Photograph posted to Twitter by Engin Onder on March 20, 2014, with the caption: "#twitter blocked in #turkey tonight. folks are painting #google dns numbers onto the posters of the governing party." The poster shows the AKP candidate for Eskişehir.
Last Friday, DNS-themed graffiti and memes began to appear in Turkish streets and on the web, bringing the normally unnoticed architecture of the internet into public discourse.
The sudden focus on DNS, the system that translates a URL into its corresponding numerical IP address, was prompted by Prime Minister Recep Tayyip Erdogan's decision on March 20 to ban Twitter. Court orders were issued to Turkish internet service providers, who apparently implemented DNS redirects, meaning that requests for "twitter.com" would be routed to a different IP address and shown a warning page.
This kind of block is not particularly effective; users can easily circumvent it by using a public DNS server. Instead of sending the request for twitter.com to a Turkish ISP, users could simply change their computer's network settings and send the request to Google or OpenDNS, or any number of international, publicly available DNS servers. While this is easy to do, it's perhaps not widely understood, and so fans of internet freedom took to the web and the streets to spread the word about the DNS workaround.