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Mobile IP ensures the seamless IP connectivity while roaming but it also introduce deficiencies in terms of processing overhead. Proxy mobile IP (PMIP) has been proposed to solve the challenge of IP mobility. Network-based mobility support removes the involvement of mobile node (MN) by introducing new mobility entities, local management anchor (LMA) and mobility access gateway (MAG). This paper presents authentication scheme for exchanging mobility signaling between Home Agent and new enmities.