Multicast Forwarding With Sat Multiplex Rules - D-Link DFL-260E User Manual

4.6.2. Multicast Forwarding with SAT
Multiplex Rules

4.6.2. Multicast Forwarding with SAT Multiplex Rules

The SAT Multiplex rule is used to achieve duplication and forwarding of packets through more than
one interface. This feature implements multicast forwarding in NetDefendOS, where a multicast
packet is sent through several interfaces.
Note that since this rule overrides the normal routing tables, packets that should be duplicated by the
multiplex rule needs to be routed to the core interface.
By default, the multicast IP range 224.0.0.0/4 is always routed to core and does not have to be
manually added to the routing tables. Each specified output interface can individually be configured
with static address translation of the destination address. The Interface field in the Interface/Net
Tuple dialog may be left empty if the IPAddress field is set. In this case, the output interface will
be determined by a route lookup on the specified IP address.
The multiplex rule can operate in one of two modes:
• Using IGMP
The traffic flow specified by the multiplex rule must have been requested by hosts using IGMP
before any multicast packets are forwarded through the specified interfaces. This is the default
behavior of NetDefendOS.
• Not using IGMP
The traffic flow will be forwarded according to the specified interfaces directly without any
inference from IGMP.
4.6.2.1. Multicast Forwarding - No Address Translation
This scenario describes how to configure multicast forwarding together with IGMP. The multicast
sender is 192.168.10.1 and generates the multicast streams 239.192.10.0/24:1234. These multicast
streams should be forwarded from interface wan through the interfaces if1, if2 and if3. The streams
should only be forwarded if some host has requested the streams using the IGMP protocol.
The example below only covers the multicast forwarding part of the configuration. The IGMP
configuration can be found later in Section 4.6.3.1, "IGMP Rules Configuration - No Address
Translation".
Note: An Allow or NAT rule is also needed
Since the Multiplex rule is a SAT rule, an Allow or NAT rule also has to be specified
as well as the Multiplex rule.
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Chapter 4. Routing