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Re: Gmail and China's GFW
From: bk <chort0 () gmail com>
Date: Mon, 21 Mar 2011 13:39:52 -0700


On Mar 21, 2011, at 10:52 AM, Alien Chatter wrote:

$ sudo iptables -I INPUT -m string --algo bm --hex-string
'|476f6f676c6520496e63311830160603550403140f6d61696c2e676f6f676c652e636f6d30819f30|'
-j DROP

Try it, you will get a connection timeout:

$ curl --connect-timeout 60 https://mail.google.com/
curl: (28) SSL connection timeout

The same applies for Twitter, Facebook... Much more efficient than
DNS/IP blocking!


Because searching for a bytestring in payload generates so much less load than just overriding a DNS result at the 
recursive server (that users are forced to issue queries to) or a simply drop SYNs based on IP header value that 
routers/firewalls are optimized for...

I think you forgot your coffee this morning.  It's not just for aliens you know.

--
chort

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