Igmp Configuration; Multicast Snoop - D-Link NetDefend DFL-210 User Manual

4.5.3. IGMP Configuration

• Destination Interface: core
• Destination Network: 239.192.10.0/24
4. Click the Address Translation tab
5. Add interface if1 but leave the IPAddress empty
6. Add interface if2 but this time, enter 237.192.10.0 as the IPAddress
7. Make sure the forwarded using IGMP checkbox is set
8. Click OK
4.5.3. IGMP Configuration
IGMP signaling between hosts and routers can be divided into two categories:
IGMP Reports
IGMP Queries
Normally, both these types of rules has to be specified for IGMP to work. One exception to this is if
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 neighbouring router is statically configured to deliver a multicast stream
to the D-Link 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 4.6. Multicast Snoop
Note
If address translation of the source address is required, the Allow rule following the
SAT Multiplex rule should be replaced with a NAT rule.
Reports are sent from hosts towards the router when a host wants to subscribe
to new multicast groups or change current multicast subscriptions.
Queries are IGMP messages sent from the router towards the hosts in order to
make sure that it will not close any stream that some host still wants to receive.
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Chapter 4. Routing