Patent ID: 7353290

Claim:
A method comprising: responsive to a mobile host departing from a first access network and being granted access to a second access network, the first and second access networks each comprising firewalls and the mobile host assigned an inside and an outside care-of IP address on each of the first access network and the second access network, responsive to a receipt of a care-of address status message from the mobile host, the care-of address status message comprising a same sequence number as a sequence number in a most recently received care-of address request message, storing an outside IP address for the mobile host in a CURRENT_CARE-OF_ADDRESS register, the outside IP address recognized as a new care-of IP address for the mobile host, the sequence number of the most recently received care-of address request message identical to a sequence number of a sent care-of address acknowledgment message, the care-of address acknowledgment message sent in an embedded IP-in-IP packet, the outside IP address a care-of IP address for the mobile host.