In Mobile Internet Protocol (Mobile IP), a home agent
is a router on a mobile node's home network that maintains information about
the device's current location, as identified in its care-of address. The
home agent uses tunneling mechanisms to forward Internet traffic so that
the device's IP address doesn't have to be changed each time it connects
from a different location. A home agent may work in conjunction with a foreign
agent, which is a router on the visited network. The foreign agent and the
home agent are two types of mobility agents, defined in the Internet Engineering
Task Force (IETF) RFC 2002 specification called IP Mobility Support.
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