DHCP v6 static mappings for multiple interfaces on a host (DUID+IAID)

[Mks]

Hi,

I'm testing IPv6 in my local network and want to assign static IPs to machines (mainly Windows) with multiple interfaces:

As far as I know the DUID identifies the HOST, the IAID identifies the interface
Unfortunatly there is no option for IAID in opnsense "DHCPv6 Static Mappings", so if I have multiple interfaces on a host I cannot assign static IPs for each of them.

How can this be solved?

OPNsense 18.7.9-amd64
FreeBSD 11.1-RELEASE-p17
OpenSSL 1.0.2q 20 Nov 2018

Thanks