MIT Technology Review: A Deeper Look at Iranian Filtering

Thursday, August 06, 2009

A researcher finds telltale signs that the Iranian government has become more efficient at filtering.
Looking into Iran's portion of the Internet is not an easy task.
But the network security firm Arbor Networks recently released traffic data for both internal and external-facing Internet service providers in the country. This data shows that the country continues to filter Internet traffic and that its ISPs can filter larger quantities of data than before.
Arbor Networks uses data gathered from distributed network sensors to monitor the data going to Iran from the global Internet.
In a post on Sunday, the firm showed that the overall trend for the first three weeks of July was an increasing amount of traffic headed into Iran. The country has a single national provider that handles Internet traffic, but a handful of internal providers. The picture painted by the data is of an ISP that is becoming increasingly skilled in filtering, says Craig Labovitz, chief scientist for Arbor Networks.
"It was speculated early on that they lacked capacity," Labovitz says. "It wasn't that traffic was being filtered, it was that it was being dropped because they lacked capacity. Now, it looks like they are navigating 5 gig of traffic again, and I don't think they have turned off filtering."

For more see: http://www.technologyreview.com/blog/unsafebits/23946/