More specialty Linuxes to the rescue

Whether your focus is security, storage, music, or religion, there's a flavor of Linux that fits the bill

The day of the mold-your-own OS has come, and Linux is the clay.

Linux provides free and open access to the source for the OS itself. Developers are free to tailor a custom Linux -- even down to the level of the kernel itself. You can trim away drivers, services, and other OS components unneeded by the task for which the custom distribution will be targeted.

In addition, because Linux thrives on a universe of free software, developers can be choosy about the pre-installed packages they supply with their custom system. One can easily construct a user environment tuned to a specific application.

The specialized Linuxes in this roundup showcase the advantages of customizing both OS components and user-level software. I look at a pair of firewall Linuxes, IPCop and m0n0wall; a Linux SAN/NAS appliance, OpenFiler; two Linuxes for musicians, Ubuntu Studio and Musix; and a final duo of distributions, Ubuntu Christian Edition and Ubuntu Muslim Edition, targeted at members of those corresponding religions.

IPCop

The firewall system IPCop is a fork of SmoothWall Linux (now called SmoothWall Express), which, in turn, is based on Red Hat Linux. The most recent releases of IPCop, however, have been created via LFS (Linux From Scratch).

On a typical Linux system, your interaction with the OS is either through an X-Windows based graphical desktop or a text-based shell. Not so with IPCop. Once started, it launches a Web server, which IPCop uses to host a management GUI. The first time you boot IPCop and enter the management GUI, you must configure the topological details of the intranet that IPCop will protect.

IPCop partitions your network into three color-coded zones. The Green zone is the most secure: IPCop insulates devices on the Green zone from all other zones. Green zone devices must be connected to the IPCop server via hardwired network connections. The next outward ring of protection is the Blue zone, which consists of wireless network devices. Blue zone devices are also insulated by IPCop's firewall system, but because this zone admits wireless access, it is necessarily less secure than the direct-wired Green zone. The outermost security ring is the Orange zone, which is that part of the local network exposed to the wider internet. The "outside world" is actually its own zone: Red. Naturally, Red zone traffic is completely uncontrolled by IPCop. Each zone attaches to the IPCop server through a dedicated Ethernet card. (A minimal IPCop system will have a Red zone and a Green zone.)

Web traffic can pass only from less secure to more secure zones through tightly controlled channels referred to as "pinholes." Basically, a pinhole is a set of rules (configured in the management console) that determines which packets are permitted into zones of higher security. Typically, the rules allow packets to be delivered to specific ports on specific machines in the secure zone. The underlying packet-routing decision-making in IPCop is performed by the iptables Linux application.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags Linux

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Rick Grehan

InfoWorld
Show Comments

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Luke Hill

MSI GT75 TITAN

I need power and lots of it. As a Front End Web developer anything less just won’t cut it which is why the MSI GT75 is an outstanding laptop for me. It’s a sleek and futuristic looking, high quality, beast that has a touch of sci-fi flare about it.

Emily Tyson

MSI GE63 Raider

If you’re looking to invest in your next work horse laptop for work or home use, you can’t go wrong with the MSI GE63.

Laura Johnston

MSI GS65 Stealth Thin

If you can afford the price tag, it is well worth the money. It out performs any other laptop I have tried for gaming, and the transportable design and incredible display also make it ideal for work.

Andrew Teoh

Brother MFC-L9570CDW Multifunction Printer

Touch screen visibility and operation was great and easy to navigate. Each menu and sub-menu was in an understandable order and category

Louise Coady

Brother MFC-L9570CDW Multifunction Printer

The printer was convenient, produced clear and vibrant images and was very easy to use

Edwina Hargreaves

WD My Cloud Home

I would recommend this device for families and small businesses who want one safe place to store all their important digital content and a way to easily share it with friends, family, business partners, or customers.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?