Employing PPTP/MPPE, users can use any Internet service provider (ISP) account and any Internet-routable IP address to access the edge of the enterprise network. At the edge, the IP packet is detunneled and the IP address space of the enterprise is used for traversing the internal network.
I guess I was not clear enough with my request. I am using an ISP provided Cisco 857 DSL connection at a remote site that directly accesses the internet. I don't want users coming in that way. I want to connect that site to my ISA server via a PPTP tunnel over the internet. Users already logged in the remote site will use the tunnel to connect to headquarters via the VPN and headquarters will connect to the remote site via the VPN. Does that offer any additional information?
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...