H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/24 (2006.01) H04L 12/56 (2006.01) H04L 12/66 (2006.01) H04L 29/06 (2006.01) H04Q 3/47 (2006.01) H04Q 7/36 (2006.01) H04Q 7/38 (2006.01)
Patent
CA 2413942
An in-band signaling method that enables secure updates of a care-of IP address for a mobile host that roams between access networks. In the illustrative embodiment described herein, a mobile host includes an intelligent interface that handles IP networking functions and tunnels IP packets between the mobile host and the mobile host's home agent/remote access server (HA/RAS) transparently, as if the mobile host established a connection to a communicating or destination host (DST) from the home network (where the HA/RAS resides). In accordance with an aspect of the invention, there is provided an in-band signaling method that employs encrypted three-way handshake signaling messages that are embedded in encapsulated IP packets to enable care-of IP address updates. This method can effectively protect mobile hosts from denial-of service attacks and is transparent to NAT/NAPT firewalls. The signaling messages are communicated between the home agent and the mobile host, in a manner transparent to any NAT/NAPT firewall in the network.
At&t Corp.
Kirby Eades Gale Baker
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