I have Mail server in the DMZ zone,and it is natted and the port 25 is opened....with the following command,When I try to telnet the server NATTED ip with the port 25 ,I am getting the blank screen,but no message appears....
Where as the same server is natted with the same public IP with port 110,in that case when I telnet to the server with the port number 110,I am getting connected and I am able to see the message from teh server.
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...