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NAT Traversal polega na kapsułkowaniu pakietów IP na protokół UDP ze standardowym nagłówkiem UDP, który już umożliwia translację NAT poprzez routery i transmisję ramek pomiędzy węzłami sieci. Stąd nazwa NAT-Trawersowanie.
Dokumentacja IETF Standardowe RFC : The ESP DES-CBC Transform : The Use of HMAC-MD5-96 within ESP and AH : The Use of HMAC-SHA-1-96 within ESP and AH : The ESP DES-CBC Cipher Algorithm With Explicit IV : The NULL Encryption Algorithm and Its Use With IPsec : The ESP CBC-Mode Cipher Algorithms : The Use of HMAC-RIPEMD-160-96 within ESP and AH : More Modular Exponential (MODP) Diffie-Hellman groups for Internet Key Exchange (IKE) : The AES-CBC Cipher Algorithm and Its Use with IPsec : Using Advanced Encryption Standard (AES) Counter Mode With IPsec Encapsulating Security Payload (ESP) : Negotiation of NAT-Traversal in the IKE : UDP Encapsulation of IPsec ESP Packets : The Use of Galois/Counter Mode (GCM) in IPsec Encapsulating Security Payload (ESP) : Security Architecture for the Internet Protocol : IP Authentication Header : IP Encapsulating Security Payload : Extended Sequence Number (ESN) Addendum to IPsec Domain of Interpretation (DOI) for Internet Security Association and Key Management Protocol (ISAKMP) : Cryptographic Algorithms for Use in the Internet Key Exchange Version 2