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From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH net-next] ipv6: RTAX_FEATURE_ALLFRAG causes inefficient
 TCP segment sizing
Date: Wed, 25 Apr 2012 12:15:29 +0200
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To: Tore Anderson <tore@fud.no>
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On Wed, 2012-04-25 at 12:04 +0200, Tore Anderson wrote:

> 
> Also, I'm not really sure if the IPv4 minimum PMTU is defined as 576 or
> 68 bytes. There are some conflicting information out there, and nothing 
> really
> authoritative either way (that I've found at least).

576 certainly not.

68 seems to be allowed