Network analysis and troubleshooting
This session was recorded at Sharkfest 2017 - June 19th at Carnegie Mellon University in Pittsburgh. It delves into the reasons why people blame the network for performance problems, why these issues linger, and how network engineers can solve them using Wireshark. I hope this helps you in …
[Read more...] about Sharkfest 2017 – Winning the Network Blame Game
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 give us …
[Read more...] about Troubleshooting with Wireshark – Filtering Out What You Don’t Need
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 …
[Read more...] about Troubleshooting with Wireshark – Finding Delays in TCP Conversations
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 …
[Read more...] about Wireshark – Spurious Retransmissions Explained
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 …
[Read more...] about Troubleshooting with Wireshark – Filtering on Intra-Subnet Conversations
Ever wonder where in the world IP conversations are coming from? In this video, we show how to configure and use the GeoIP feature of Wireshark. This allows us to get GPS coordinates for IP addresses in the trace files. https://youtu.be/VZUX0KwKRHY Here is the link to the MaxMind …
[Read more...] about Troubleshooting with Wireshark – Mapping IP Address Locations
