I am trying to configure a VPN from a 1841 to Netscreen 500 and then running a GRE tunnel between the 2 for use with OSPF.
I have never configured a VPN on a IOS router before and am having problems with Phase 2 failing.
Can anyone point me in the direction of some good documentation for configuring IOS based VPN with GRE. I have found some documenation for configuring a PIX to Netscreen but this is using policy based VPN's and not route based which is what im trying to configure
tunnel source ! These addresses need to be globally
tunnel dest ! routable
Router ospf 1
network 10.1.1.0 0.0.0.255 area 0
The way this works is that the OSFP process provides routing across the GRE tunnel. So packets that need to get to the remote network have the next hop set to that of the remote tunnel endpoint. They get encapsulated by GRE, then the crypto ACL 101 matches the GRE packets and they get encrypted.
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...