Via New York Times:
North Korea’s already tenuous links to the Internet went completely dark on Monday after days of instability, in what Internet monitors described as one of the worst North Korean network failures in years.
The loss of service came just days after President Obama pledged that the United States would launch a “proportional response” to the recent attacks on Sony Pictures, which government officials have linked to North Korea. While an attack on North Korea’s networks was suspected, there was no definitive evidence of it.
Doug Madory, the director of Internet analysis at Dyn Research, an Internet performance management company, said that North Korean Internet access first became unstable late Friday. The situation worsened over the weekend, and by Monday, North Korea’s Internet was completely offline.
“Their networks are under duress,” Mr. Madory said. “This is consistent with a DDoS attack on their routers,” he said, referring to a distributed denial of service attack, in which attackers flood a network with traffic until it collapses under the load.
North Korea does very little commercial or government business over the Internet. The country officially has 1,024 Internet protocol addresses, though the actual number may be somewhat higher. By comparison, the United States has billions of addresses.
The attack on North Korea’s ability to access the internet is directed at the elites, the hackers known as the GOP and Dear Leader Kim Jung-Un, because the vast majority of North Koreans have no access to the internet.
The AP reports the White House declined to comment on North Korea’s internet outage. A State Department spokeswoman said that of the federal government responses, “some will be seen, some may not be seen.”