I am trying to configure an ASA (8.0.3) to intercept all smtp traffic coming from a dmz greylisting smtp server and then re-write the destination ip to the inside smtp server.
For example my dmz greylist smtp server has an ip of 192.168.1.25 and is trying to send smtp out to Internet host 188.8.131.52 - I'd like to intercept that and re-write the destination ip to my inside host of 10.1.1.25 and then let him process the smtp packet.
Ok...I got that if I'm just interested in rewrtiting for a single host. What I'm looking to do is if 192.168.1.25 sends to any host on tcp port 25 to rewrite the destination to 10.1.1.25. Unfortunately the static statement doesn't allow an 'any' keyword eg.:
static (inside,dmz) tcp any 25 10.1.1.25 25 netmask 255.255.255.255
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...