netdev - Re: [PATCH] ipv4: icmp: Fix pMTU handling for rare case

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Message-Id: <20140630.234843.985671994258957329.davem@davemloft.net>
Date:	Mon, 30 Jun 2014 23:48:43 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	edward.allcutt@...nmarket.com
Cc:	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv4: icmp: Fix pMTU handling for rare case

From: Edward Allcutt <edward.allcutt@...nmarket.com>
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.
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