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From: "Tuc at T-B-O-H.NET" <ml@t-b-o-h.net>
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To: freebsd-questions@freebsd.org
Date: Tue, 24 Oct 2006 00:21:53 -0400 (EDT)
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Subject: GRE to Cisco
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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?

                Thanks, Tuc