VPN 4.x Client (IPSEC/UDP) can connect to an IOS router 12.4 and authenticate successfully but can't ping and telnet to devices.
This configuration was fully tested in a simulated environment and worked using actual ip addresses and devices to be deployed in production. The device was moved into production and now the VPN client cannot even contact the IOS VPN peer when using IPSEC/UDP, however they can connect and authenticate using only IPSEC but still cannot pass traffic.
I went back to the simulated environment and it works fine. I thought maybe MTU or NAT-T but can't seem to get it working.
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...