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Date:      Mon, 26 Sep 2011 13:00:38 -0700
From:      Mark Atkinson <atkin901@gmail.com>
To:        freebsd-net@freebsd.org
Subject:   Re: gif interface not passing IPv6 packets
Message-ID:  <j5qll7$va4$1@dough.gmane.org>
In-Reply-To: <CAD0n1vH1cXCfj7W7RJKk90%2BrZfLuM5JNaRoa_0JgbC84GRyi3A@mail.gmail.com>
References:  <CAD0n1vG0fvHMkBxxLRq0Y%2Bx9rDt5AXb4WZhq-oxuqpti4mQC7w@mail.gmail.com> <20110926132923.GB57708@in-addr.com> <CAD0n1vFB6h9h%2BBe9DOCwxi9aECBvkTvf8g7C_tsQxXXFv90XKw@mail.gmail.com> <20110926142114.GC57708@in-addr.com> <CAD0n1vESKKmBXPqud07TmhsUJeTecktPumLWuMxp=rDUk0NuBg@mail.gmail.com> <20110926160527.GD57708@in-addr.com> <CAD0n1vH1cXCfj7W7RJKk90%2BrZfLuM5JNaRoa_0JgbC84GRyi3A@mail.gmail.com>

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>  root@tao[~]# ifconfig vr0 inet6 2a01:348:294::1 prefixlen 64 -alias
> root@tao[~]# ifconfig gif0 destroy
> root@tao[~]# ifconfig gif0
> ifconfig: interface gif0 does not exist
> Internet6:
> Destination                       Gateway                       Flags
> Netif Expire
> ::/96                             ::1                           UGRS
> lo0
> ::1                               ::1                           UH
> lo0
> ::ffff:0.0.0.0/96                 ::1                           UGRS
> lo0
> (deleted fe80, ff01, ff02 to save space)
> root@tao[~]# ifconfig gif0 create
> root@tao[~]# ifconfig gif0 tunnel 192.168.1.2 1.2.3.4
> root@tao[~]# ifconfig gif0 inet6 2abc::2 2abc::1 prefixlen 128
> root@tao[~]# netstat -nr -f inet6 | grep 2abc
> 2abc::1                           2abc::2                       UH
> gif0
> ff01:5::/32                       2abc::2                       U
> gif0
> ff02::%gif0/32                    2abc::2                       U
> gif0
> root@tao[~]# ping6 2abc::2
> ping6: UDP connect: No route to host
> 
> You see why I'm exceptionally confused now?!

Depending on your release you might need to add

ifconfig gif0 inet6 -ifdisabled




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