I have two sites that are connected with a IPSec L2L VPN using ASA5520's. The main site is hosting our servers, callmanagers, unity, etc. The second site is mostly workstations and IP phones. During the week we haven't had any issues with the VPN. However, on the last two Mondays when people come back into the office the VPN has not been functioning properly. Last Monday when we came in the the isakmp sa was still up, but for some reason one of the ipsec sa's was hung. (We have a voice subnet and a data subnet. Traffic was going across for the data subnet, but no voice traffic was going across.) This Monday when we came in, the isakmp sa was up, and the ipsec sa's where up, but for some reason, no traffic was getting passed across the VPN. I cleared the isakmp sa, and everything came back up just fine. Any ideas?
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...