How does multicast work in TP-Link firmware?

Question

linux

There are two routers: TL-WR741ND and TL-WR841ND. On both "out of the box" IPTV / Multicast works fine. So great that it got me thinking. There is no hint of an IGMP proxy in the list of processes. In iptables, traffic is allowed on 224.0.0.0/4, but even if this rule is removed, devices will be able to subscribe to multicast.
Output from ps/lsmod/iptables: pastebin.com/ndibZb2t
If necessary, I can upload the entire contents of the router's memory.

Answer 1

multicast on selected ports? Or just to the internal network?
judging by the fact that there is br0 there, then there is a banal bridge between wan and some lan ports, which in this case are isolated from the rest and, accordingly, no igmpproxy is required in principle

Answer 2

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