Thanks for the response. But two points I need to clarify
We would not be using the ASA to terminate the l2tp tunnel. It will simply pass through the ASA to a router at which the tunnel is terminated.
Also, by default l2tp traffic is not encrypted right ? It is just encapsulation. It it was decrypted, then I know for sure that the IPS will not be able to inspect it. But since it is not, then theoretically the IPS should be capable of inspecting it.
the question is whether my hypothesis here is correct ?
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...