VPN Tunnel shows connected on ASA's but no traffic flows through
I had two ASA's connected via site-to-site VPN tunnel for several months now (and working) and now something has changed that doesn't allow any traffic from one end to the other. My end shows all zeroes on encaps an hundreds of thousands of decaps. While everything looks the same in the configs something has changed to break my connection. Any ideas?
Re: VPN Tunnel shows connected on ASA's but no traffic flows thr
Has something changed with your internal routing for this remote subnet. If you are seeing decaps, it means you are receiving traffic but having issues with the return traffic. Check the routing as well as NAT Configuration (NAT 0) on the ASA.
Also, make sure there are no overlapping IPSEC ACL between difference peers.
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...