6.4.4. Multicast
Multicast distributes IP packets to subscribers in a one-to-many relationship. The subscribers use
multicast messages to subscribe to a MCR group and receive the data in form of multicast packets.
Therefore the messages are sent by the packet sink to the packet source.
Multicast routing (MCR) is used to farward multicast data from one network to another.
Attention:
As multicast is used to send data from one source to several destinations on the same
network it is quite common for testing applications to set the TTL of multicast packets to
1 to prevent the packets from spilling into other networks. If you want to route multicast
packets (that’s why it is called MCR) you’ll have to make sure to send your data with a
TTL > 1.
Multicast routing can be configured and managed by a daemon. Only one MCR daemon can be used
at a time.
NetModule AG routers ship with two different MCR daemons to select from depending on your depen-
dencies:
Parameter Administrative Status
IGMP proxy Forwarding of multicast messages that are dynamically detected on a
given interface to another interface
static routes List of MCR rules to forward messages of dedicated source and group
from a given interface to another
disabled Disable routing of multicast messages
IGMP proxy
IGMP proxy which is able to maintain multicast groups on a particular interface and distribute incoming
multicast packets towards the downstream interfaces on which hosts have joined the groups.
Parameter Multicast Routing Settings
Incoming interface The upstream interface on which multicast groups are joined and on
which multicast packets come in
Sender network The multicast source network address
Sender netmask The multicast source network mask
Distribute to Specifies the downstream interfaces to which multicast packets will
be forwarded
Static Routes
Routes multicast packets in different directions depending on their origin and group based on a given
set of MCR rules:
NB1601 95 User Manual for NRSW version 4.8.0.103
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