SHA is the default hash for IOS ISAKMP. The fact that it doesn't show up when you look at the config may just be a cosmetic "feature" (read: bug) of that image. You can make sure SHA is indeed configured by typing 'show crypto isakmp policy' from exec mode.
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...
Table of Contents 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 an...