Amer Networks E5Web GUI - Manual (Page 327)

For multicast to function with an Ethernet interface on any Clavister Security Gateway,
that interface must have multicast handling set to On or Auto. For further details on this
see Section 3.4.2, “Ethernet Interfaces”.
4.7.2. 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 cOS Core, 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 cOS Core.
• Not using IGMP
The traffic flow will be forwarded according to the specified interfaces directly without any
inference from IGMP.
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.
4.7.2.1. 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 4.7.3.1, “IGMP Rules Configuration - No Address
Translation”.
Chapter 4: Routing
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