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Securing Linux Systems: Host-Based Firewalls and Iptables Configuration

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This article provides information and recommendations for securing Linux operating systems with host-based firewalls. This article aims to provide readers with a template for constructing a host-based firewall that provides a useful layer of protection against the risks of exposing a system to internal and/or external users. Additionally, readers can gain an understanding of construction methods for host-based firewalls in general and Linux-based firewalls in particular. This article targets an intermediate audience. . . .

Anthony Pell
Jan 30, 2004

Discover Linux Firewalls To Strengthen IT Infrastructure Security

For a few days in NYC, LinuxWorld is the center of the open source universe. In keeping with that spirit, we examine some AO member recommendations on firewalls based on the open-source OS. Whether it's used to power complex datacenters or breathe new life into aging machines, Linux has undoubtedly established itself as a formidable IT presence. . . .

Anthony Pell
Jan 23, 2004

Assessing Security Risks for Consumer Firewalls in Home and Business

With the growing demand for always-on high-speed Internet access, consumer-grade firewall boxes are becoming as common in computing as modems and mice. The prevalence of these devices makes sense, as network security and protection against intruders have become topics of great concern for home-office telecommuters as well as for IT staff in upscale corporations. . . .

Anthony Pell
Jan 14, 2004

Fwall 1.4-2: Easy Bash Firewall for Port Forwarding and DoS Protection

fwall is a simple user-friendly firewall script for iptables. It is based on bash. It includes a configuration for 1-2 interfaces, port forwarding, DoS protection, and so on. . . .

Anthony Pell
Dec 29, 2003

Exploring Multilayer Firewall Strategies for Comprehensive Protection

There is a common misconception that you can protect all assets with only a firewall. Find out why every organisation must consider a multilayer approach along with the firewall to protect all its assets While firewalls can secure Internet access, protect . . .

Anthony Pell
Dec 17, 2003

Lloyd Moves to Astaro Security Linux for Better Network Security

Facing a time-consuming and expensive upgrade process, Lloyd found an ideal solution: he turned to an all-in-one security product. Lloyd set up his own network at home where he downloaded a free 30-day trial of Astaro Security Linux. "To meet my . . .

Anthony Pell
Dec 16, 2003

Remote Access Security: SSL and IPSec Technology Impact

When a VPN does its job correctly, remote users don't notice it's there. Packets move from site to site, user to user. Encryption algorithms scramble the data and then safely unscramble it at the other end. Information flows. Work gets done.. . .

Anthony Pell
Dec 10, 2003

Home User Security: Essential Personal Firewalls and Outbound Filtering

Firewalls play a crucial role in network and computer security. Part I of this series, Home User Security: Your First Defense, examined the typical functions of firewalls and how they can be of use on an individual level. More specifically, the . . .

Anthony Pell
Dec 09, 2003

VPN and Firewall Market Revenue Sees 9% Growth in Q3 of 2003

Worldwide VPN and firewall hardware and software revenue grew 9% to $780 million between 2Q03 and 3Q03, and will reach $955 million by 3Q04, according to Infonetics Research's quarterly worldwide market share and forecast service, VPN and Firewall Products. By 2006, . . .

Anthony Pell
Dec 09, 2003

Enhance Security With Nufw's User-Level Packet Filtering

Nufw brings the concept of users into IP packet Filtering. This is a set of daemons that permit to filter packets on a per-user basis. The gateway authorizes a packet depending on which remote user has sent it. On the client . . .

Anthony Pell
Dec 08, 2003

Firewall Builder 1.1 Overview: Enhance Your Network Protection

Firewall Builder consists of an object-oriented GUI and a set of policy compilers for various firewall platforms. In Firewall Builder, a firewall policy is a set of rules; each rule consists of abstract objects that represent real network objects and services . . .

Anthony Pell
Nov 26, 2003

Understanding Firewall Logs and Port Numbers for Better Security

This document explains what you see in firewall logs, especially what port numbers means. You can use this information to help figure out what hackers/worms are up to. This document is intended for both security-experts maintaining corporate firewalls as well as . . .

Anthony Pell
Nov 19, 2003

Lutel's Firewall 0.72: Robust IPtables and NAT Solution for Home Networks

Lutel's Firewall Script is a Linux IPtables shell script written in bash for use as a firewall and NAT/masquerade router for home networks or multiple subnets applications. It shares access to a internet connection from multiple workstations. It makes use of . . .

Anthony Pell
Oct 30, 2003

Ahorro Corporación Enhances Security with Linux and StoneGate Integration

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

Reassessing Port Management: Enhancing Security Against Virus Attacks

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

Exploring Transparent Firewalls For Enhanced Network Security

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

Step-By-Step Guide To Building A 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

Assessing Firewall Necessity for Dial-Up Users and Broadband Connections

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

Effective Kazaa Traffic Blocking Using P2PWall on IPTables Firewalls

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

Exploring Firewall Innovation and Deep Packet Inspection Benefits

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

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Linux Firewall - Page 8

UFW in Linux: Why Firewall Issues Repeat and How to Recognize Them

Managing Unintended Exposure from UFW Application Profiles in Linux

Comprehensive Guide to Troubleshooting Linux UFW Firewall Issues