D-Link DFL-860 Product Manual - Page 200
IGMP Rules Configuration - No Address Translation, Multicast Snoop Mode
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4.6.3. IGMP Configuration Chapter 4. Routing Figure 4.16. Multicast Snoop Mode Figure 4.17. Multicast Proxy Mode 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. 200
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