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[liberationtech] Iran blocks MP3, MP4, AVI and SWF files

Collin Anderson collin at
Sat Oct 6 12:41:46 PDT 2012

What is particularly different in this case is that this filtering does not
return a 403 Code or TCP RST -- when a GET request for a .mp3 file is sent,
the connection is simply blocked. The server can send whatever it likes,
but the client will not see anymore traffic after that. This is abnormal,
but it does not seem to be a DPI rule (zero'ed out .mp3: blocked, .mp3
renamed to .rawr: successful transmission). I pointed out a few days ago on
Twitter that there will probably be new Internet interference in the wake
of the rapid currency depreciation, this seems to align with that theory
and the increased jamming of international broadcasting. It won't last but
it is definitely a way to poke at the infrastructure.

On Sat, Oct 6, 2012 at 2:30 PM, Amin Sabeti <aminsabeti at> wrote:

> Iran's Filtering Committee is continuing to find innovative ways of
> broadening the reach of online censorship in the Islamic Republic. This
> week they implemented a protocol that prevents audiovisual material hosted
> on external servers from entering Iran. Small Media reports.
> --
> Unsubscribe, change to digest, or change password at:

*Collin David Anderson* | @cda | Washington, D.C.
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