Networking

Low Power Wireless: 6LoWPAN, IEEE802.15.4 and the Raspberry Pi

The Internet of Things (IoT) is one of the new kids on the block. It promises connection of sensors and actuators to the internet, for data to flow both ways, and once on the internet, to become part of new and exciting business systems, reaching up into the realms of big data and artificial intelligence.

VMKings' VPS Hosting Solution

The management team of cloud provider VMKing, as developers themselves, found standard virtual servers not to be well tailored to the developer community—too much or too little space, insufficient security and no support for their preferred Linux OS(!).

smbclient Security for Windows Printing and File Transfer

Microsoft Windows is usually a presence in most computing environments, and UNIX administrators likely will be forced to use resources in Windows networks from time to time. Although many are familiar with the Samba server software, the matching smbclient utility often escapes notice.

Hodge Podge

For every article, I try to write something that is interesting, entertaining, educational and fun. Sometimes I even succeed. Many other times I have some things I'd like to talk about, but there's not enough of it to fill the space. This time, I decided a disjointed hodge podge would be the theme. So let's just have a virtual nerdy talk about stuff, shall we?

Understanding Firewalld in Multi-Zone Configurations

Stories of compromised servers and data theft fill today's news. It isn't difficult for someone who has read an informative blog post to access a system via a misconfigured service, take advantage of a recently exposed vulnerability or gain control using a stolen password.

SNMP

How would you find out how much RAM is free on your Linux desktop? That's a really easy question with a lot of answers—free, any of the implementations of top and Glances all are valid responses.

Papa's Got a Brand New NAS

It used to be that the true sign you were dealing with a Linux geek was the pile of computers lying around that person's house. How else could you experiment with networked servers without a mass of computers and networking equipment? If you work as a sysadmin for a large company, sometimes one of the job perks is that you get first dibs on decommissioned equipment.

Applied Expert Systems, Inc.'s CleverView for TCP/IP on Linux

One of the most important characteristics of the contemporary data center, notes Applied Expert Systems, Inc. (AES), is that an ever-increasing amount of the traffic is between servers. Realizing the resulting need to facilitate improved server-to-server communications, AES developed CleverView for TCP/IP on Linux v2.5 with KVM Monitoring.

The Tiny Internet Project, Part III

In a previous article, I introduced the Tiny Internet Project, a self-contained Linux project that shows you how to build key pieces of the internet on a single computer using virtualization software, a router and free open-source applications.

The Peculiar Case of Email in the Cloud

Most of the time when I start a project, or spin up a virtual server, it's done in my own basement "server farm". Not too many years ago, if I wanted those services to be public, I'd simply port-forward from my static IP into my personal machines. Or, perhaps I'd set up a name-based virtual host as a reverse proxy if I needed to expose a Web app.

Varnish Software's Hitch

Making life easier for the 2.2 million Web sites that deploy the Varnish Cache HTTP engine is the point of Hitch from Varnish Software.

Build a Large-Screen Command Center with the RPi 2

When the folks who make the Raspberry Pi made good on their plan to release a multi-core version of the tiny computer with 1GB of RAM earlier this year, I saw it as the perfect opportunity to put the single-board Linux box to work—real work—in our company's network operations center.

Securi-Pi: Using the Raspberry Pi as a Secure Landing Point

Like many LJ readers these days, I've been leading a bit of a techno-nomadic lifestyle as of the past few years—jumping from network to network, access point to access point, as I bounce around the real world while maintaining my connection to the Internet and other networks I use on a daily basis.

Roll Your Own Enterprise Wi-Fi

As you can tell by my Wi-Fi focus in The Open-Source Classroom this month, I really love wireless networking. I've implemented wireless solutions for schools on a shoestring budget, and I've helped plan campus-wide rollouts of redundantly controlled enterprise solutions.