Author Archives: acastaner

About acastaner

I'm the EMEA Technical Lead for Application & Security at Spirent. I specialize in layer 4-7 technologies, Cloud, Programming and CyberSecurity.

IPSEC Remote Access Testing using Avalanche and Fortigate – The Sequel


A few years ago I wrote an article on how to test IPSEC on a Fortigate using Avalanche. But the article is largely outdated and only covers Preshared Key Authentication. It so happens that I recently needed to configure a … Continue reading

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restic is probably the best backup solution for nerds


Backup (and Backup Management) is a Big Deal and should not be taken lightly. There are many paid-for solution of various qualities. There are also various backup strategies. I won’t cover those but I’ll just say that you should have both … Continue reading

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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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