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Google DNS and OpenDNS vs CDNs

December 4th, 2009 Leave a comment Go to comments

With more and more people moving towards using a global DNS system (like Google DNS and OpenDNS) the speed advantages of a CDN may be cancelled out.

Most of the major CDNs use geotargeting based on where the DNS is being resolved from. For example Facebook’s CDN solution (using Akamai) resolves static.ak.fbcdn.net to 210.55.501.200, a 5ms response time. Using Google’s public DNS server (8.8.8.8) the same domain resolves to 72.246.43.42, 72.246.43.32, a 200ms response time.

So while using Google’s DNS/OpenDNS may save a few ms while resolving a domain, it may slow down a site by putting the CDN pops further away from end users. Until CDN’s can work with these public DNS providers the internet may become slower for those using these services.

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  1. Owen
    December 5th, 2009 at 16:54 | #1

    I thought that geotargeting was based on the correlation of netblocks with countries?

  2. December 5th, 2009 at 21:14 | #2

    I tried Google Public DNS and its fast
    My report shows almost 50% less latency but when I changed name server for one of domain
    it took time to reflect that changes on my local PC and as soon as I changed it to Open DNS
    I can see name server change

  3. April 25th, 2010 at 19:45 | #3

    I agree, until this is sorted you aren’t necessarily better going onto a CDN.

  4. Gerardo Lisboa
    June 15th, 2010 at 01:18 | #4

    Are the results from http://www.akamai.com/html/technology/products/personalization.html consistent with your problem?

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