Does anyone know how to prevent people from knowing my Internal IP addresss on the Router ? I have created ACL deny all TCP traffic to my internal Network and applied it to Out Side Interface on the router. But it seems there is a program to find out your internal IP basing on header or something.
access-list 101 deny tcp any 172.16.0.0 0.0.255.255
You can use NAT to translate your source IP into a different IP. So your 172.16.0.0 network can look like 10.0.0.0. The create your acl to deny whatever you want (example all traffic originated on the outside and only allow return traffic to what your inside lan originated).
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...