LinuxSecurity.com
Share your story
The central voice for Linux and Open Source security news
Home News Topics Advisories HOWTOs Features Newsletters About Register

Welcome!
Sign up!
EnGarde Community
Login
Polls
What is the most important Linux security technology?
 
Advisories
Community
Linux Events
Linux User Groups
Link to Us
Security Center
Book Reviews
Security Dictionary
Security Tips
SELinux
White Papers
Featured Blogs
All About Linux
DanWalsh LiveJournal
Securitydistro
Latest Newsletters
Linux Advisory Watch: December 12th, 2014
Linux Security Week: December 9th, 2014
Subscribe
LinuxSecurity Newsletters
E-mail:
Choose Lists:
About our Newsletters
RSS Feeds
Get the LinuxSecurity news you want faster with RSS
Powered By

  
de.comp.security.firewall FAQ Print E-mail
User Rating:      How can I rate this item?
Source: Lutz Donnerhacke - Posted by Benjamin D. Thomas   
Firewalls A firewall is an organizationally and technical concept for the separation of networks, its correct implementation and constant maintenance. One piece that's often used is a piece of hardware that connects to networks the way as it's allowed in the concept. This piece of hardware is often called firewall-system/computer or in short firewall.

How does a typical technical implementation of a firewall look like?

First you put a packetfilter between the directly connected networks (network 1 -- packetfilter -- perimeter network -- packetfilter -- network 2). The packetfilters only allow traffic from the directly attached networks. A connection from one network to the not directly attached packetfilter or the other network is strictly forbidden.

The perimeter network is also known as DMZ (Demilitarized Zone). In it there are switching computers for all protocols/services who should work from one net to the other net. Such a switching computer is also known as Proxy, because it works pro procurationem/by proxy (like a secretary). Proxies work on application level, means they understand the communi

Read this full article at Lutz Donnerhacke

Only registered users can write comments.
Please login or register.

Powered by AkoComment!

 
< Prev   Next >
    
Partner

 

Latest Features
Peter Smith Releases Linux Network Security Online
Securing a Linux Web Server
Password guessing with Medusa 2.0
Password guessing as an attack vector
Squid and Digest Authentication
Squid and Basic Authentication
Demystifying the Chinese Hacking Industry: Earning 6 Million a Night
Free Online security course (LearnSIA) - A Call for Help
What You Need to Know About Linux Rootkits
Review: A Practical Guide to Fedora and Red Hat Enterprise Linux - Fifth Edition
Yesterday's Edition
University of California, Berkeley Hacked, Data Compromised
London teen pleads guilty to Spamhaus DDoS
New England security group shares threat intelligence, strives to bolster region
Partner Sponsor

Community | HOWTOs | Blogs | Features | Book Reviews | Networking
 Security Projects |  Latest News |  Newsletters |  SELinux |  Privacy |  Home
 Hardening |   About Us |   Advertise |   Legal Notice |   RSS |   Guardian Digital
(c)Copyright 2014 Guardian Digital, Inc. All rights reserved.