Author Archives: acastaner

About acastaner

I'm a Business Development Engineer at Spirent, specialized in Layer 4-7 testing, Virtualization and Automation.

Harhar is now open source!


Harhar uses several open source libraries (JSON.NET, NodaTime and HarNet) and was provided for free (as in “free beer”). I have uploaded the Harhar source code on Github so it is now a free (as in “free speech”) and open … Continue reading

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Setting up Avalanche Automation on Linux


The Avalanche product comes with a fully-featured TCL API for several operating systems: Windows, Linux and FreeBSD. Coupled with the “GUI to TCL” feature of the Windows thick client (Avalanche Commander) it’s a very powerful automation tool. The typical use … Continue reading

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Introducing Harhar


Sometimes, you need to reproduce a typical HTTP user behavior under load. A typical example is the need to test a proxy with specific rules for specific pages – you need to ensure that applying a given rule won’t kill … Continue reading

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Avalanche 4.44 released


A couple of weeks ago, version 4.44 of Avalanche was released. It’s not a major (4.x) release, but some new features made it (on top of bug fixes). Here they are: TCP Selective ACK (SACK) is now a fully supported … Continue reading

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Testing Server Name Indication (SNI) In The Lab


People have been saying that Internet will run out of IPv4 address space for a long time now, and somehow hosting companies always managed to cope. One of the “coping mechanisms” consists of regrouping several websites behind one IP address … Continue reading

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Avalanche Now Supports ETag and If-None-Match


With the release of version 4.37 this week, Avalanche now supports the ETag and If-None-Match concept. This will be highly useful for Content Delivery Network (CDN) testing as well as caching devices implementing this concept. Let’s start with a little … Continue reading

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Spirent Launches Avalanche NEXT


TL;DR: Go here. A Brief History of  Time Avalanche When you look back at the history of Avalanche, you realize it was the first ever web testing stateful test tool – that could scale, anyway. It really picked up because it … Continue reading

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