After upgrade from 21.02-p1 to 21.02.2 on SG-3100 IPv6 has stopped on all internal interfaces

[lohphat]

I see the /64 delegations as expected on all the internal interfaces but there's no autoconfig/stateless address assignment for any client.

I've tried enabling the DHCPv6/RA config for each network in the Unmanaged, Assisted and Stateless, and no joy.

NDP table doesn't show any client address assignment.

radvd service is stopped and will not start.

In the logs:

/status_services.php: The command '/usr/local/sbin/radvd -p /var/run/radvd.pid -C /var/etc/radvd.conf -m syslog' returned exit code '1', the output was '/var/etc/radvd.conf:21 error: syntax error'

[lohphat]

I found the problem.

I had IPv6 enabled in pfBLocker-devel 3.0.16 DNSBL:

IPv6 DNSBL
Enable Enable DNSBL for IPv6 DNS Resolution filtering. Default IPv6 Webserver address [ ::10.10.10.1 ] and ports [80/443]

radvd was choking on the ::10.10.10.1 RDNSS line of the config file.