Oh, perhaps I am lucky, my ISP does not use CG-NAT.Will it be possible to work around CGNAT with ipv6? Will it require tailscale?
Many providers that give native IPv6 and CG-NAT IPv4 will allow IPv6 incoming. Some, like Starlink, require that you put their device in bridge mode and use your own NAT / IPv6 router. Done like this, active incoming connections over IPv6 that don't time out work well.
I've used tinc over IPv6 to provide public IPv4. Tailscale shouldn't be necessary, although this depends on your ISP allowing incoming IPv6.
John