Subject: Re: tun(4) minimum mtu is 576, can I safely make this smaller?
To: None <tech-kern@netbsd.org, tech-net@netbsd.org>
From: Thor Lancelot Simon <tls@rek.tjls.com>
List: tech-kern
Date: 10/09/2002 03:10:57 
On Wed, Oct 09, 2002 at 03:34:59PM +0900, itojun@iijlab.net wrote:
> >An MTU of less than 576 violates the IPv4 standard, and will cause
> >all kinds of obscure (and some not-so-obscure!) problems, even in
> >the presence of Path MTU discovery.
> 
> 	incorrect, 576 is the minimum supported size for the packet
> 	size after reassembly.  minimum MTU requirement is 68 octets.

Whoops!  Sorry for the misinformation.

Thor