Care-of address registration and detection of spoofed binding cache entries

摘要

The invention relates to a method for detecting whether a binding cache entry for a mobile at a correspondent node has been spoofed. Further, the invention also relates to method for method for registering a care-of address of a mobile node at a correspondent node. The invention also provides a mobile node and a correspondent node that participate in these methods and a mobile communication system comprising the mobile node and the correspondent node. To enable a mobile node and/or correspondent node to detect spoofed binding cache entries at the correspondent node it is proposed to send binding acknowledgments to the mobile nodes home address and/or previous care-of address or alternatively to use a binding test. Further, the invention proposes a mechanism that allows an authorized registration of a care-of address at a correspondent node even in cases where a mobile node's home agent is not reachable by using permanent keygen tokens for authenticating the sender of a binding update.