Filtering is being done by eg 217.218.154.250. This hop is after my source's ISP. The filtering IPs are owned by ITC, Iran's central telco. It's http://bgp.he.net/AS12880 (h/t to Tor team for that).Filtering targets all google.com IPs, some but not all torproject.org IPs, probably more. Haven't attempted a broad scan. It's a simple connection drop; filtered connections just time out.
It is not based on SSL handshake signature; testing SSL on nonstandard ports worked successfully, and testing non-SSL on :443 of target IPs was blocked.
via plus.google.com
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