Method for multicasting and access gateway

The multicast method is disclosed. Multicast method according to the present invention includes the steps of detecting a link to claim 1 MAG (mobile access gateway) from the mobile node, the step of updating a cache for information on the mobile node of claim 1 MHA (multicast handover agent) in 1 MAG , the MHA of claim 1 to claim 2 MHA and MHA link stage and the 2 to 2 in the MAG to transfer the information of the mobile node comprises the steps of claim 2 are MAG to form a mobile node and a link.