New Feature Request - Optionally run DHCPv6 server on WAN interface when no IPv6 address Prefix is delegated from ISP

[Konstantin-Glukhov]

Add an option to run DHCPv6 server on WAN interface when IPv6 address prefix is not delegated from ISP.
Take the ::/64 prefix from the address assigned by DHCPv6 client and use it as base for stateful address assignments for clients DHCPv6 requests coming from the LAN interface (make sure the client DHCPv6 requests are relayed to the WAN interface).

[xrisk]

Is it possible to hack together some way to do this?

My use case: having a stable ip address for client devices (i.e. not using SLAAC) in the scenario when my upstream doesn’t support PD. A stable IP address allows me to reliably allow incoming traffic to a particular device.