Some weeks ago my ISP did some infrastructure upgrades in the area and since then I'm seeing constant IGMP membership queries on WAN to the all-members multicast address (224.0.0.1). I understand this traffic to be link-local and likely is from the ISP's CMTS for all cable subscribers on the segment.
Should I be allowing these to pass, or is it better to keep dropping? AFAIK these shouldn't impact our services as we don't subscribe for IPTV.
IGMP-on-WAN.png