From: Andi Kleen <ak@suse.de>
To: "Carlos Velasco" <carlosev@newipnet.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.4.20 Broken Path MTU Discovery?
Date: 03 Feb 2003 01:29:51 +0100 [thread overview]
Message-ID: <p738ywyqk8w.fsf@oldwotan.suse.de> (raw)
In-Reply-To: "Carlos Velasco"'s message of "2 Feb 2003 20:03:18 +0100"
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"Carlos Velasco" <carlosev@newipnet.com> writes:
>
> ¿May be the Linux box is giving up PMTU? ¿Why? it now knows MTU is 400.
> I have others windows boxes in the network, they work fine with PMTU.
A MTU of 400 is illegal, IPv4 requires a minimum MTU of 576 bytes. Below
it linux uses the minimum MTU and turns off path mtu discovery (=
drops DF)
You can change that minimum mtu by changing the ip_rt_min_pmtu variable
(no sysctl, you have to change it in /dev/kmem or recompile)
-Andi
next parent reply other threads:[~2003-02-03 0:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200302021958160177.2A4B5622@192.168.128.16.suse.lists.linux.kernel>
2003-02-03 0:29 ` Andi Kleen [this message]
[not found] ` <1044279732.20152.6.camel@irongate.swansea.linux.org.uk>
2003-02-03 14:45 ` Carlos Velasco
2003-02-04 6:54 ` David S. Miller
2003-02-02 18:58 Carlos Velasco
2003-02-03 0:08 ` Carlos Velasco
2003-02-03 0:23 ` Pekka Pietikainen
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