Category Archives: Recipes

Irish Radio Stations on Linux

Posted on October 21, 2010 by Barry O'Donovan

I’m a bit of a newstalk junky and like to have the radio on in the back ground. It’s quite painful jumping between websites and even more painful getting them all to work under Linux so I have some simple … Continue reading →

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Combatting SPAM in ISP Mail Servers

Posted on October 7, 2010 by opensolutions

Fighting SPAM is not easy. Here’s an example of how we configured an ISP mail server cluster to reduce the SPAM load… Continue reading →

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Testing SPAM and Virus Filters

Posted on October 4, 2010 by Barry O'Donovan

I’ve recently performed a complete upgrade of Open Solutions’ mail servers and I’ve now moved onto doing likewise for one of our ISP customers with a lot of users. These retrofits include installing virus and SPAM filters to protect both … Continue reading →

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Asterisk SIP Brute Force Attacks on the Rise

Posted on September 17, 2010 by Barry O'Donovan

See my article on the company blog for a discussion on this, and a how to on using Fail2ban to help stop these attacks.

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SIP Brute Force Attacks on the Increase

Posted on September 17, 2010 by opensolutions

On our own Asterisk PBX server for our office and on some customer boxes with open SIP ports, we have seen a dramatic rise in brute force SIP attacks. They all follow a very common pattern – just over 41,000 … Continue reading →

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