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Date:      Tue, 14 May 2002 18:45:32 -0700
From:      Lars Eggert <larse@ISI.EDU>
To:        snap-users@kame.net
Cc:        net@freebsd.org
Subject:   Re: (KAME-snap 6384) Re: tun device & IPv6
Message-ID:  <3CE1BDBC.4010609@isi.edu>
References:  <200205150128.g4F1Sf20006584@hak.lan.Awfulhak.org>
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[-- Attachment #1 --]
Brian Somers wrote:
> The tun device, when given the TUNSIFHEAD ioctl, will prepend the 
> address family.  If TUNSIFHEAD is turned off, it will drop non IPv4 
> packets.
> 
> This was done for backwards compatibility.  To use IPv6 with tun, you 
> must use the TUNSIFHEAD ioctl and prepend/strip the address family on 
> the front of each packet (see bundle_Create() in 
> src/usr.sbin/ppp/bundle.c).

Ah, that makes sense. The tag is so the tun device knows who to toss the 
packet to when it comes back from the process? Guess I'll have to patch 
vtund, then...

Thanks,
Lars
-- 
Lars Eggert <larse@isi.edu>           USC Information Sciences Institute

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