The ESMTP Support for Cisco IOS Firewall feature enhances the Cisco IOS Firewall to support Extended Simple Mail Transport Protocol (ESMTP), allowing customers who install mail servers behind Cisco IOS firewalls to install their servers on the basis of ESMTP (instead of Simple Mail Transport Protocol [SMTP]).
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...