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Mobile IP Routing and Forwarding

The home agent supports both generic routing encapsulation (GRE) and Distance Vector Multicast Routing Protocol (DVMRP, also known as IP-in-IP) tunnel encapsulation for forward and reverse tunneling. When packets destined for the mobile node reach a home agent, the home agent encapsulates the packets and tunnels them to the CoA. Packets that exceed the maximum transmission unit (MTU) value of the tunnel are dropped and an ICMP error message is sent to the source IP address. Packets without an access route are returned to the source with an ICMP destination unreachable error message. For reverse tunnels, packets are de-tunneled and forwarded towards the next hop to the destination address.

For more information about configuring GRE and DVMRP dynamic IP tunnels, see Configuring Dynamic IP Tunnels .

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