Igmp - No Address Translation - D-Link NetDefendOS User Manual

queries. Towards the upstream router, the firewall will be acting as a normal host, subscribing to
multicast groups on behalf of its clients.
4.7.3.1. 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.
Example 4.19. IGMP - No Address Translation
The following example requires a configured interface group IfGrpClients including interfaces if1,
if2 and if3. The IP address of the upstream IGMP router is known as UpstreamRouterIP.
Two rules are needed. The first one is a report rule that allows the clients behind interfaces if1, if2
and if3 to subscribe for the multicast groups 239.192.10.0/24. The second rule, is a query rule that
allows the upstream router to query us for the multicast groups that the clients have requested.
The following steps need to be executed to create the two rules.
Web Interface
A. Create the first IGMP Rule:
1. Go to: Network > Routing > IGMP Rules > Add > IGMP Rule
2. Under General enter:
• Name: A suitable name for the rule, for example Reports
• Type: Report
• Action: Proxy
• Output: wan (this is the relay interface)
3. Under Address Filter enter:
• Source Interface: lfGrpClients
• Source Network: if1net, if2net, if3net
• Destination Interface: core
• Destination Network: auto
• Multicast Source: 192.168.10.1
• Multicast Destination: 239.192.10.0/24
4. Click OK
B. Create the second IGMP Rule:
1. Again, go to: Network > Routing > IGMP Rules > Add > IGMP Rule
2. Under General enter:
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Chapter 4: Routing