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[liberationtech] Important Iranian Filternet Changes

Nadim Kobeissi nadim at
Sun May 5 06:59:17 PDT 2013

I just wanted to say thank you to Collin for this very informative and
interesting stuff. There's a lot more being posted on his Twitter feed for
those who care.


On Sun, May 5, 2013 at 7:37 AM, Griffin Boyce <griffinboyce at>wrote:

> Do you think it's practical for circumvention tools to mimic traffic
> sources known to the Iranian filternet?
> ~Griffin
> On Sun, May 5, 2013 at 6:57 AM, Collin Anderson <collin at
> > wrote:
>> Readers of Libtech may be interested in the changes to the filtering
>> regime that were imposed a few hours ago. Currently traffic streams, at
>> least unknown streams if not all, are being dropped after exactly sixty
>> seconds, terminating the connection. It appears this is based on protocol
>> rather than port, implying DPI, and thus likely to disrupt nearly every
>> anti-filtering tool, including those that leverage obfsproxy.
>> tcpdump screenshot, need to clean pcap:
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