Tag Archives: testing

Cisco Switch Wireshark Packet Capture

One of the most fundamental troubleshooting concepts in all of IT is to capture packets and review the data as it flows over the wire. Historically the easiest way to do this was to configure some type of SPAN port on a switch to copy the traffic to your pack capture device. With today’s less expensive and more powerful hardware it should come as no surprise that this functionality is now available on network hardware it’s self. Continue reading

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Link Runner AT 2000 Review

When trying to resolve network issues away from your desk there are many approaches that can be taken. Having the right tools for the job makes all the difference of course. Previously I have always just carried a laptop for this. As part of a larger project we were able to roll in a Flunk Link Runner AT 2000. I have been very pleased with it so far when troubleshooting the basic connectivity issues. The Link Runner AT 2000 is a simple and easy to use network troubleshooting tool. It features cable diagnostics, switch discovery features, and IP connectivity tests … Continue reading

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Power over Ethernet Issues

With the invention of Power over Ethernet (PoE) bringing up light devices such as VOIP phones and wireless access points has become very easy. Power and data flow over the same cable on various wire pairs. The simplicity is great but the electrical requirements are a bit more particular with PoE. With full Gigabit implementations all wire pairs are required for power and for data transmission. When one pair is not properly terminated strange things happen… Continue reading

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Create ACL Rules with Wireshark

I stumbled onto this wireshark feature by accident really but thought I would share a little bit about it. Essentially what wireshark does is allows you to review all the captured packets and then a single packet in more detail. Continue reading

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