CloudShark Blog

Training, webinars, and resources for network analysis

Tuesday, Aug 7, 2018

Sharing Packet Capture Collections on CloudShark Online

Users of CloudShark Online can take captures they’ve uploaded and put them together in “collections”. Collections are great for matching up multiple captures that all have to do with the same topic or problem, and is ideal for educators and bloggers looking to use CloudShark captures in their classes and content. Better context makes for better analysis Like everything we build into CloudShark, we’re always surprised by new ways that people are using it.

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Monday, Aug 6, 2018

Getting started with packet analysis

There’s three questions we get asked the most here at CloudShark: How do I capture packets and get them into CloudShark? Where can I find example packet captures? Where do I start with packet capture analysis? That last question is very important to us, because one of the things we always want to promote is demystifying the use of packet captures to troubleshoot network and security problems. They are really are the best way, and with the right tools and knowledge they can be your first go-to.

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Monday, Jul 23, 2018

What is new with TLS 1.3 - some capture examples

In August of 2018, the Internet Engineering Task Force (IETF) moved Transport Layer Security (TLS) Version 1.3 to RFC 8446. In the world of networking standards, this means it has been properly vetted by the community and is officially ready for showtime on clients and servers. About these captures We're able to look at TLS 1.3 handshakes thanks to support for the protocol in tshark 2.6. CloudShark 3.5 and later versions have support for TLS 1.

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Monday, Jul 9, 2018

Packet capture on VMware virtual machines using vmnet-sniffer

One of the most powerful tools we use when testing CloudShark is a combination of VMware Workstation and the Vagrant API interface. With Vagrant, we can test every permutation of CloudShark via a barrage of automated testing. Along the way, we had to learn some of the lower level interfaces of these tools. We became aware of a vmnet-sniffer command that comes with VMware Workstation and VMware Fusion, which we use on our OS X workstations for development, and realized that it’s a great tool for capturing on virtual machines or in a cloud environment when used with CloudShark for analysis.

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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 public and private IP addresses and witness its DNS requests.

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About Us

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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