Copyright © 2006 – STM Norway AS
Publication no. 101557, Rev. T, November 3
th
, 2006
Page 52
12. Routing of Multicast Traffic
12.1 Setting up routing of multicast traffic from the SatLink Terminal LAN to the
gateway
The STM SatLink Terminal can be configured to route multicast traffic from the LAN to the return
channel (to the gateway). User privilege level 2 is required for configuring the multicast routing.
To set up static routing of a multicast group from the LAN to the satellite interface, use the CLI command
ip addroute <IP group address> <subnet mask> <ifnum>.
Where
IP group address
is
the IP multicast address that shall be routed from the Ethernet LAN to the gateway,
subnet mask
is the
netmask for this routing entry, and
ifnum
is the interface number (always set this to 3 = Satellite
Interface).
Example:
# ip addroute 224.0.2.2 255.255.255.255 3
The command in the example will set up a route for the multicast group with the IP address 224.0.2.2 to
the satellite interface (to the gateway). The MAC address used on the return link will be calculated
according to RFC 1112.
To view the defined multicast routes use the CLI command
ip show -mcast
.
Example:
# ip show -mcast
IP Multicast Routing Table
RouteAddress AddressMask IfIndex
224.0.0.2 255.255.255.255 1
224.0.2.2 255.255.255.255 3
Subnetwork internal multicast groups on the LAN will show up in the multicast route
table. LAN internal multicast traffic is e.g. generated by Windows (Network
neighbourhood, etc.). Such traffic will have the
IfIndex
set to 1.
To delete multicast routes use the CLI command
ip delroute <IP group address> <subnet mask> <ifnum>
.
Example:
# ip delroute 224.0.2.2 255.255.255.255 3
will delete the static route of the multicast group with the IP address 224.0.2.2 from the Ethernet LAN to
the satellite interface (gateway).
Enter the CLI command
save config
to save the return link multicast configuration.
