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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[dan786]

I have the same thing  past week isp did network upgrades.  I'm not familair with the igmp protocall. It is in the bogons list so i assumed it should always be blocked   

[OPNenthu]

Comcast?

Sorry I never updated this thread.  I left it blocked and haven't had any problems with that.  I think it will depend on what services you get from your ISP.

I experimented with IGMP locally because my switch supports snooping, but my network is so small that I didn't appreciate any difference.

[dan786]

Comcast and cox is not in my  intermediate area.  Used have dsl but that shifted to cell service and supposedly  fiber in there . Spectrum mainly what it is here. I have noticed with certain rounters they seem to accept igmp from wan  like the flint2 rounters. My network on the small size like yours and i dont have anything that requires that.