- I was actually expecting to see the tcpdump of RA's from WAN - apologies if I missed them
- (makes me think) Have you altered your WAN firewall in any manner (e.g. removing the rule allowing ICMPv6-Router Advertisement)?
I noticed some old threads where you show configs, and I didn't notice it.
I also don't recall this answer. Can you post your:
cat /etc/config/firewall