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Building a powerful & affordable firewall with Linux

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It's no doubt that one of the leaders for network equipment is Cisco Systems. Newer Cisco devices are starting to use what Cisco calls its "IOS-XE" operating system, which is a customized flavor of GNU/Linux. Yes, GNU/Linux, which should not come as any surprise as GNU/Linux is used on countless high level appliances and security devices.

Dave Wreski
Oct 20, 2011

IPFire open source firewall gets ARM port

The IPFire project development team has announced the first beta release of an ARM port of version 2.11 of its open source firewall. IPFire is a Linux server distribution that can be booted from a CD or USB drive, or installed to a computer's internal drive.

Anthony Pell
Oct 11, 2011

Build Powerful Linux Firewalls with Firewall Builder

Fwbuilder is a unique graphical firewall tool that allows the user to create objects and then drag and drop those objects into firewalls, to build a powerful security system for a single PC or a network of PCs. Fwbuilder supports a wide range of firewalls (Cisco ASA/PIX, Linux iptables, FreeBSD's ipfilter, OpenBSD's pf, and more), so its rules can be deployed on multiple platforms.

Alex
Apr 19, 2011

Hacker 'Handshake' Hole Found In Common Firewalls

Some of the most commonly-used firewalls are subject to a hacker exploit that lets an attacker trick a firewall and get into an internal network as a trusted IP connection.

Dave Wreski
Apr 13, 2011

Facebook and web apps threaten network security

Traditional firewalls might not be enough, argues Palo Alto Networks founder Nir Zuk. The world is very different from the days when email ruled the roost and Yahoo, not Google, was the first search engine name that rolled off your tongue.

Anthony Pell
Feb 21, 2011

2011 tech priorities: Moving to a next-generation firewall

What should enterprises expect if they want to make the transition from a traditional firewall to a next-generation firewall? It starts with a decidedly different way of thinking about security goals associated with a firewall, especially in terms of establishing application-aware controls over employees as they access the Internet, the Web and social networking sites. (See Unbatten the hatches.)

Alex
Jan 03, 2011

Review: Firewall operations management

Anyone running multiple firewalls in a complex, enterprise environment knows how difficult it can be to catch misconfigurations, avoid conflicting rules, identify vulnerabilities and meet auditing and compliance mandates.

Alex
Jul 12, 2010

Talking with a Forbes blogger about firewalls

This is the second of two parts of an interview with Daniel Kennedy, MSIA, who graduated from the Master of Science in Information Assurance program in the School of Graduate Studies of Norwich University in 2008. He has recently become a contributor to an interesting, thoughtful and valuable blog at Forbes Online and I interviewed him recently about his new project.

Alex
Jun 01, 2010

Firewall audit dos and don'ts

Firewall audit products are maturing, but the product class is still a relatively young, small market, defined by compliance requirements. You have a fairly limited choice of vendors, including Tufin Software Technologies, AlgoSec, Secure Passage and Athena Security, which all come with firewall audit pedigrees, and RedSeal Systems and Skybox Security, which are primarily vendors of risk-mitigation tools, and so go beyond firewall audit to feature sophisticated risk-assessment and risk-management capabilities.

Alex
May 12, 2010

Firewall audit tools : features and functions

Firewall audit tools automate the otherwise all-but-impossible task of analyzing complex and bloated rule sets to verify and demonstrate enterprise access controls and configuration change-management processes.

Alex
May 11, 2010

iScanner

iScanner is free open source tool lets you detect and remove malicious codes and web pages viruses from your Linux/Unix server easily and automatically. This is a neat tool for those who have to do some clean up operation after a mass-exploitation or defacement on a shared web-host.

Anthony Pell
May 11, 2010

iptables rules for desktop computers

Today I will show you the iptables rules I set on my main personal computer, with detailed comments about why I came to use these rules after several years of Linux desktop usage. The rules I use now have been simplified as much as I could and are based on common rules and advice that can be found on the network and also on input I got from experienced network administrators. I

Anthony Pell
Apr 06, 2010

Flint

Flint examines firewalls, quickly computes the effect of all the configuration rules, and then spots problems so you can: CLEAN UP RUSTY CONFIGURATIONS that are crudded up with rules that can

Anthony Pell
Mar 26, 2010

Port Knocking

Fred Stluka from Bristle.com just introduced me to port knocking -- a method of opening ports on a firewall by trying to connect with a series of ports in a pre-determined order. The sequence of "knocks" acts like a secret access code -- like tapping out the first couple of bars from your favorite song to tell someone inside that it's you.

Anthony Pell
Mar 03, 2010

Iptables Limits Connections Per IP

ow do I restrict the number of connections used by a single IP address to my server for port 80 and 25 using iptables? You need to use the connlimit modules which allows you to restrict the number of parallel TCP connections to a server per client IP address (or address block). This is useful to protect your server or vps box against flooding, spamming or content scraping.

Anthony Pell
Feb 11, 2010

Hacker pierces hardware firewalls with web page

On Tuesday, hacker Samy Kamkar demonstrated a way to identify a browser's geographical location by exploiting weaknesses in many WiFi routers. Now, he's back with a simple method to penetrate hardware firewalls using little more than some javascript embedded in a webpage.

Anthony Pell
Jan 07, 2010

DIY pfSense firewall system beats others for features, reliability, and security

With the prevalence of

Anthony Pell
Dec 07, 2009

Hitting a Wall: the Great UTM Challenge

In the beginning was the firewall, and it was pretty good. A big box of rules that sat between your network and the evils of the Internet, the firewall examined ports and protocols to decide which packets got in and which were barred at the door. Then things got, as things often do, complicated. New threats came sneaking in on trusted protocols, ports and protocols became tangled, and looking inside packets became just as important as noting their source, destination, and type.

Anthony Pell
May 27, 2009

5 Best Linux/BSD Firewall Tools

Over the course of recent years, some people have found the quality of most out-of-the-store firewall appliances either lacking functionality or worse, set at a price that has made them generally out of reach. Because of this issue, I thought it would be beneficial to write an article to better highlight what works and what does not with regard to turning an older PC into a standalone router/firewall appliance. What do you think about this list of firewall tools? Did they miss anyones that should be on it?

Bill Keys
Dec 19, 2008

OSF - Passive OS Fingerprinting For IPtables

Passive OS fingerprinting netfilter module allows to passively detect remote OS and perform various netfilter actions based on that knowledge. This module compares some data (WS, MSS, options and it's order, ttl, df and others) from packets with SYN bit set with dynamically loaded OS fingerprints. Starting from 2008_07_01 version OSF works only with Xtables, so you have to upgrade to recent kernels (and ename xtables support) and iptables (tested with 1.4.1.1). Also note, that Debian (starting from Lenny) has serious problems with iptables-dev package, which does not contain needed headers, so better install iptables from sources. Have you ever hear about a netfilter module that does passive OS fingerprinting? If you are interested in learning more about this check out this article.

Bill Keys
Dec 09, 2008

Firewall - Page 2.2

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