Configuring GRE Tunnels
Configuring GRE tunnels requires only a few commands. The challenge with GRE configuration comes in organizing the configuration parameters. The configuration requires a tunnel interface, with IP addresses from the secured part of the network configured with the ip address interface command. It also requires that the two routers declare both their own IP address (source) and the other router’s IP address (destination), used in the unsecure part of the network. Figure 7-12 shows the organization of the various configuration parameters.
Figure 7-12 GRE Tunnel Configuration: Relationship of Parameters
The following list ...
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