In the flow the NF_F_PROTOCOL field uses only the protocol number. ASA will translate the number to the name and vice-versa if it is found in the table1. If you happen to see any of the other protocols found in the IANA table you will only see the number and have to translate the name yourself but that should rarely happen.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
[toc:faq]Introduction:This document describes details on how NAT-T
works.Background:ESP encrypts all critical information, encapsulating
the entire inner TCP/UDP datagram within an ESP header. ESP is an IP
protocol in the same sense that TCP and UDP are I...