CloudShark Blog

Training, webinars, and resources for network analysis

Tuesday, Oct 9, 2018

How to Identify and Analyze BitTorrent Alerts in Your Network

Tracking down BitTorrent activity with packet captures We love the exercises at malware-traffic-analysis.net, and occasionally we’ll pick some that we try to solve using CloudShark and its tools. This time however, we’re going through one armed with tools that we learned from Brad’s class (the author of malware-traffic-analysis) at Sharkfest US 2018, where he gave an in-depth class on using packet captures for malware analysis, as well as a presentation on Analyzing Windows malware traffic.

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Monday, Sep 24, 2018

A Fast Analysis of TCP Fast Open

Part 3 of our series exploring TCP examines the TCP “Fast Open” option and what to look for when troubleshooting TCP Fast Open (TFO) is an optional mechanism within TCP that lets endpoints that have established a full TCP connection in the past eliminate a round-trip of the handshake and send data right away. This speeds things up for endpoints that are going to keep talking to each other in the future and is especially beneficial on high-latency networks where time-to-first-byte is critical.

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Monday, Sep 10, 2018

Using CloudShark to ensure HIPAA privacy compliance

Network packet captures present an interesting problem for HIPAA compliance, but they don’t have to be one that causes headaches. When it comes to securing electronic assets, packet captures are often overlooked more than other network and IT related resources. This is because they tend to be esoteric - compliance officers don’t need or want to have packets on their minds. Also, the methods through which they are obtained trend towards creating local, unaccountable copies of the traffic going over your network.

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Tuesday, Aug 28, 2018

The TCP Timestamp Option

We’re on a mission to tackle TCP, take it apart, and learn more about how it makes the internet work. Sample Captures Ahead! As always, we've gathered up the captures mentioned in this article into this collection over on CloudShark Did you know you can make collections just like this with CloudShark too? Learn more... Sample Captures Ahead! As always, we've gathered up the captures mentioned in this article into this collection over on CloudShark Did you know you can make collections just like this with CloudShark too?

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Monday, Aug 20, 2018

TCP Window Scaling

How Window Scaling keeps TCP moving at top speed Protocol choices made in older internet standards don’t scale to today’s network speeds. TCP (Transmission Control Protocol) has been making networks go for a very, very long time. As with many of the early internet protocols, limitations that seemed reasonable then can have a negative effect on performance now. Protocol designers allowed for future options to augment existing fields in order to keep them working effectively into the future.

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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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