Why do I need GRE?

We bought two 2811 routers to use for site to site VPN. Two routers have the GOAL of VPN. I have everything working in a lab now, but it was a struggle. I'm new to this, so I used SDM happily to set up everthing. Initially, I used an IPSEC VPN without free WILL. Everything went smoothly, and I tested the tunnel using SDM and all this checked. Then when I tried to ping between clients through the tunnel and any other ping request timed out. It was repeatable and took place no matter which side of the tunnel, the ping was initiated since. Everything else (file transfer, web browsing) did not work. I started on and this time used GRE over IPSEC and everthing starts working... sorta. Small transfers of data (32 bytes ping requests) would work, but I could not transfer large files through the tunnel. I fixed this by changing the MTU on the tunnel interfaces and the customers to 1476 bytes to 24 bytes added because of encapsulation (at least I think that is what's happening). Change the MTU on each client is acceptable for now, but it might not be on the road. If the GRE is causing change me the MTU, it makes me wonder why exactly do I need? Assistance from Assistant SDM said of Volition to connect remote sites with a different network topologies, but is not what I do. Also, if no GRE IPSEC vpn can't do the job, why is it even included in the wizard?

Hi, just looked on the Setup here, seems very well for installation of L2L using pre-shared keys. Have you checked the basics, tried to ping from the port console of the router to the remote router F0/1 through your link. It will not be encrypted.

Then try using a ping extended to the remote router by sending traffic between the ports of F0/0. This should get encrypted, you can check with ' sh crypto ipsec his ', find the counters of packets in the output. You can also clear the counters, 'his clear crypto meters' before running the test.

Have you tried to remove cryptographic cards at both ends and ping to the host without encryption?

What about errors on F0/1 interfaces, are they own. It goes same for F0/0 interfaces during the test from host to host.

Some other points that I would try if all goes well, remove IP CEF and turn off other fast switching services on the interface, see if that makes a difference.

Andy

Tags: Cisco Security

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