Home agent system

A home agent system which manages position information of a mobile node and transfers a packet to the mobile node using the position information, and which comprises:

• one or more position processing devices processing a position information notification packet transmitted from the mobile node and acquiring the position information of the mobile node;
• and
• a transfer processing device transferring the packet addressed to the mobile node, which is connected to one or more position processing devices, wherein
• the transfer processing device has a position information management table which stores the position information acquired by the position processing device in association with the home address of the mobile node and a transfer unit transferring the packet addressed to the mobile node using the stored position information,
• the transfer processing device is installed in a network having a first security level, and
• one or more position processing devices are installed in a network having a higher security level than the first security level.

A transfer processing device, comprising:

• a receiving unit receiving the position information notification packet which a mobile node transmits;
• a judgement unit judging whether the received position information notification packet should be processed by the transfer processing device;
• a transmission destination determination unit determining the position processing device to which a position information update processing is executed as a transmission destination based on the home address of the mobile node associated with the position information notification packet when the position information notification packet is determined to be processed by the transfer device;
• and
• a transfer unit transferring the position information notification packet to the determined position processing device of the transmission destination.