CloudShark Blog

Training, webinars, and resources for network analysis

Thursday, Jun 21, 2018

Leaking sensitive data while using VPNs

People use Virtual Private Networks (VPNs) for a number of reasons, mostly for enterprise work where it’s necessary to be connected to a company’s network resources when working remotely. Others use them to ensure their network activity is private, using a secure connection to a VPN service. In the latter case, however, a misconfigured VPN setup can cause certain information to remain unsecured, allowing an observer to learn a user’s pubic and private IP addresses and witness its DNS requests.

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Tuesday, Jun 5, 2018

Using filters for navigation and sharing

CloudShark’s display filters are 100% compatible with the Wireshark filters used in packet analysis. With CloudShark, they present a new opportunity for use when sharing your captures with colleagues in order to both present the view you are looking at, or to help navigate to a section of the capture you want them to see. Here’s some tricks we use when getting around town in CloudShark. Filter based on capture content If you know there’s something in the capture you’re looking for immediately, and you want others to see what you’re thinking, you can use the filter ‘frame contains’ to search for a literal string that exists in the capture.

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Tuesday, May 29, 2018

What are some easy to use packet capture tools?

A common question we get other than where to find example packet captures is which packet capture tools exist that are either free, work in a command line, work directly with CloudShark, or all of the above. Here’s a list of our go-to capture tools (other than Wireshark of course) and the different scenarios in which they can be used. tshark About ring buffers CloudShark is made to work with capture files directly.

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Monday, May 7, 2018

The effects of traffic bursts on network hardware

We’ve written extensively about the phenomenon of network microbursts and how to use the iPerf network performance tool to create them in order to test their effects on your network. Our interest in them grew out of our work with Velocimetrics, since microbursts can have pretty significant effects in financial/trade markets. Our journey down the rabbit-hole got us interested in seeing the effects of microbursts on switches and interfaces in a test network.

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Monday, Apr 30, 2018

How do you test microburst effects using iPerf?

Bursty traffic, particularly microbursts, are an often overlooked phenomenon that can cause serious issues with network performance. We’ve explained before what microbursts are and what they look like, but how can you use existing tools to test your network’s reliability in the presence of microbursts? How can I test network throughput? iPerf is one of the most commonly used tools to test network throughput. From their site: iPerf3 is a tool for active measurements of the maximum achievable bandwidth on IP networks.

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CloudShark is made by QA Cafe, a technology company based in Portsmouth, NH. Our passion for packet captures has grown out of our other product CDRouter.

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