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If you access the Net from home using a DSL or cable modem (CM) connection that is always on, you definitely need a firewall. Why? Well, most hacks on the Internet happen because of automated port scans: "robots" scanning the Internet . . .

Anthony Pell
Jul 15, 2001

CERT warns firewall leaves open door to attackers

A United States-based network security watchdog has warned of a security hole in firewall software that will give an attacker access to the system and could lead to a denial of service attack. An advisory from CERT overnight . . .

Anthony Pell
Jul 10, 2001

Firewall appliances back in vogue

Small and medium-size companies last year spent more money on hardware-based firewall appliances than on software-based systems, helping WatchGuard Technologies Inc. remain in the No. 1 position in the most competitive segment of the firewall market, according to a new analyst . . .

Anthony Pell
Jun 30, 2001

Firewalls not enough, says security vendor

Firewalls and intrusion detection systems need an extra layer of protection, according to a leading security vendor. Paul Lawrence, European technical director at Top Layer Networks, said it was crucial to build up a picture of the data traffic on . . .

Anthony Pell
Jun 28, 2001

Security: Firewalls; IPtables and Rules

First you need to know how the firewall treats packets leaving, entering, or passing through your computer. Basically there is a chain for each of these paths. Any packet entering your computer goes through the INPUT chain. Any packet that your . . .

Anthony Pell
Jun 18, 2001

Iptables Tutorial

I'm sure many of you have been wondering how to use iptables to set up a basic firewall. I was wondering the same thing for a long time until I recently figured it out. I'll try to explain the basics to at least get you started.. . .

Anthony Pell
May 31, 2001

Firewalling: Reject vs. Deny, Default-open vs. Default-closed

... there are a number of issues considered all too rarely by firewall administrators. Most IP level firewalls have a number of options for handling a packet. The packet can typically be accepted, dropped, or sent through another set of rules for inspection (allowing you to break up your ruleset into more manageable pieces). . .

Anthony Pell
May 23, 2001

Setting up a proxy server on Linux

Many people have heard the term proxy server but don't know how it can benefit them. We've all heard of firewalls, and we all know the value of a good firewall. Some of you might even be using a firewall proxy to make life easier. For those of you who are unaware of what a proxy server or firewall proxy is, let me first explain the concept, and then I'll show you how to set one up on Linux.. . .

Anthony Pell
May 16, 2001

Part 2: How to Set Up a Linux-Based Firewall for a SOHO

This is part 2 of a 3-part series on how you can quickly secure your system with a Linux-based SOHO firewall. In this segment, the author guides you through product selections for your particular needs and discusses hardware and software costs, . . .

Anthony Pell
May 14, 2001

DMZs for dummies

You've ordered a new firewall, and you want to get it running on your network ASAP. Your first reaction is probably to put every client and server behind it. That's fine for a small company, but a larger company should consider . . .

Anthony Pell
May 10, 2001

Tutorial: How to Set Up a Linux-Based Firewall for a SOHO

To assuage any fears, this article will show you how to set up a Linux-based personal firewall for the SOHO (small office, home office), broadband-attached network. It also takes a look at several SOHO firewalls and determines whether or not they . . .

Anthony Pell
Apr 30, 2001

Firewalls, VPNs, and Remote Offices

This month I will look at what we might call "best practices" for internetworking remote offices. It is arguably an old topic--we've been connecting remote offices over Virtual Private Networks (VPNs) for a few years now. It is one of the main purposes for VPNs, second only to secure dial-in connections. And yet, I think most of us do it wrong.. . .

Anthony Pell
Apr 24, 2001

Embedded Firewalls: The Next Wave?

Certainly your organization uses a firewall, most likely at your network borders. And many of you have adopted firewalls to protect your internal network segments, servers, and workstations. Most of these solutions are software-based-you must load that software on top of . . .

Anthony Pell
Apr 20, 2001

Security flaw in Linux 2.4 IPTables using FTP PORT

Firewalls using Linux Kernel 2.4.x with IPTables could potentially be compromised as a result of bad logic in the FTP PORT processing. "There is a security flaw in the manner in which the PORT command is interpreted and processed. Essentially, you . . .

Anthony Pell
Apr 17, 2001

Iptables Basics NHF

Anthony Pell
Apr 17, 2001

Considerations of a firewall: Part 1

If you're upgrading your firewall, or installing one on your network for the first time, you'll discover that firewall technology has changed a lot in the last several years. How do you select one that's appropriate for your business? Before you . . .

Anthony Pell
Mar 29, 2001

Remote users need firewalls too

Last December, a bank in Southern California received a call from an online customer asking why one of the bank's computers was trying to hack into his system. It turned out that the machine doing the hacking belonged to the bank's . . .

Anthony Pell
Mar 28, 2001

How to Build a FreeBSD-STABLE Firewall with IPFILTER

This howto walks you through the process of building one of the most stable and secure firewalls available - a FreeBSD-STABLE firewall with IPFILTER. As a part of the installation process, all services will be disabled except OpenSSH, which will have . . .

Anthony Pell
Mar 12, 2001

NetMAX FireWall worth the fickle installation

NetMAX FireWall from Cybernet Systems is a smooth-running, easily configurable firewall, if you can get past its annoying setup and installation. I'd like to mention some useful-looking features that I was unable to test. NetMAX FireWall includes a traffic monitor that . . .

Anthony Pell
Feb 22, 2001

Network Flight Instructions, Part II: Internet gateway configuration and basic online security rules

This part of the article gives an overview of ways to use your DSL machine as gateway for your home or office network, and goes through the basic steps to setup and maintain security to machines connected directly to the Internet. . . .

Anthony Pell
Feb 19, 2001

Firewall - Page 12

An Introduction to UFW, Ubuntu’s ‘Uncomplicated’ Firewall

The Open Source Firewall – IPFire 2.27 – Core Update 173 Released: What’s New?

IPFire Hardened Linux Firewall Distro Is Now Powered by Linux Kernel 6.1 LTS