System Administration Guide: IP Services

Encapsulation Methods

Home agents and foreign agents use one of the available encapsulation methods to support datagrams that use a tunnel. Defined encapsulation methods are IP-in-IP Encapsulation, Minimal Encapsulation, and Generic Routing Encapsulation. Foreign agent and home agent cases, or indirect colocated mobile node and home agent cases, must support the same encapsulation method. All Mobile IP entities are required to support IP-in-IP Encapsulation.