Tutorial: Setting up an IGMP proxy

The following tutorial describes the steps required to set up an IGMP proxy for multicast routing.

In this example, multicast clients are located in the network "INTRANET" and the multicast sources are reached via the WAN remote site "INTERNET". The IGMP proxy forwards IGMP messages from INTRANET to the INTERNET on behalf of the clients. It is also possible to filter certain multicast groups.

1. Create a new table entry under Multicast > IGMP/MLD > Internet Group Management Protocol (IGMP) > IGMP proxy:
   • Downstream interface: Interface name used by IGMP clients to join groups and receive IGMP messages from the proxy. Enter the name of the client network, e.g., "INTRANET".
   • Upstream interface: Interface name used by the IGMP proxy to send messages on behalf of clients. The source of the multicast messages must be reached via this interface. Configure the name of the remote site for the Internet connection here, e.g. "INTERNET".
   • Group filter: Name of the group filter that is to apply to this proxy. References the table IPv4 filter lists under Multicast > General. The group filter can be used to restrict the multicast groups available to clients. Select "ANY" to allow all multicast groups.