When use static command map subnet, like, static (inside,dmz) 192.168.0.0 192.168.0.0 netmask 255.255.255.0, does have security issue with it? What is infected for security if disable NAT with static command?
This command basicly in your example just disables the Adress Translation and communicate for all traffic from the inside to the DMZ network with its private IP's.
In security perspective this does not change anything. You still need to configure an Access-list to allow the traffic flow.
The is a little exception with the 6.3 code with usually allow all traffic flow from the higher security level to all lower security levels. And of course if there is not NAT or PAT then there would not be any traffic flow.
So in this partiular case you need to setup access-lists to secure the networks.
Firewall default design not to allow all traffic flow from the lower security level to all higher security levels, does it depends on NAT setup? If disable NAT, does firewall will allow traffic flow from the lower security level to higher security level which depends access-list permit setup?
PIX will not forward any traffic which does not have the corresponding translation entry. Unless and until the transaltion slot has not been created for the traffic, pix will not allow it to pass through.
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...
[toc:faq]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 and UDP are I...