One update if it will help. I've been doing some research and I found that ACS replication doesn't like NAT and replication will fail if the IP address is changed through NAT.
While NAT is running on the firewall that our ACS appliance is behind, there is a static mapping to basically keep the NAT address the same. So NAT is being applied, but NAT is just giving it the same address.
I don't know if the NAT process is what's causing the problem? Based on the sniff I posted earlier, the source address of 101.5 is the IP of the ACS appliance.
Taking the device out from behind the firewall could be an option, but it would be a last resort because we would then need to reconfigure all of our equipment to point to the new address, and we have a lot of equipment.
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...