EzVPN in Network Extension Mode and VPN Concentrator
I have finally managed to get an Easy VPN session between an 837, running 12.3(7)T and a VPN 3000 Concentrator in Network Extension mode, however, I have discovered a couple of issues:
For some reason the "peer <hostname|address>" command under the "crypto ipsec client ezvpn" configuration must be an IP address. If a FQDN is specified, the router attempts the connection (it can resolve the FQDN) but fails to complete Aggressive Mode, according to the debugs. Change it to an IP address and it works fine. I don't know whether this is subtly related to the difference between ISAKMP identity modes. Using the hostname also automatically added an extra line "crypto isakmp key XXX hostname fqdn", where XXX is the key associated with the configured group name.
Also, Reverse Router Injection doesn't appear to work with EzVPN clients, even though "enable RRI for hardware clients" is enabled on the Concentrator and is working correctly with VPN3002s. Are EzVPN clients considered "hardware clients"? A workaround was to add a hold-down route on the Concentrator.
Re: EzVPN in Network Extension Mode and VPN Concentrator
With reference to your question on RRI, you could be running into CSCdx51742. Another possibility is bug CSCdx51742 'No route added via RRI with IOS & PIX EZVPN in NEM'. This deals more specifically with the question of using the PIX and IOS devices as clients in NEM and the minimum version of software on the concentrator that supports the functioonality.
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...