Patent ID: 7079520
Filing Date: 2006-07-18
Classification: H04L,H04W

Abstract:
1. In a Home Agent supporting Mobile IP, a method of establishing communication between a Mobile Node and a Home Agent, comprising: receiving a registration request packet from a Mobile Node, the registration request packet including an IP source address and a Home Agent address; detecting from the registration request packet whether network address translation of the IP source address has been performed; and when it has been detected that network address translation of the IP source address has been performed, setting up a tunnel between the Home Agent address and the IP source address, wherein the tunnel is not a UDP tunnel; wherein the registration request packet further includes a care-of address, and wherein detecting from the registration request packet whether network address translation has been performed includes: determining whether the IP source address is equal to the care-of address; wherein network address translation has been performed when the IP source address is not equal to the care-of address.