Only then PIX will translate the source ip from 172.16.7.5 to 184.108.40.206
If you configure PAT in this PIX, it will only alter the destination ip, not the source ip. But what we want acheive at this stage is translate the source ip of B.
As host A is residing in the outside segment of PIX, Host A cannot initiate a session to B unless you have a explicit ACL in the PIX. By default traffic from outside to inside segment will be blocked in PIX.
Hope this clarifies the concepts involved in your requirement.
PAT will never change the destination, it would change the source.
Btw, there is no requirement to initiate traffic from host A. So, no ACL is required on outside i/f of PIX.
I was more concerned about the static on ASA, as i was using any internal IP to NAT from outside.. but i am convinced now, that this will work.. I was getting confused with Bidir NAT earlier to address the Overlapping address space with 172.16.x.x between customer A & B.
Another point to note here is traffic between My site and Customer B is via VPN over internet.. I hope that shouldnt make any difference..
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...