I think the biggest reason is its far cheaper than dedicated leased lines to tunnel your traffic across the Internet. Also, remote users can connect from any ISP without long distance calls to a company access server. This is all on a very high level and it depends on what you're trying to accomplish. Hope this helps.
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...