For those who are not familiar with DPI: http://en.wikipedia.org/wiki/Deep_packet_inspection http://en.wikipedia.org/wiki/Deep_packet_inspection As an example,

For those who are not familiar with DPI: http://en.wikipedia.org/wiki/Deep_packet_inspection http://en.wikipedia.org/wiki/Deep_packet_inspection As an example, HTTP uses the "Host:" header which contains the domain name of the website in question. Deep packet inspection could work by recognizing HTTP communication, inspecting the "Host:" header and simply dropping traffic to censored websites.