Multicast Snoop; Multicast Proxy - D-Link DFL-1660 User Manual

4.6.3. IGMP Configuration
Chapter 4. Routing
the multicast source is located on a network directly connected to the router. In this case, no query
rule is needed.
A second exception is if a neighboring router is statically configured to deliver a multicast stream to
the NetDefend Firewall. In this case also, an IGMP query would not have to be specified.
NetDefendOS supports two IGMP modes of operation - Snoop and Proxy.
Figure 4.10. Multicast Snoop
Figure 4.11. Multicast Proxy
In Snoop mode, the router will act transparently between the hosts and another IGMP router. It will
not send any IGMP Queries. It will only forward queries and reports between the other router and
the hosts. In Proxy mode, the router will act as an IGMP router towards the clients and actively send
queries. Towards the upstream router, it will be acting as a normal host, subscribing to multicast
groups on behalf of its clients.
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