On Tue, 2012-07-10 at 15:11 -0400, Stéphane Graber wrote: > There are other ways to detect such cases without having the machine > connect to an external service. > > Someone suggested on IRC to implement a doesnt-exist.ubuntu.com which is > essentially a record that Canonical would guarantee never to exist in > the ubuntu.com. zone. > > If you can resolve or even access that host, then you are behind some > kind of captive portal/proxy.
My standard DSL will resolve every address to Verizon's search engine to
"help me" figure out where I miss typed it. I think you need some sort
of positive identification unfortunately, negative won't work here.
--Ted
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