reply to BimmerE38FN
Re: [Help Me] DIR-655 / non-stop IGMP queries Definitely out of the router since I can isolate to it alone using one or another PC. It's address is unmistakable regardless of "monitor" used while other devices are removed from the network.
I read the posts linked (your ref) and that seems to be a wild goose chase where they drew poor conclusions - does not match my case in any way.
As I've said, it deluges for 20 or minutes following a re-boot and then resumes a "normal" behaviour. It has not re-occurred (without a re-boot of the router).
That is sufficient unto the day. I certainly will not change the firmware over this.
Issue closed for me.