I have some servers on Rackspace cloud platform. Having full control over OS allows to make many useful testing, even if its virtualized  Recently while doing some server hardening work I discovered not an obviously thing with iptables. In fact some of my firewall rules where completely ignored!!

I am not the iptables newbie and was very surprised by such behavior. Find the story below…

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CDN is abbreviation for Content Delivery Network. Hard to believe that like 5 years ago it sounded like a rocket science in WWW. Only huge sites were able to afford it and configure it right. Now things have completely changed and today’s question is: Why you still do not use CDN for your site or blog?

Because of the W3 Total Cache plugin, setting up a CDN for WordPress based site is criminally simple. Thats another one cent in my love WordPress topic. If your website receives more than a few hundred visitors a month, or if your site makes visitors download a lot of data (images, self-hosted javascripts, flash files, etc.), this is a great setup.

There’s also an SEO benefit in using a CDN…at least indirectly. Faster sites get more traffic from Google and Bing than slower sites. By making your site faster, you increase the likelihood Google will refer people to your site.
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