From Jordan Robertson, the AP:  Egypt has apparently done what many technologists thought was unthinkable for any country with a major Internet economy: It unplugged itself entirely from the Internet to try and silence dissent. …

In 2009, Iran disrupted Internet service to try to curb protests over disputed elections. And two years before that, Burma’s Internet was crippled when military leaders apparently took the drastic step of physically disconnecting primary communications links in major cities, a tactic that was foiled by activists armed with cell phones and satellite links.

Computer experts say what sets Egypt’s action apart is that the entire country was disconnected in an apparently coordinated effort, and that all manner of devices are affected, from mobile phones to laptops. It seems, though, that satellite phones would not be affected. …

Renesys’ network sensors showed that Egypt’s four primary Internet providers — Link Egypt, Vodafone/Raya, Telecom Egypt, Etisalat Misr — and all went dark at 12:34 a.m. Those companies shuttle all Internet traffic into and out of Egypt, though many people get their service through additional local providers with different names.

Italy-based Seabone said no Internet traffic was going into or out of Egypt after 12:30 a.m. local time. …

Craig Labovitz, chief scientist for Arbor Networks, a Chelmsford, Mass., security company, said that in countries such as Egypt — with a centralized government and a relatively small number of fiber-optic cables and other ways for the Internet to get piped in — the companies that own the technologies are typically under strict licenses from the government.

"It’s probably a phone call that goes out to half a dozen folks who enter a line on a router configuration file and hit return," Labovitz said.  …

The ease with which Egypt cut itself also means the country can control where the outages are targeted, experts said. So its military facilities, for example, can stay online while the Internet vanishes for everybody else.

Experts said it was too early to tell which, if any, facilities still have connections in Egypt. 

From Sarah Lovenheim, the Washington Post:  Only a network used by the stock exchange and banks was allowed to stay live.  (photo: Getty)

Image: getty%201%2028%2011%20Egypt%20cuts%20off%20internet.jpg