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Darren Rayes writes to mention a ZDNet article on Cambridge academics' claims that they have breached the great firewall of China. They also claim that by misusing the firewall they can launch DDoS attacks against IP addresses behind the wall. From the article:
"The IDS uses a stateless server, which examines each data packet both going in and out of the firewall individually, unrelated to any previous request. By forging the source address of a packet containing a 'sensitive' keyword, people could trigger the firewall to block access between source and destination addresses for up to an hour at a time."