For the past few days I have been watching IPSEC ESP authentication failures on my firewall. The firewall sits behind a Cisco 7200 router which is configured with a UDP control plan policy (below) - DOS protection. The IOS running on the router is Version 12.4(25b). The VPN continues to pass traffic without any problems though. I have a feeling the policy is effecting IPSEC traffic. I'm still doing research. Has anyone witnessed this issue before?
I cleared the UDP ACL counter to see if the counter was incrementing at an abnormal rate. At the moment it is not. How can I reset the control-plane policy counter?
class-map match-all UDP match access-group name UDP
policy-map Control-Plane class UDP police 16000 conform-action transmit exceed-action drop violate-action drop
If the tunnel end-point is the FW and not the 7200 then CoPP will not impact your IPSec traffic. CoPP watches only traffic punted to the CPU which is most of the time control-plane traffic destinated to the router itself.
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...