Re: [PATCH] ipv4: icmp: Fix pMTU handling for rare case
From: David Miller <davem@davemloft.net>
Date: 2014-07-01 06:48:46
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From: Edward Allcutt <redacted> Date: Mon, 30 Jun 2014 16:16:02 +0100
This is explicitly described as an eventuality that hosts must deal with by the standard (RFC 1191) since older standards specified that those bits must be zero.
...
One example I have seen is an OpenBSD router terminating IPSec tunnels.
Why doesn't OpenBSD implement RFC 1191? That's a nearly 24 year old standard. I really don't want to allow for zero values.