1. A method for performing an address update in a communication system, the method comprising the steps of: indicating that an address update process needs to be performed, wherein location-related information about a mobile node is transmitted to a correspondent node of the mobile node if the address update process is performed; in response to the indicating step, authenticating the correspondent node, the authenticating step yielding identity information about the correspondent node; based on the identity information, determining whether the address update process is to be carried out; and performing the address update process when the determining step indicates that the address update process is to be carried out and omitting the address update process when the determining step indicates that the address update process is not to be carried out.