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June 22, 2017
Are My Packets Lying? Four Things To Look For

Packets don’t lie – well, most of the time. They tell the truth unless they have been captured incorrectly. In those cases, packets can tell bold-faced lies. When digging through trace files, we can come upon symptoms in the packets that may raise an eyebrow. These are events that look strange on the surface and […]

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June 5, 2017
Troubleshooting with Wireshark - Filtering Out What You Don't Need

  Sometimes packet digging can get tedious. We've all been there. It can be hard to set the right filter that lets us hone in on the root cause. In many cases, it is just as helpful to remove protocols from view that are not probably not related to the problem. At least that will […]

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May 30, 2017
Got NetFlow and Metadata – Why do I need packets?

It’s all about time. When it comes to network monitoring, NetFlow and Metadata-based tools allow engineers to get a handle on traffic usage, statistics, capacity, and even security attacks. They quickly help us visualize the conversations and applications involved in congestion, as well as hone in on strange traffic behavior. It would be difficult (and […]

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March 29, 2017
Troubleshooting with Wireshark - Finding Delays in TCP Conversations

The delta time column has always been one of the first things to add when configuring Wireshark. It shows the time between displayed packets, or captured packets, depending on how you set it up. It makes finding delays in conversations much easier to do - that is unless you are dealing with a trace file […]

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March 13, 2017
Wireshark - Spurious Retransmissions Explained

What is the difference between a regular retransmission and a spurious one? What can I do about them if I find them in a trace file? Spurious retransmissions are not uncommon. They find their way into our trace files somewhat often. In this video, we explain the differences in retransmission flavors, as well as examine […]

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March 1, 2017
Troubleshooting with Wireshark - Filtering on Intra-Subnet Conversations

In most cases, clients are talking to servers to support services requested by users. We typically should not see clients communicating directly with other clients on our subnets, unless there is some file sharing or other type of expected activity. In this video, we will look at how to filter for intra-subnet conversations - clients […]

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