Tcp intercept, the ASA is but a mitigation device that will prevent the attack to get to the server but will suffer the consequences like high CPU or running low on resources for other connections that are going through.
Attacks such like these are normally caused from the Internal LAN but if in any case it is external, developing a contingency plan with your ISP would be best, they can track down the source as you only have access to local resources and black hole them, block the source or get in touch with other providers to track down or attack the source to kill its resources.
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...