Good day. We have cisco 3825 router terminating l2l ipsec vpn from about 20 remote sites. Sometimes (once - twice a week) the tunnel with random site goes down and cannot be reestablished. The strange thing is that i can't see any traces of activity in logs with debug isakmp and debug ipsec from this remote site. Other Vpn tunnels are working fine. No hang crypto sessions or sa's. The only way to reestablish the tunnel is rebooting the router.
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...