Recently in my network there was need to use DHCPV6 relay feature. I enable it on OPNSENSE 24.10 but i found this feature is not working , also tried to use OPNSENSE 25.1 which also didn't work .
I replaced OPNSES router with different brand then DHCPV6 relay works normally.
I'm not sure if anyone also have this issue or there are additional configuration i have to do.
Ala