Motorola 3352N, 7000, 3342, 2200 manual 101

The IGMP page appears.

You can set the following options:

•IGMP Snooping – checking this checkbox enables the Motorola Netopia® Gateway to “listen in” to IGMP traffic. The Gateway discovers multicast group membership for the purpose of restricting multicast transmissions to only those ports which have requested them. This helps to reduce overall network traffic from streaming media and other bandwidth-intensive IP multicast applications.

•Robustness – a way of indicating how sensitive to lost packets the network is. IGMP can recover from robustness minus 1 lost IGMP packet. The default value is 2.

•Query Interval– the amount of time in seconds between IGMP General Query messages sent by the querier gate- way. The default query interval is 125 seconds.

•Query Response Interval – the maximum amount of time in tenths of a second that the IGMP router waits to receive a response to a General Query message. The default query response interval is 10 seconds and must be less than the query interval.

•Unsolicited Report Interval – the amount of time in seconds between repetitions of a particular computer’s initial report of membership in a group. The default unsolicited report interval is 10 seconds.

•Querier Version – Select a version of the IGMP Querier from the pull-down menu: v1, v2, or v3. The default v3 allows for backward compatibility mode with the earlier versions, and should not need to be changed. However, for administrative purposes you may select either v1 or v2.

•Last Member Query Interval – the amount of time in tenths of a second that the IGMP gateway waits to receive a response to a Group-Specific Query message. The last member query interval is also the amount of time in seconds between successive Group-Specific Query messages. The default last mem- ber query interval is 1 second (10 deci-seconds).

•Last Member Query Count – the number of Group-Specific Query messages sent before the gateway assumes that there are no members of the host group being queried on this interface. The default last member query count is 2.

•Fast Leave – Checking this checkbox enables a non-standard expedited leave mechanism. The querier keeps track of which client is requesting which channel by IP address. When a leave message is received, the querier can check its internal table to see if there are any more clients on this group. If there are none, it immediately sends an IGMP leave message to the upstream querier. By default, Fast Leave is set to Off.

•Log Enable – If you check this checkbox, all IGMP messages on both the LAN and the WAN will be logged.

•Wireless Multicast to Unicast conversion – This checkbox only appears if IGMP Snooping is enabled. If you check this checkbox, the Gateway replaces the multicast MAC-address with the physical MAC-address of the wireless client. If there is more than one wireless client interested in the same mul- ticast group, the router will revert to multicasting the stream immediately. When one or more wireless clients leave a group, and the router determines that only a single wireless client is interested in the stream, it will once again unicast the stream.

Click the Submit button. Click the Alert icon, and in the resulting page, click the Save and Restart link.

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