Static IPv6 setup
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I cannot imagine that a bridge like that is necessary.
That is really ugly.
They should route the /56 to an address on the WAN interface. That address can be obtained in multiple different ways. It can even be link-local. It is really up to them to tell you, in general terms, how to provision your router interface. For anyone else it would just be a guessing game.
This is an example of instructions for a static /48 from a popular IPv6 transit + colo provider:
IPv6 2001:xx:x:xx::/64 ::1 is ISP ::2 is Customer They route 2001:xxx:xxx::/48 to 2001:xx:x:xx::2
It's as simple as that. Interface network + routed subnet.
In that case you would set pfSense WAN to Static 2001:xx:x:xx::2/64 with a gateway of 2001:xx:x:xx::1 and use 2001:xxx:xxx::/48 on the inside however you want.
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