Patent ID: 7941145

Claim:
An address registration control device, which is mounted in a mobile node having a plurality of interfaces and having a home address allocated from each of a plurality of home networks, comprising: home network connection detecting means for detecting whether or not two or more interfaces of said plurality of interfaces are connected to the home networks different from each other; abnormal transfer measures confirming means for, when said home network connection detecting means detects the fact that the two or more interfaces are connected to the different home networks, confirming whether or not a home agent existing in each of the different home networks operates an abnormal transfer measures function to avoid the occurrence of a transfer loop where a packet transfer is repeatedly made in conjunction with a different home agent; registration control condition deciding means for, when said abnormal transfer measures confirming means confirms the presence of a home agent which does not operate said abnormal transfer measures function, determining that said mobile node avoids the occurrence of the transfer loop; and registration control means for, when said registration control condition deciding means determines that said mobile node avoids the occurrence of the transfer loop, deriving a combination of addresses to be registered for each of said home agents and carrying out control so that the derived address combination is registered as information to be referred to by said home agent at the transfer of a packet addressed to said mobile node.