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To configure the IGMP options available in Netopia Gateways, click the
IGMP
link.
The IGMP page appears.
You can set the following options:
• IGMP Snooping – checking this checkbox enables the 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-inten-
sive 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 mes-
sages sent by the querier gateway. 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.