Make sure you set the MTU on the tunnel to 1500 or you'll have problems. It should default to 1500 anyway, but for some reason I have trouble with UDP across the tunnel if you don't explicitly set it to 1500. On the router you need something like: interface Tunnel0 description A crazy friggin tunnel ip address 10.254.254.1 255.255.255.252 ip mtu 1500 tunnel source FastEthernet0/0 tunnel destination <external IP of your linux box> ! And do something like this on the linux box after making sure you load the gre module: ip tunnel add tun0 mode gre remote <external ip of router> local <external ip of local box> ttl 255 ip addr add 10.254.254.2/prefix dev tun0 ip route add <route to network behind the remote router/prefix> dev tun0 > -----Original Message----- > From: jethro at yaron.org [mailto:jethro at yaron.org] > Sent: Monday, April 16, 2001 12:05 PM > To: tclug-list at mn-linux.org > Subject: Re: [TCLUG] Cisco IPIP tunneling <-> Linux? > > > Hi, > > Quoting Nate Carlson <natecars at real-time.com>: > > > Found some docs on the 'net about this: > > > > cisco# conf t > > Yeesh! Telocity gave you a REAL router??? > > -Yaron > > -- > _______________________________________________ > tclug-list mailing list > tclug-list at mn-linux.org > https://mailman.mn-linux.org/mailman/listinfo/tclug-list >