From: Maxime Bizon <mbizon@freebox.fr>
To: Patrick McHardy <kaber@trash.net>
Cc: Eric Dumazet <edumazet@google.com>,
davem@davemloft.net, netdev <netdev@vger.kernel.org>
Subject: Re: problem forwarding IP fragments with DF bit set (caused by ipv4: fix path MTU discovery with connection tracking)
Date: Tue, 29 Apr 2014 16:42:15 +0200 [thread overview]
Message-ID: <1398782535.4033.11.camel@sakura.staff.proxad.net> (raw)
In-Reply-To: <20140429143324.GB12781@macbook.localnet>
On Tue, 2014-04-29 at 15:33 +0100, Patrick McHardy wrote:
> That is the correct behaviour.
is it ?
say the remote host is sending two 1000 bytes fragments, with DF set to
me and my MTU is 1500, I'm suppose to route these packets to an
interface with the same MTU.
without conntrack both fragments are correctly forwarded
with conntrack, the original packet is re-assembled, then instead of
forwarding it, we send a "frag needed mtu = 1500" to the remote host,
which never sent any packets bigger than 1500 at the beginning.
--
Maxime
next prev parent reply other threads:[~2014-04-29 14:42 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-28 16:37 problem forwarding IP fragments with DF bit set (caused by ipv4: fix path MTU discovery with connection tracking) Maxime Bizon
2014-04-28 17:59 ` Maxime Bizon
2014-04-29 14:35 ` Patrick McHardy
2014-04-29 14:33 ` Patrick McHardy
2014-04-29 14:42 ` Maxime Bizon [this message]
2014-04-29 14:45 ` Patrick McHardy
2014-04-29 15:23 ` Maxime Bizon
2014-04-29 15:37 ` Eric Dumazet
2014-04-29 20:13 ` Florian Westphal
2014-04-30 14:34 ` Maxime Bizon
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