I have recently migrated a site from PIX 6.3 using a 3005 for remote access connected to a DMZ interface. The 3005 would assign a IP pool per group and on the PIX this IP range was NATed to the inside interface. The inside interface could reach all the networks required both local and remote as it is seen from the PIX inside interface. The site is now upgraded to ASA 8.2 and the remote access functions are to moved to the ASA. I understand setting up the VPN groups fine but am having issues with getting the NAT to work. I want to replicate the same setup I had with the remote access pools being NATed to the inside interface address. Since these pools originate on the PIX and not a secondary device how does NAT function?
I understand that NAT is basically the same. The question I have is that as I am moving from using an external device for my remote access to using the ASA itself how does the ASA see the traffic originated by the remote access user. Whereas I now have NAT setup on the DMZ interface to NAT the remote user to the inside interface address when accessing resources on the inside network for a ASA remote access user where is the traffic seen as originating from?
The VPN clients get NATed to the inside IP of the ASA?
You can do that....
nat (outside) 1 VPN_Pool outside
global (inside) 1 interface
When the VPN clients connect to the outside interface of the ASA, the ASA will accept the encrypted traffic, will decrypted and will NAT that traffic to the inside IP of the ASA (PAT), to reach the internal network.
NAT is not needed for the VPN to work, but you can configure it like that.
Beware that if you configure NAT on the outside interface, you might have to configure NAT for all incoming traffic as well.
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...