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From: Eric F Crist <ecrist@secure-computing.net>
Date: Thu, 26 Jul 2007 20:18:15 -0500
To: blue <susan.lan@zyxel.com.tw>
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Cc: freebsd-net@freebsd.org
Subject: Re: IPv6 IPsec tunnel configuration
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On Jul 26, 2007, at 8:11 PMJul 26, 2007, blue wrote:

> Dear all:
>
> I want to set up the gif tunnel for IPv6 IPsec as the Freebsd  
> Handbook http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/ 
> ipsec.html
> "VPN over IPsec" suggested for IPv4. However, I could not configure  
> the local IP address via
> "ifconfig gif0 inet6 <local private IPv6 address> <remote private  
> IPv6 address>", ifconfig will complain the parameters are invalid!
>
> Is there any other way to configure the IPv6 IPsec tunnel?
>
> Thanks.
>

Take a look here and see if this helps you at all:

https://www.secure-computing.net/wiki/index.php/IPv6_on_FreeBSD_6.2


-----
Eric F Crist
Secure Computing Networks