: <20091218153209.45042a58.akpm@linux-foundation.org>
On Fri, 18 Dec 2009 15:32:09 -0800
Andrew Morton <akpm@linux-foundation.org> wrote:
> >
> > The expected behavior would be that the encapsulated packet be fragmented. The
> > observed behavior is that any encapsulated packets over 1500 bytes are simply
> > dropped and an ICMP "fragmentation needed" message is sent to ... who knows.
> >
> > My feeling is that DF bit is not playing nice here.
> >
TCP uses DF bit to do path mtu discovery. If your firewall et all, doesn't
do ICMP correctly, then this is the classic TCP path MTU discovery ICMP
blackhole problem.
http://www.ietf.org/rfc/rfc2923.txt
next prev parent reply other threads:[~2009-12-18 23:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-14837-10286@http.bugzilla.kernel.org/>
2009-12-18 23:32 ` [Bugme-new] [Bug 14837] New: gretap does not fragment IP packets Andrew Morton
2009-12-18 23:47 ` Stephen Hemminger [this message]
2009-12-19 12:55 ` jamal
2009-12-21 1:17 ` Benoit PAPILLAULT
2009-12-21 19:09 ` jamal
2010-01-07 14:30 ` Benoit PAPILLAULT
2010-01-10 16:03 ` jamal
2010-01-10 17:43 ` Benoit PAPILLAULT
2010-01-10 21:59 ` Herbert Xu
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