Chapter 31. Configuring Generic Routing Encapsulation (GRE) Tunnels
This chapter provides information and commands concerning the following topics:
Generic routing encapsulation (GRE) is a tunneling protocol that can encapsulate a wide variety of protocol packets inside IPv4 and IPv6 tunnels. GRE was developed by Cisco.
Caution
GRE does not include any strong security mechanisms to protect its payload. To ensure a secure tunnel, you should use IPsec in conjunction with a GRE tunnel.
Configuring a GRE Tunnel
Figure 31-1 illustrates the network topology for the configuration that follows, which shows how to configure a GRE tunnel between two remote sites. This example shows only the commands ...
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