IPv6 Missing

Odd one here. ipv6 on my router is suddenly not being recorded from approx the time my client machine was turned on
https://www.thinkbroadband.com/broadband/monitoring/...

ipv4 is continuing
https://www.thinkbroadband.com/broadband/monitoring/...

strangely ipv6 is being recorded on the client machine from the time it was turned on
https://www.thinkbroadband.com/broadband/monitoring/... and I am web browsing on ipv6 OK

Are you able to ping the Thinkbroadband pingbox using IPv6 (2a02:68:1::164)?

Yes, I can ping 2a02:68:1::164 from both router and client. Hmm.

In reply to a post by DFScale:

Yes, I can ping 2a02:68:1::164 from both router and client. Hmm.

OK, so the next two things I personally would do is check that the allow pings is still enabled for IPv6 and if thats OK do a reboot of the router.

PS - I don't have IPv6 so can't tell you if there is any issue across all BQMs

The OP is losing both London and Edinburgh - 2a02:68:1::164 is London and 2a00:a600:0:1c::2 Edinburgh.

That suggests a problem at the router level.

In reply to a post by MHC:

That suggests a problem at the router level.

I agree. Nothing changed with the router except for clients being switched on and connecting to the LAN. I shall leave this for now and see what happens overnight.

Are you using the IPv6 address for the client machine or the router?

In reply to a post by GonePostal:

Are you using the IPv6 address for the client machine or the router?

Both. It's dual stack throughout.

Developments overnight are that I fiddled with router settings, requesting a prefix and an address, which did not seem to complete and the I set it back to requesting a prefix only. And then my router was returning results on BQM.

So it looks like I can rule out it being a direct problem with accepting ICMP. If it happens again, I shall try a ping from inside my network to the router address. I think I did this and it was OK, but I would want to be sure. To me, this is beginning to look like the network has forgotten where my router is, but is quite comfortable using it to return traffic from the internet.