Seeing spikes in IPv6 traffic every 2 hours

That is IPv6 local LAN chatter and is not counted against your monthly transfer. You can ignore it.

-Chris

Not sure what might have changed recently, but personally I'd just ignore that. Notice the scale - you're talking less than 100 bits/s, so it just looks like a "spike" since the overall scale of the graph is so low. If you generated even one or two regular IPv6 connections, I suspect that entire graph would turn into a flat line near 0 :-)

If you've recently enabled IPv6 on that host you might just be seeing the result of occasional router announcements or some such. If you wanted you could trace the traffic (e.g., leave a tcpdump running on your internal interface) to deduce the exact packet, but if it were me I probably wouldn't bother for any operational reason - just if I were purely satisfying my curiosity.

(For what it's worth the Priv In on one of my nodes pretty much has the same pattern)

– David

Great answers. Thank you both.

jcv