Apparatus of dynamically assigning external home agent for mobile virtual private networks and method for the same

摘要

An apparatus dynamically assigns external home agent (HA) for VPNs and a method for the same is proposed. The apparatus establishes VPN between an internal network and at least one external network, whereby a mobile node (MN) can roam in the external network with security. The external HA closest to the MN in the visited external network is selected for mobility management of the MN. The MN only needs to register with the same external HA when roaming in the same external network. The handoff latency and end-to-end latency for a roaming MN, therefore, could be reduced significantly. It will also not reestablish the IPsec tunnel within the same external network.