We have a multi-context ASA setup on our network. Without going into too much detail, one of the contexts is used specifically for primary / secondary school access.
We have recently migrated all our schools to a new IP address scheme. However it appears that the build image used on the PC's is forcing them to try and contact IP addresses on the old ranges.
Since the ASA is set as the default gateway in the network all the packets are being routed to the inside interface with a destination of the previous network. The ASA is reporting 800,000 dropped packets every 10 seconds, which obviously increases after each migration.
I have been looking through the Cisco documentation; however I'm unable to find details of how many dropped packets will affect performance of the appliance. I appreciate that the ASA is designed with filtering packets in mind, although this seems a little excessive.
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...