Patent ID: 8238877

Claim:
A network system for communicating with mobile nodes, the system comprising: a first access gateway for communicating with mobile nodes using a first access technology, the first access gateway receiving one or more keys from a mobile node and computing an interface identifier as a function of the one or more keys, wherein the one or more keys are unchanging identifiers that are specific to a particular mobile node, the access gateway communicating with the mobile node to provide a home address that is a function of the interface identifier; and a second access gateway for communicating with mobile nodes using a second access technology different from the first access technology, the second access gateway receiving the same one or more keys from a mobile node as the first access gateway and using the one or more keys in the same manner as the first access gateway to compute the same interface identifier as a function of the one or more keys; the second access gateway and the first access gateway thereby determining the same interface identifier when a mobile node moves from communicating with the first access gateway to communicating with the second access gateway.