Network analysis and troubleshooting
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
This video shows a common display filter that can be used in Wireshark to filter for slow web transactions to a server. Using this filter, you can quickly isolate slow application responses, which helps to get the blame off the network and into the right place. Enjoy! …
[Read more...] about Troubleshooting with Wireshark – Analyzing Slow HTTP Applications
This case study shows how we dug into a problem where a client had intermittent connectivity to the internet. Some applications worked while others did not. It affected all users in a small office. The capture file showed several TCP resets. What did they tell us? What were the next steps? What …
[Read more...] about Troubleshooting With Wireshark – Analyzing TCP Resets
After installing Wireshark, there are a few basic things that can be configured before starting analysis. In this short video, we cover configuring a profile, toggling packet coloring, basic display filters, and adding a delta time column. These basic things can go a long way in reading and …
[Read more...] about Getting Started With Wireshark – Initial Setup
