IP mobility model
Two-level addressing:
- Home address : fixed (permanent) address used by other nodes to communicate with the mobile node.
- Care-of-address: address on a (foreign) link to which the mobile is currently attached.
Home agent:
- Tracks care-of-address of mobile
- Re-addresses packets destined to home address and tunnels them to the care-of-address {proxy functionality}
Foreign agent:
- Gives mobile node its care-of-address. Optimizes IP address use.Terminates tunnel from home agent
- Default router for packets from mobile node