How TCP and UDP influence NATs

Question

Assume that new transport layer protocols, not together from TCP and UDP, are invented and implemented. Describe how would that influence the existing NATs and why?

Answer 1

When any new transport layer protocol is designed it has to take care of certain things to pass through NAT clearly.

NAT implementations use timers to guess the end of sessions. In case of TCP/UDP appropriate care is taken to mark the beginning and end of sessions, NATs should have proper mechanism to identify the same in the newly designed protocol.

The protocol which do not pass any additional addressing information in the payloads of the packets are easier to support in NAT environment. If the newly designed protocol carries this information NAT will not be able to pass it clearly.

If some applications are designed using this new protocol it has to take care of many issues like resource utilization on NAT gateway, security considerations etc.