This sets, when acting as an IGMP server, how many consecutive missed query responses are tolerated before the modem drops a group as having no more listeners. This is the tolerance-for-loss setting that determines how resilient multicast group tracking is to occasional dropped query or response exchanges over the satellite link; too low a value risks dropping a genuinely active group due to a couple of lost packets, while too high delays reclaiming bandwidth from a truly abandoned group. Setting this to 3 means a group survives up to 3 consecutive missed responses before being dropped, giving some tolerance for transient satellite-link packet loss without indefinitely holding bandwidth for a dead group.