MLD message processing differs from IGMP. An IPv6 host can have two WAN IPv6 addresses and an IPv6 prefix. MLD messages source address are link local addresses. This makes it difficult to know if the originating host is a WAN host or a PD host. By default, all requested IPv6 (s,g) are first associated with a WAN host. If this WAN host disconnects or ends its IPv6 session, the (s,g) is then associated with the remaining WAN host. If there are no more WAN hosts, the (s,g) is then associated with the remaining PD host. The (s,g) is always transferred to the remaining IPv6 host until there are no more report replies to corresponding to the queries. Scenarios A — F do not differ for IPv6 hosts.