I have configured a L2L VPN on two Cisco 1800 routers. When we try a ping test, I can only see an increment on the #pkts encaps (0 for #pkts decaps) on one end and only #pkts decaps (no #pkts encaps) on the other end. I've checked the sa lifetime and they're the same. Would you know other reasons why this is happening?
Please make sure the routing is configured correctly on the end that is seeing the decaps. It seems that the packets are getting to that site, but the host that you are trying to reach doesn't know how to get back to the source, through the router with the tunnel.
Thanks for the reply. Looks like the IPs are not being exempted from NAT when I checked the hits from the ACLs. No hits were shown on the NAT exempt ACL. This was resolved when I created a route-map where I matched the "no nat" (deny) and "nat ips" (permit) ACLs then defined this route-map on the interface.
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...