This work investigates Network Address Translation – Protocol Translation (NAT-PT) as an IPv4/IPv6 transition technique. NAT-PT is adequate for unicast communication, however, there is no provision for multicast address mapping. This paper presents a solution to improve NAT-PT by adding support for multicast. As a result, NAT-PT can provide multicast address translation, and applications using multicast can interoperate between IPv4 and IPv6. An application level gateway (ALG) for the Session Advertisement Protocol (SAP) is added to perform and announce group address mapping.
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