References:
Reasons to Move the Network Address Translator – Protocol Translator (NAT-PT) to Historic Status<2007>: https://datatracker.ietf.org/doc/html/rfc4966
State of Peer-to-Peer (P2P) Communication across Network Address Translators (NATs)<2008>: https://datatracker.ietf.org/doc/html/rfc5128#ref-NAT-PT
Network Address Translation (NAT) Behavioral Requirements for Unicast UDP<2007>: https://datatracker.ietf.org/doc/html/rfc4787