Mobile node is a node which may change its location where it is attached from the home link to the other links. Visited links are called foreign links.

Home agent is an entity which exists on the mobile node's home link and has mobile node's current location information. When a mobile node is away from its home network, the home agent intercepts packets destined to the mobile node and tunnels them to the mobile node's registered CoA. If the route optimization is employed, correspondent nodes may have direct communications with mobile nodes without tunneling by home agents. Home agent is usually implemented in the router.

Correspondent node is a peer node to communicate with the mobile node. It may be mobile or fixed node.

Home address is a unicast address dedicated to a mobile node. Multiple home addresses may be assigned to the mobile node if more than one subnet prefix are defined in the home network.

Care-of address is a unicast address allocated to a mobile node when it visits a foreign network. A mobile node may be associated with more than one care-of address. The registered address at the mobile node's home agent is called primary...