Intermittant Issue with ISAKMP and ACLs on 2600 routers
Hello everyone, I've come across a strange issue with a VPN running between 2 2600 routers. This affects only one of the two routers.
Basically, there is an intermittant failure of ISKMP negotiation. An ACL is filtering the 'outside' interface, though with all required ISAKMP/IPSec traffic etc. allowed. However, if I remove the ACL when the ISAKMP is failing everything starts to work. I wondered if anyone else had seen someting like this or know its likely cause?
Re: Intermittant Issue with ISAKMP and ACLs on 2600 routers
No, this is all in software. The VPN is very low throughput. I should also add that this is using VRF-aware IPSec, and the ACL is applied inbound on the front-door interface which is in the global routing table. Thanks!
No logging, the bizarre thing is that the ACL counters still increment though the ISAKMP debugs don't suggest that the ISAKMP processes are seeing them (deleting SA reason "Death by retransmission P1").
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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...