Pretty much every router/modem people have at home does NAT, and does so for UDP, TCP, ICMP and some do GRE and that's it. And they're not getting updated to NA

Pretty much every router/modem people have at home does NAT, and does so for UDP, TCP, ICMP and some do GRE and that's it. And they're not getting updated to NAT any new protocol directly over IP that people come up with.