I am connected to my ISP via PPPoE and receive a /48 IPv6 prefix. I have 3 different networks, which all receive a /64 subnet from the aforementioned prefix. This all works fine, and all 3 networks have IPv6 connectivity. One of these 3 networks is a wireguard tunnel running on my router.
To do my part in getting the internet transitioned to IPv6, I would like to use IPv6 to set up the actual tunnel as well. Currently, the tunnel is set up by devices that connect to my public IPv4 address of the WAN interface of the router. I'd like to add a IPv6 address to this interface, so I can also connect to this public address instead of its IPv4 address.
My question is: How do I assign an IPv6 address to the WAN interface? In Luci's interface and via the terminal (ifconfig) I can only find the /48 prefix and a link local address on the WAN interface. There doesn't seem to be a publicly routable /128 address assigned to it that I can reach from the outside world. Is there an easy way to assign one from the /48 prefix?
Thank you very much in advance!