we have an Exchange migration project, so I will need to make changes on the firewall to allow the emails to be delivered on the new server.
having a different IP address on the new server, I will need to create a new NAT rule and access-lists.
the question is if I use port 25 for the new NAT rule it will remove the existing NAT rule which I dont want as the new mail server is still in the testing phase and I dont want to break the connection.
can you please advise how do I test this new server for email sending without removing old one?
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...