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If you're being randomly redirected to sites like ours, www.norwich.edu, opensourcematters.org, www.paramiko.org, but also thousands of other sites[1], it means you are a victim of the [http://en.wikipedia.org/wiki/Great_Firewall Great Firewall of China] (GWF).
Starting in January 2015, the Great Firewall was slightly modified and began to use DNS spoofing on a mass scale - for any "censored" DNS names like www.youtube.com or www.facebook.com, GWF sends fake DNS replies aimed at seemingly random IP addresses outside of China[2]. This results in massive disruptions for internet users in China and massive overload of random webservers outside of China. Some Hong Kong users are also reportedly affected.