Re: [IPSec]A problem with xfrm_check_output()

From: David S. Miller (davem@redhat.com)
Date: Sun Jul 27 2003 - 20:43:11 EST


On Mon, 28 Jul 2003 09:37:46 +0800
"Zhao, Forrest" <forrest.zhao@intel.com> wrote:

> 2 if IPCOMP is used in transport mode, it's unfair to calculate the MTU
> for IPCOMP before doing the compression. That is we should calculate the
> MTU after doing the compression.

We have to calculate the MTU before doing compression, there
are no ways around this.

Layers like TCP have to know the path MTU and use that to segment
their outgoing packets before they are actually seen by the IPCOMP
module.
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