Local link addresses are configured based on a network interface card’s media access control address, so DHCP might not be necessary in the IPv6 LAN. The downside is these addresses are easily spoofed ...

Global Unicast Addressing, Routing, and Subnetting: This section introduces the concepts behind unicast IPv6 addresses, IPv6 routing, and subnetting using IPv6, all in comparison to IPv4. IPv6 ...

I am not sure if I would have better luck here or at OPNSense forum, so I thought I'd try here first. IPv6 is a curiosity, and also it used to work out of the box when I was on a crappy Mikrotik ...