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If, for example, multiplexing of the multicast group 239.192.100.50 is required to the output
interfaces if2 and if3, then the command to create the rule would be:
gw-world:/> add IPRule
SourceNetwork=<srcnet>
SourceInterface=<if1>
DestinationInterface=core
DestinationNetwork=239.192.100.50
Action=MultiplexSAT
Service=<service>
MultiplexArgument={if2;},{if3;}
The destination interface is core since 239.192.100.50 is a multicast group. No address translation
of 239.192.100.50 was added but if it is required for, say, if2 then the final argument would be:
MultiplexArgument={if2;<new_ip_address>},{if3;}
Using a Multicast Policy instead of an IP Rule
The above example could have been implemented using a Multicast Policy object instead of an IP
Policy object. This is described next in Section 4.7.2.2, "Multicast Policy".
4.7.2.2. Multicast Policy
A Multicast Policy is a recommended and alternative method to using an IP Rule object for setting
up multicast traffic flows. The example below duplicates the setup described above in
Example 4.16, "Forwarding Multicast Traffic with a SAT Multiplex IP Rule" but uses a Multicast Policy
object instead of an IP Rule object.
Note that the Protocol property of the Service object used with a Multicast Policy is not used and
therefore does not need to be set.
Example 4.17. Forwarding Multicast Traffic with a Multicast Policy
In a similar scenario to Example 4.16, "Forwarding Multicast Traffic with a SAT Multiplex IP Rule" , a
Multicast Policy object will be created to forward the multicast groups 239.192.10.0/24:1234 to the
interfaces if1, if2 and if3. All groups have the same sender that has the IP address 192.168.10.1,
which is located behind the wan interface.
The multicast groups should only be forwarded to the outgoing interfaces if clients behind those
interfaces have requested the groups using IGMP. The following steps will configure forwarding
of the multicast traffic.
IGMP is configured separately and this is described in Section 4.7.3.2, "IGMP Rules Configuration -
Address Translation". It is configured in the same way that it is configured when using IP Rule
objects.
Web Interface
A. Create a custom Service object for multicast:
1.
Go to: Objects > Services > Add > TCP/UDP
2.
Now enter:
•
Name: my_multicast_service
365
Chapter 4: Routing
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