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Re:Apparently AT&T has started blocking 4chan by Xichekolas on Sunday July 26, 2009 @10:50PM (#725260)
Latest theory seems to be that AT&T is doing this because there is constant on-going DDoS of img.4chan.org via AT&T's network. If this is true, then AT&T is presumably implementing a temporary block to help 4chan.org avoid this DDoS (and save itself from the flood of DDoS traffic).

(Citing the ongoing discussion in /x/ here: http://zip.4chan.org/x/res/2338751.html#2339847 and this thread on DSLReports: http://www.dslreports.com/forum/r22770292-)

Re:Apparently AT&T has started blocking 4chan by omail on Sunday July 26, 2009 @11:24PM (#725308)
The full DSLReports thread is at http://www.dslreports.com/forum/remark,22769947 . In a later post apeface, an AT&T employee, wrote:

"Well, I didn't see 207.126.64.182 or 207.126.64.181 in any block lists in the uverse routers , but that isn't to say they aren't blocked on the backbone someplace. We obviously aren't blocking the entire site or any particular link due to content because I can still access everything else but the links using the IP's above. If we where going to block a site, it wouldn't normally just be bits and parts, it would be all of it."

EDIT: apeface confirms AT&T has img.4chan.org blocked at the backbone.

Re:Apparently AT&T has started blocking 4chan by Xichekolas on Monday July 27, 2009 @10:39AM (#725903)
Lending more credence to this line of thought: http://www.merit.edu/mail.archives/nanog/msg19609.html
Re:Apparently AT&T has started blocking 4chan by Confusion on Monday July 27, 2009 @01:29AM (#725424)
Fortunately most people aren't jumping to any conclusions [/sarcasm].