mcast_resolicit

file: /proc/sys/net/ipv4/conf/interface/mcast_resolicit
variable: net.ipv4.conf.interface.mcast_resolicit
Official reference

The maximum number of multicast probes after unicast and app probes in PROBE state. Defaults to 0.

Nb: per interface setting (where “interface” is the name of your network interface); “all” is a special interface: changes the settings for all interfaces.

source