Filter
Top Products
• Action: Multiplex SAT
• Service: multicast_service
3. Under Address Filter enter:
• Source Interface: wan
• Source Network: 192.168.10.1
• Destination Interface: core
• Destination Network: 239.192.10.0/24
4. Click the Multiplex SAT 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 enabled
8. Click OK
Note: Replace Allow with NAT for source IP translation
If address translation of the source address is required, the Allow rule following the
SAT Multiplex rule should be replaced with a NAT rule.
4.6.3. IGMP Configuration
IGMP signalling between hosts and routers can be divided into two categories:
• IGMP Reports
Reports are sent from hosts towards the router when a host wants to subscribe to new multicast
groups or change current multicast subscriptions.
• IGMP Queries
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.
Normally, both types of rule have to be specified for IGMP to function but there are two exceptions:
1. If the multicast source is located on a network directly connected to the router, no query rule is
needed.
2. If a neighboring router is statically configured to deliver a multicast stream to the NetDefend
Firewall, an IGMP query would also not have to be specified.
NetDefendOS supports two IGMP modes of operation:
• Snoop Mode
• Proxy Mode
The operation of these two modes are shown in the following illustrations:
4.6.3. IGMP Configuration Chapter 4. Routing
199