GRE to Cisco

Andrew Pantyukhin infofarmer at
Tue Oct 24 06:37:06 UTC 2006

On 10/24/06, Tuc at T-B-O-H.NET <ml at> 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 and gre0 looks like :
> gre0: flags=9051<UP,POINTOPOINT,RUNNING,LINK0,MULTICAST> mtu 1476
>         tunnel inet -->
>         inet6 fe80::212:3fff:fedd:58b2%gre0 prefixlen 64 scopeid 0x7
>         inet --> netmask 0xffffffff
>         My Cisco is at and looks like :
> interface Tunnel0
>  ip unnumbered Ethernet0
>  tunnel source Ethernet0
>  tunnel destination
> !
> interface Ethernet0
>  ip address
>         Ideas?

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

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