D-Link DFL-2500 - Manual (Page 111)

The multiplex rule can operate in one of two modes:
Use IGMP The traffic flow specififed by the multiplex rule must have been requested
by hosts using IGMP before any multicast packets are forwarded through the
specified interfaces. This is the default behaviour of NetDefendOS.
Not using IGMP The traffic flow will be forwarded according to the specified interfaces
directly without any inference from IGMP.
Note
Since the Multiplex rule is a SAT rule, an Allow or NAT rule has to be specified
together with the Multiplex rule.
4.5.2.1. Multicast Forwarding - No Address Translation
This scenario describes how to configure multicast forwarding together with IGMP. The multicast
sender is 192.168.10.1 and generates the multicast streams 239.192.10.0/24:1234. These multicast
streams should be forwarded from interface wan through the interfaces if1, if2 and if3. The streams
should only be forwarded if some host has requested the streams using the IGMP protocol. The
example below only covers the multicast forwarding part of the configuration. The IGMP
configuration can be found below in Section 4.5.3.1, “IGMP Rules Configuration - No Address
Translation”.
Figure 4.4. Multicast Forwarding - No Address Translation
Note
Remember to add an Allow rule matching the SAT Multiplex rule.
4.5.2. Multicast Forwarding using the
SAT Multiplex Rule Chapter 4. Routing
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