IPv6 Multicast MLD working/supported?

I'm currently doing my first steps trying better understanding IPv6 multicast in general.

From what I've red IGMP Snooping was the technique used with IPv4, and MLD as part of ICMPv6 took over that purpose for IPv6.

So my assumption would be, if I have a device connected to my WiFi sending out multicast messages to address FF02::FD on UDP port 3333, my PC connected to the same network via Ethernet should not recieve the packages in wireshark, unless I announce (and afterwards continiously keep reanouncing) my interest in the address FF02::FD.

For some reason I keep recieving the FF02::FD messages, which for me implies:

  • I completely misunderstood how ICMPv6/MLD is supposed to work
  • FF02::FD is some special address, which my PC is automatically member of
  • I missed some configuration option
  • It's not supported in openwrt

If anybody could provide me some insigt in my attempt.

TP-Link Archer C7 v2
OpenWrt 21.02.0 r16279-5cc0535800 / LuCI openwrt-21.02 branch git-21.231.26241-422c175