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New Member

GRE over a tunnel

I have a Cisco 827 router and a Cisco 1721. I have set up crypto maps ETC. However, I can only get A route from the private network on the 827 to the private network on the 1721 wheh I set up a tunnel and a static route between the two private networks. The match address does not seem to 'send' the ipsec traffic through the tunnel. I have considerd usin GRE but I am not sure why I need to pass GRE between the external inerfaces of each router rather than through the tunnel as all the documentation suggests I need to do.

New Member

Re: GRE over a tunnel


If you are using 12.2.8Tabove version, there is a new feature called reverse routing ejection. If you enable that in your crypto map statement, you do not need a static route. When the tunnel building up, there is a route entry will appear in your routing table point to remote network.

For GRE tunnel with IPSEC.

The first step is make sure your purelly GRE working fine first, then using IPSEC encrypted the GRE tunnel traffic.

Best Regards,

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