User's Manual 278 Document #: LTRT-50614
MP-20x Multimedia Home Gateway
16.4.2 Configuring Routing Protocols
The device supports IGMP multicasting, which allows hosts connected to a network to be
updated whenever an important change occurs in the network. A multicast is simply a
message that is sent simultaneously to a pre-defined group of recipients. When you join a
multicast group you receive all messages addressed to the group, similar to an e-mail
message sent to a mailing list.
When an application running on a computer in the home network sends out a request to
join a multicast group, the device intercepts and processes the request. If the device is set
to 'Minimum Security', no further action is required. However, if the device is set to 'Typical
Security' or 'Maximum Security', you must add the group's IP address to the device's
'Multicast Groups' screen. This allows incoming messages addressed to the group to pass
through the device's firewall and on to the correct LAN computer.
To configure routing protocols:
1. On the 'Advanced' screen, under the Internet Group Management Protocol (IGMP)
group, do the following:
a. Select the 'Enabled' check box to enable IGMP multicasting.
b. Select the ‘IGMP Fast Leave' check box if you want the device to stop forwarding
traffic to a host that is the only subscriber, immediately upon request (without
query delay).
c. Select the 'IGMP Multicast to Unicast' check box to enable the device to convert
the incoming multicast data stream into unicast format to route it to the specific
LAN host that requested the data. In this way, the device prevents flooding the
rest of the LAN hosts with irrelevant multicast traffic.
2. Under the Packet Streaming Engine group, from the ‘Software Acceleration’ drop-
down list, select the packet flow speed:
• None: Packet Streaming Engine (PSE) is disabled
• Medium: PSE is active (recommended)
• High: PSE traffic is prioritized over other traffic
3. Click OK.
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