Firewall - Page 8 - Results from #140

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Banking on Reliable Security

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As part of the 'shake up' in its security system, Ahorro Corporación decided to change the platform for its applications and choose to invest in Linux. This meant that the firewall would also have to run with Linux. The StoneGate firewall . . .

Anthony Pell
Oct 28, 2003

Port-Blocking Isn't Enough For Security

As a result of the recent onslaught of Internet-based virus attacks and their effect on many companies' operations, some organizations responded defensively by shutting down TCP ports that were vulnerable. Unfortunately, many quickly learned that other essential business applications relied on . . .

Anthony Pell
Oct 22, 2003

Transparent, Bridging and In-line Firewall Devices

There are many tools we use as network and security professionals to build a secure network. Routers, virtual private networks, intrusion detection systems and vulnerability scanners are regularly employed to tackle this challenging task. Many would agree that the foundation of . . .

Anthony Pell
Oct 16, 2003

Roll Your Own Firewall with Netfilter

Every self-respecting Linux guru should be familiar with firewalls and how to install and configure them. With this in mind, Linux gurus also should be curious about how firewalls function and how to build a firewall of his or her own. . . .

Anthony Pell
Oct 13, 2003

Firewall may be excessive protection for dial-up users

This could be because the ISP has its own firewalls in place, and, in any event, the peril is far less for telephone modem users than for folks with high-speed, or broadband, connections via cable modem, digital subscriber line and such. . . .

Anthony Pell
Sep 29, 2003

Blocking Kazaa traffic with Linux/IPTables firewall.

The "p2pwall" project has developed a GPL add-in for iptables based firewalls that allows blocking of traffic to and from "Fast-Track" software such as "Kazaa", Kazaa-lite, iMesh and grokster. The software is designed for use in "permissive" firewall configurations where . . .

Anthony Pell
Aug 29, 2003

Firewall Evolution - Deep Packet Inspection

Firewalls provide a variety of services to networks in terms of security. They provide for network address translation (NAT), virtual private networks (VPN), and filtering of traffic that does not conform to the network's stated security policy. There are many forms . . .

Anthony Pell
Jul 30, 2003

Peering Over the Firewall

When our home LAN graduated to a 24x7 Internet connection, my Linux box became the firewall and the router. I liked the ability to customize the firewall, and by using Snort I could keep an eye on the barbarians at the . . .

Anthony Pell
Jul 24, 2003

A Quick View at Proxy's

Proxy servers were originally developed to cache frequently accessed web pages for computersbehind a common Internet connection. In the early days of the Internet, wide area links were veryslow, the Web was relatively small, and web pages were static. The entire . . .

Anthony Pell
Jul 21, 2003

Linux Firewall-related /proc Entries

Most people, when creating a Linux firewall, concentrate soley on manipulating kernel network filters: the rulesets you create using userspace tools such as iptables (2.4 kernels,) ipchains (2.2 kernels,) or even ipfwadm (2.0 kernels). However there are kernel variables -- . . .

Anthony Pell
Jul 15, 2003

Understanding Firewalls

There are literally hundreds of firewall products available, and there are different theories from different security experts on how firewalls should be used to secure your network. This article will explore the operation of a generic firewall in detail, outline the important features you need in a firewall, and discuss how firewalls should be deployed in networks of any size.. . .

Anthony Pell
Jul 11, 2003

Book Review: Personal Firewalls for Administrators and Remote Users

From the title it may seem that Personal Firewalls for Administrators and Remote Users was written for administrators and users of business networks. However, as more people take advantage of "always on" Internet connections, they are becoming de facto administrators. Remote . . .

Anthony Pell
Jul 07, 2003

Distributed Port Scanning Using OpenBSD's packet filter

Ste Jones submits By using openBSD's packet filter pf one can utilize the NAT address pools added into OpenBSD 3.3 to aid in distributed port scanning. As the text explains NAT can be used in a large network . . .

Anthony Pell
Jul 02, 2003

Open Source Firewalls Explained

Hackers have computers too and want to keep their own machines free of intrusion from the Internet. Paradoxically, these computers may be the most secure computers on the Internet, because the hackers use free software that they can examine for security . . .

Anthony Pell
Jul 02, 2003

OpenBSD Packet Filter Ported to NetBSD

NetBSD's itojun has ported PF (openbsd packet filter) to netbsd-current as of today as a patch. He says that presently it does not support (interface) syntax and ip_off/ip_len endian flipping needs testing. His ultimate goal is to replace ipsec policy engine . . .

Anthony Pell
Jun 27, 2003

TCP/IP Connection Cutting on Linux Firewalls and Routers (Introducing "Cutter 1.02")

Network security administrators sometimes need to be able to abort TCP/IP connections routed over their firewalls on demand. This would allow them to terminate connections such as SSH tunnels or VPNs left in place by employees over night, abort hacker attacks . . .

Anthony Pell
Jun 25, 2003

RIP Linux Router Project

It seems as though the operating system that helped to create the embedded Linux marketplace, the Linux Router Project (LRP), is dead. The website provides more details. . .

Anthony Pell
Jun 23, 2003

Best Firewalls for the Enterprise

How important is a firewall's throughput? According to Check Point Technologies' Mark Kraynak, price performance -- the amount of throughput an enterprise gets versus the dollars it spends -- is more important than top-end throughput.. . .

Anthony Pell
Jun 19, 2003

Best Firewalls for Small Businesses

Firewalls are the cornerstone of Internet security, and for small businesses that might not have in-house security expertise, shopping for one can be difficult. But without a firewall, no one in an organization should be accessing the Internet. How do . . .

Anthony Pell
Jun 18, 2003

Building Firewalls with iptables, Part 2

Last week in Part 1 we began uncovering some of the mysteries of tables and chains, and how to build iptables rules. This week we will dig more into writing rules for basic firewalling, sharing an Internet connection, and scripting. . .

Anthony Pell
Jun 16, 2003

Firewall - Page 8

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