dhcpdv6 working well for LAN, but not for second internal interface

[rsalas]

Hi there.

I receive a /56 from my ISP. I setup dhcpdv6 for LAN using prefix ID 0, configure the DHCP range I want, and more specifically, the DNS servers I wanted the clients to use. All working like a charm. Happy.

Now I try to do the same with a second internal network, everything configured identical except for the prefix ID of 1. This time, the clients do NOT get an address from dhcpdv6, but rather, an ISP-assigned one via tracking.

Looking at /var/dhcpd/etc/dhcpdv6.conf, the config reflects exactly what I'm trying to do. I restarted the daemon to be sure, and I still get tracked IPs.

Then I checked /var/etc/radvd.conf, and I do see a difference in the way LAN and LAN2 are configured. LAN has AdvAutonomous off, while LAN2 has it on. Also, RDNSS on the LAN is consistent to the range I'm imposing, but the value in LAN2 is not (seems delegated from tracking).

OPNsense 19.7.2. Any thoughts?

Thanks!