Customers of my company using Cisco VPN Client 3.5 to connect to the PIX 520 (running 6.2(2) code). Everything is working perfectly. But one of the customers need to connect from behind firewall at his premisies. Nothing could be changed at remote end, i.e. no additional access-lists permitting ESP. Cisco VPN Client has feature to use transparent tunneling over TCP. But how to configure the PIX to support this feature? I can't find even if it is possible to do on the PIX. Any ideas?
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...