In our recent study, that involves vantage points in more than 50 commercial ISPs and content requests for around 10,000 hosts, we observed that the location of DNS resolvers break the assumption made by CDNs about the vicinity of the end-user and its DNS resolver. Moreover, we observed that third-party DNS resolvers do not manage to redirect the users towards content available within the ISP, contrary to the local DNS ones. We do believe that this problem is not limited to iTunes but may effect the end-user experience when downloading CDNized content that is already a significant fraction of Internet traffic.
You can find more about our comparison of DNS resolvers in the Wild here:
http://www.net.t-labs.tu-berlin.de/papers/AMSU-CDRW-10.pdf
You can find more about our study on the effect of third-party DNS resolvers in content delivery here:
http://www.net.t-labs.tu-berlin.de/papers/PFASF-ICDUPADI-10.pdf
To better understand DNS and its performance, we would like to scale up the experiments and for this we are seeking your help. If you are willing to participate in this effort, please go to the following link:
http://www.fg-inet.de/
Download the script that can be found in the download section of the website, and run it from an Internet connection provided by a commercial ISP, e.g., at home. The typical duration of the experiment is around six hours. All major operating systems are supported (Linux, Mac OS, Windows etc.). Once the experiment is done, please upload the traces on our website:
http://www.fg-inet.de/upload.php
Our script performs DNS queries for a number of predefined hosts. This list is included in plain text in the download packages. The traces collected with our program do not interact with any of your browsing or download history or activity. The additional bandwidth consumption and CPU load due to the experiment are negligible. The traces collected on this website will be kept confidential within the project and will not be distributed to any third party, nor shared with any third party. You also have the option to make them accessible to the research community if you wish so.
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In our recent study, that involves vantage points in more than 50 commercial ISPs and content requests for around 10,000 hosts, we observed that the location of DNS resolvers break the assumption made by CDNs about the vicinity of the end-user and its DNS resolver. Moreover, we observed that third-party DNS resolvers do not manage to redirect the users towards content available within the ISP, contrary to the local DNS ones. We do believe that this problem is not limited to iTunes but may effect the end-user experience when downloading CDNized content that is already a significant fraction of Internet traffic. You can find more about our comparison of DNS resolvers in the Wild here: http://www.net.t-labs.tu-berlin.de/papers/AMSU-CDRW-10.pdf You can find more about our study on the effect of third-party DNS resolvers in content delivery here: http://www.net.t-labs.tu-berlin.de/papers/PFASF-ICDUPADI-10.pdf To better understand DNS and its performance, we would like to scale up the experiments and for this we are seeking your help. If you are willing to participate in this effort, please go to the following link: http://www.fg-inet.de/ Download the script that can be found in the download section of the website, and run it from an Internet connection provided by a commercial ISP, e.g., at home. The typical duration of the experiment is around six hours. All major operating systems are supported (Linux, Mac OS, Windows etc.). Once the experiment is done, please upload the traces on our website: http://www.fg-inet.de/upload.php Our script performs DNS queries for a number of predefined hosts. This list is included in plain text in the download packages. The traces collected with our program do not interact with any of your browsing or download history or activity. The additional bandwidth consumption and CPU load due to the experiment are negligible. The traces collected on this website will be kept confidential within the project and will not be distributed to any third party, nor shared with any third party. You also have the option to make them accessible to the research community if you wish so.