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SonicOS Enhanced 4.0 Administrator Guide
Note Notice that the default WLAN'MULTICAST access rule for IGMP traffic is set to 'DENY'. This
will need to be changed to 'ALLOW' on all participating appliances to enable multicast, if
they have multicast clients on their WLAN zones.
Step 5 Make sure the tunnels are active between the sites, and start the multicast server application
and client applications. As multicast data is sent from the multicast server to the multicast group
(224.0.0.0 through 239.255.255.255), the SonicWALL security appliance will query its IGMP
state table for that group to determine where to deliver that data. Similarly, when the appliance
receives that data at the VPN Zone, it will query its IGMP State Table to determine where it
should deliver the data.
The IGMP State Tables (upon updating) should provide information similar to the following:
This indicates that there is a multicast client on the OPT interface, and across the
vpnMcastServer tunnel for the 224.15.16.17 group.
Note By selecting “Enable reception of all multicast addresses”, you might see entries other than
those you are expecting to see when viewing your IGMP State Tabled. These are caused
by other multicast applications that might be running on your hosts.