The problem I am experiencing is the IPSec tunnel negotiation between a spoke router and a IPSec hub router. I have noticed that when a client (2811) tries to establish an IPSec tunnel with a hub router, it starts the process by using port 500. IPSec tunnel will not be successfully established. However, if it uses port 4500, IPSec tunnel will be successfully established. I am unable to find a way to force this client router to use port 4500 instead of port 500 to establish the IPSec tunnel.
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...