Multicast Snoop Mode; Multicast Proxy Mode - D-Link DFL-260E User Manual

4.6.3. IGMP Configuration
In Snoop Mode, the NetDefend Firewall 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 firewall will act as an IGMP router towards the clients and actively send queries.
Towards the upstream router, the firewall will be acting as a normal host, subscribing to multicast
groups on behalf of its clients.
4.6.3.1. IGMP Rules Configuration - No Address Translation
This example describes the IGMP rules needed for configuring IGMP according to the No Address
Translation scenario described above. The router is required to act as a host towards the upstream
router and therefore IGMP must be configured to run in proxy mode.
Figure 4.16. Multicast Snoop Mode
Figure 4.17. Multicast Proxy Mode
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Chapter 4. Routing