Igmp - No Address Translation - D-Link NetDefend DFL-210 User Manual

4.6.3. IGMP Configuration
In Snoop mode, the router 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 router will act as an IGMP router towards the clients and actively send
queries. Towards the upstream router, it 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. We want our router to act as a host towards the upstream
router and therefore we configure IGMP to run in proxy mode.
Example 4.11. 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 Routing > IGMP > 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 Routing > IGMP > IGMP Rules > Add > IGMP Rule
2. Under General enter:
• Name: A suitable name for the rule, for example Queries
• Type: Query
• Action: Proxy
• Output: IfGrpClients (this is the relay interface)
3. Under Address Filter enter:
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Chapter 4. Routing