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A comment on Alarming number of DNS requests made by iOS devices. Parent comment

Re:Alarming number of DNS requests made by iOS devices by im3w1l on Sunday October 22, 2017 @12:08AM (#15525113)
Device: Am I on a captive portal? Nonce.

Apple server: No. Same Nonce. Cryptographic signature.

If different response: Captive portal. If no response: No internet.

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Re:Alarming number of DNS requests made by iOS devices by im3w1l on Sunday October 22, 2017 @10:29PM (#15530262)
Oops, this doesn't actually work, because the captive portal can just let that one request through unmodified...
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