Allow IGMP queries on WAN for cable ISP?

[OPNenthu]

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.

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