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Performance is a Journey not a Destination!
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    In the World of DNS, Cache is King Posted on July 15th, 2014 by Yu Ng

    The first time I learned how DNS gets resolved, I was quite surprised by how long and complicated the process was. Think about how many websites you visit in a given day, then consider how many of those you go to multiple times. Now imagine that every time you did, the ISP’s DNS server at the […]

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    Dissecting DNS Communications Posted on July 9th, 2014 by Yu Ng

    In our previous articles on DNS we gave an overview of the recursion process, but before we can go further on how DNS impacts performance, we need to understand how it the DNS protocol works. In the TCP/IP Protocol suite, DNS is an application layer protocol. DNS protocol relies on User Datagram Protocol (UDP) by […]

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    DNS Lookup: How a Domain Name is Translated to an IP Address Posted on July 1st, 2014 by Yu Ng

    At Catchpoint, we believe that fast DNS (Domain Name System) is just as important as fast content. DNS is what translates your familiar domain name (www.google.com) into an IP address your browser can use (173.194.33.174). This system is fundamental to the performance of your webpage, yet most people don’t fully understand how it works. Therefore, […]

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    The Domino Effect of LinkedIn’s DNS Outage Posted on June 21st, 2013 by Mehdi Daoudi

    On Wednesday night users trying to access LinkedIn site were redirected to servers owned by Confluence Labs.  The outage lasted a couple of hours and a post mortem Thursday described the issue as caused by human error at Network Solutions, provider for LinkedIn’s DNS. Immediate effect of the outage is obvious: upset LinkedIn users, ad […]

  • NBC is your DNS Ready for the Olympics? Updated 7/6/2012 Posted on June 4th, 2012 by Mehdi Daoudi

    I have always been a big fan of the Olympics, as I was growing up it was a huge family event, another occasion to get together, eat, shout, and laugh. In the US, to keep up with the medals you have to rely on NBC, as they are the official broadcaster for TV and Web. […]

  • DNS records and TTL – how long does a second actually last? Posted on April 4th, 2012 by Mehdi Daoudi

    This is a guest post courtesy of Frank Denis. The post originally appeared on Frank’s personal blog on November 17th, 2011. In a DNS zone, every record carries its own time-to-live, so that it can be cached, yet still changed if necessary. This information is originally served by authoritative servers for the related zone. The TTL […]

  • 3rd Party Providers and DNS Poisoning Risks – Updated Posted on February 21st, 2012 by Mehdi Daoudi

      Third party providers bring a lot of benefits to a website including lower operational cost (CDNs), revenue generation (Ads), and better insights (Analytics). Just like any component of a system, they also bring risks, which both providers and sites try to manage by various means. The most talked risk is the performance impact they […]

  • When DNS Sneezes, Web Speed Catches a Cold Posted on January 10th, 2012 by Catchpoint Systems

    For our frequent readers, it is no surprise that we firmly believe DNS has a huge impact on Performance. One of the biggest challenges with DNS is understanding what impact various DNS issues can have on end users. DNS resolution is complex and we lack insight on how end users’ DNS resolvers are configured to […]

  • Free DNS Can Hurt Web Performance Posted on October 5th, 2011 by Catchpoint Systems

    After working with one of our clients earlier in August, I tweeted the following: “I am just amazed how many companies use their registrars DNS as primary DNS … not GOOD! ” In reply to the tweet I received several questions, and it became clear that registrar-provided-DNS needed a discussion all of its own. (I […]

  • Fast Web Performance Starts with DNS… Posted on November 16th, 2010 by Catchpoint Systems

    You wake up, make coffee, sit down by the computer and start reading your favorite web sites. You fire up your favorite browser and type www.site.com on the address bar, hit enter and continue sipping on that coffee. You wait for the page to load, sipping some more coffee – a few seconds later you […]

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