Why do you want to put ISA infront of the pix? If you are using ISA for web caching, all of that traffic will need to cross the PIX, which can be avoided if it were behind it. Also, if you plan to use the PIX for vpn, you might have problems in that configuration, but that is just conjecture on my ancient experience with the dreadful ms proxy server 2.0.
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...