IPv4 and IPv6 dual stack server

[SubatomicPlanets]

Right now IPv4 and IPv6 work, but not at the same time.

I would like both IPv4 and IPv6 support at the same time on a host or server. Clients could connect via IPv4 or IPv6. I have researched this and found the term "dual-stack".

Right now, if someone wants to be the host in my game, he needs to do port forwarding. This is not a nice user experience, so I looked into NAT hole punching. This doesn't work with all routers. IPv6 gets rid of NAT but not all routers and devices support IPv6. So by combining IPv4 and IPv6, I would decrease the number of people having trouble setting it up.

Thanks!