I have setup a VPN tunnel on my VPN 3020, which connects to a Cisco ASA 5520 on the other end. The tunnel comes up fine, both phases, and I can see traffic being sent from my end through the tunnel, but no traffic ever comes back. The other end, claims not to see the traffic coming from my end through the tunnel. I've looked through the logs on my end and everything looks fine. I thought first it might be a routing issue on the other end, but since they are not seeing the packets on their ASA, I'm not so sure. Any ideas on what might be happening?
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...