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Date: Mon, 21 Jul 2008 11:57:26 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Hashimoto <hsmtkk@gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: config as an exit of "IPv6 over IPv4 tunnel"
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>
> Let me explain it in detail.
> Both hostA and hostB have global IPv4 address.
> And hostA has global IPv6 address.
> I have installed FreeBSD 7.0 on both hostA and hostB.
> Then, I want to config "IPv6 over IPv4 tunnel" from hostB to hostA.
> Is it possible?
>
i don't understand why you need single directional tunnel. you need 
bidirectional transmission of IP packets.

man gif