In article <mailman.1886.1277331842.21153.bind-us...@lists.isc.org>,
 Mark Andrews <ma...@isc.org> wrote:

>       If it is not a local DPI problem then the only other thing
>       is that domaincontrol.com in using anycast and one or more
>       of the sites is using using nameservers that don't respond
>       to EDNS queries or has a firewall that blocks EDNS queries.

A few minutes poking around with traceroute.org finds the same two 
destinations that Mark does, one apparently in Washington DC or close by 
accessed via AboveNet, GBLX, Level3 and maybe others, and the other in 
or around Singapore, accessed via SingTel.

Sam
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