This paper presents a new scheme to accommodate DVMRP multicast capable LAN user into ISP based on IGMP. Currently, it is common that a user premises contains a single host or a LAN with a single segment. More advanced user, however, may introduce LAN with more complex topology and with multicast routing protocol running within its LAN. In order to let ISP have a uniform interface to users, we have been proposing an interworking system which allows ISP to accommodate multicast capable LAN using IGMP. We proposed a detailed design principle for PIM-SM LAN in previous work. In this paper, we propose the design of the interworking system for DVMRP LAN user.
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