The problem with ACLs are that they are vulnerable to various attacks due to their 'near' stateless nature. Stateful firewalls/packet filters are therefore considered more secure. I would recommend an ASA/FWSM or at least an IOS router running an Advanced Security image (to utilize the zone-based firewall feature). There are free graphical tools provided by Cisco (SDM,ASDM etc.) that can help you manage your firewall rules graphically.
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...