Two thirds of the world lost access to Youtube yesterday because Pakistan’s internet censors lost control of their censorship tools and applied them globally.
Pakistan is one of the many countries that censors websites by
publishing bad “routes” to them, using national firewalls to advertise
bogus pathways that computers should use to reach the banned sites; when
computers try to take these routes, they reach a dead end, and thus
their users can’t gain access to banned sites.
The protocol for publishing internet routing information is designed to
propagate from one computer to the next – this is part of how the
internet recovers from damage or malfunctions in backbone infrastructure
– and so careless censors can accidentally push poisoned routing
information beyond their national borders.
Pakistan’s censors ordered 70 ISPs to block Youtube over a trailer for
an upcoming movie by the Dutch authoritarian islamophobe Geert Wilders.
One or more ISPs messed up its routing table, and, according to Renesys
Corp, who monitors internet routing data, more than two thirds of the
world lost access to Youtube as a result.
China’s national censors have previously cut off worlwide access to
sites that were banned in China, and while they blamed this on operator
error, many in the global network infrastructure community believed that
it was a veiled threat or demonstration of power by China.
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