Case of the Tired Firewall

Case of the Tired Firewall

Have you ever had a nightmare where you are being chased and you can't just seem to run away fast enough? No? Well, maybe you've tried running through snow up to your knees or swimming while wearing jeans. All of those examples point to situations that feel like something isn't quite right. Cases where there could be better performance if only something was changed or improved. Sometimes this same thing happens to network devices. In this example, it's the case of the tired firewall. Problem It was a typical day in the office with users milling about drinking coffee, others happily working, and some furiously pecking at their keyboards with deadlines looming. For a small segment of users, though, things weren't normal. They were staring at their monitors with looks of puzzlement and confusion. Instead of working on their latest application update they were running tests with varying and unusual results. They found several symptoms, but were unable to pinpoint the root...
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Capturing Light

Capturing Light

How do you go about catching the one of the fastest things known to man (light) at a specific point in time with pinpoint accuracy over and over again? With a little patience and your network card, of course! This post is an introduction to the process of capturing network traffic (aka "sniffing" or "tracing"). With most of my blog being dedicated to network performance analysis, a post like this is foundational, and will help you understand the basics moving forward if you are new to "sniffing the wire". Networks range in size from small home networks with 1 PC to global corporations with many users and data centers, to the largest network (or collection of networks depending upon your definition) of them all, the Internet. While size, speed, design, and costs may vary, they all use the same signals to communicate. These signals may take the form of electricity (ethernet cables), light (fiber), and radio waves (wireless) across varying mediums. These...
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