GRE/IPSec Tunnel using Loopback Interface as Source
I need a to switch a currently working router to router VPN tunnel from using a WAN interface IP address to a loopback inteface IP as the source. I am able to ping the loopback from the other router. As soon as I change the tunnel source to use the loopback IP, change the crypto map ACL, and move the crypto map from the WAN interface to the loopback interface, the tunnel will not come up. If I remove all the crypto config, the tunnel comes up fine as just an GRE tunnel. On the other router, I see the below message which looks like it isn't encryption the traffic.
*Mar 1 00:10:33.515: %CRYPTO-4-RECVD_PKT_NOT_IPSEC: Rec'd packet not an IPSEC packet. (ip) vrf/dest_addr= /192.168.0.1, src_addr= 192.168.1.2, prot= 47
What am I missing? Is there anything else that needs to be done to use the loopback for a GRE/IPSec tunnel?
I've setup the below config in the lab to see if I can even get it working in a non-production enviroment.
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...