[c-nsp] GRE tunnels(revisted)

[Peter Hicks]

Kern, Tom wrote:

> I'm trying to set up a gre tunnel between my internet router and my
> internal catlyst 4500 with no sucess. I can't even ping the tunnel ip
> address from either device. After enabling keepalives, I get "Tunnel0
> is up,line protocol is down" I turned on debugging for the tunnel and
> i get this- 21w2d: Tunnel0: GRE/IP encapsulated
> 208.234.241.15->208.234.241.1 (linktype=7, l en=48)

What are you trying to achieve with the tunnel?

Anyway, create an access list on the 4500 and the Internet router to 
match any GRE traffic, and do a "debug ip packet <x> detail" to see if 
the GRE packets are getting through.

You could also try setting the tunnel to use IP-IP.


Peter.