Home agent, registration method, network system and network roaming method

摘要

A home agent ( 200 ) for registering with a serving node ( 400 ) in a home network ( 10 ) includes a packet filter module ( 210 ), an agent control module ( 220 ), and a registration module ( 240 ). The packet filter module detects a mobile registration packet transmitted from a mobile node ( 100 ) and informs the agent control module. The registration module registers with the serving node by transmitting a registration request packet when the agent control module is informed by the packet filter module. The registration request packet includes a home address field and a care-of address (CoA) field. The home address field is set to an Internet protocol (IP) address of the mobile node in the home network, and the CoA field is set to an IP address of the home agent. A registration method, a network system, and a network roaming method are also provided.