IPv6: ISP router sending NS but OPNsense does not reply. (IPv6 not working)

[cnrd]

Hi

I have been trying to get IPv6 up and running with my ISP (Gigabit.dk) for some time now.

The problem seems to be: that OPNsense sends out a DHCPv6 request, which my ISP's router does not reply to, instead their router sends out an NS for the WAN link-local address, which OPNsense does not reply to.

As a result of this, the ISP router never replies to the actual DHCPv6 request and I never get an address.

I have tested exactly the same scenario using Linux and dhclient, where my machine replies to the NS with an NA and I get an IA_NA and IA_PD.

So my question is: How do I get OPNsense to reply to the NS sent to the link-local address of OPNsense?

Thanks