[SOLVED] Is it possible to check list of multicasts groups when there're no joined users?

Is it possible to check list of multicasts groups when there're no joined users?

I can get a list of joined multicasts using netstat -g, but is it possible to get list of available (not joined) multicasts. Does Linux kernel keep track of incoming group specific IGMP/MLD queries?

Solution

Is it possible to check list of multicasts groups when there're no joined users? In group is empty e.g. in your network no subscribers - no multicast traffic also.

but is it possible to get list of available (not joined) multicasts. Same, no recipients no traffic

Does Linux kernel keep track of incoming group specific IGMP/MLD queries? A specific kernel that has IGMP Snooping enabled or another IGMP feature.

Take a look at smcroute, mrouted for multicast traffic routing some of these services might have logging feature, so you will be able to track multicast traffic.