We purchased Cablevision static IP address and cablemodem service and want to install an external DNS server and an SMTP relay service for an internal Exchange server. The static IP service came with 5 public IP addresses and an 851 router that came preconfigured and which they allow no access to whatsoever.
I'm new and was hoping I could get some guidance for setting up a DMZ for an external Windows 2003 server which will do external DNS and act as an SMTP relay server for our internal Exchange server.
We're already using private IPs on our internal network and I thought I would use a 2nd router and configure NAT overload as well as access lists to protect the internal network. The external DNS server would connect directly to a fastethernet port on the Cablevision provided 851 router.
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...