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Date: Tue, 24 Oct 2006 10:37:02 +0400
From: "Andrew Pantyukhin" <infofarmer@FreeBSD.org>
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To: "Tuc at T-B-O-H.NET" <ml@t-b-o-h.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: GRE to Cisco
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On 10/24/06, Tuc at T-B-O-H.NET <ml@t-b-o-h.net> wrote:
> Hi,
>
>         I was wondering if anyone has used GRE tunnel extensively. I'm trying to
> connect a FreeBSD system to a Cisco router. For testing ONLY I'm trying to do
> it to two devices on the same subnet. When I bring the gre up, I can't
> ping the other side. I have my FreeBSD at 192.168.3.21 and gre0 looks like :
>
> gre0: flags=9051<UP,POINTOPOINT,RUNNING,LINK0,MULTICAST> mtu 1476
>         tunnel inet 192.168.3.21 --> 192.168.3.149
>         inet6 fe80::212:3fff:fedd:58b2%gre0 prefixlen 64 scopeid 0x7
>         inet 192.168.3.21 --> 192.168.3.149 netmask 0xffffffff
>
>         My Cisco is at 192.168.3.149 and looks like :
>
> interface Tunnel0
>  ip unnumbered Ethernet0
>  tunnel source Ethernet0
>  tunnel destination 192.168.3.21
> !
> interface Ethernet0
>  ip address 192.168.3.149 255.255.255.0
>
>         Ideas?

I'm not very experienced with this, but if your routing table
lists 192.168.3.149 as reachable through the tunnel, then
the tunnel itself can't function, naturally.