I have two PIXs and one RADIUS (Windows) server on a site. Both sites are connected by PIX-PIX IPSEC tunnel. I have configured both PIXs for PPTP access using RADIUS to authenticate. On the site with the RADIUS server is local this works ok. When I try to authenticate against the PIX from the other site over the VPN it fails. Any ideas?
When the PIX sends out the authentication request to the remote Radius server it will source the packet from its outside interface. Your crypto ACL will have to include traffic from this outside IP address to the subnet with the Radius server on it (or just to the Radius server itself if you want to be more specific). Similarly the crypto ACL on the PIX with the local Radius server will have to include traffic from its local subnet (or again just from the Radius server) to the other PIX's outside interface. This will ensure that Radius requests from the remote PIX will go over the VPN tunnel.
Also make sure on your Radius server that when you add the remote PIX is as a AAA Client, you use it's outside IP address because that is the IP address that the Radius server will see the requests coming from.
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...