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I thought the way these Wifi hotspots worked was that they intercepted all DNS traffic? How else would they work with legacy systems? Modern OSes detect these
by jakobegger 9y ago
I thought the way these Wifi hotspots worked was that they intercepted all DNS traffic? How else would they work with legacy systems?
Modern OSes detect these login pages by making a DNS lookup of a known domain, eg. macOS/iOS lookup "captive.apple.com", and if the answer is not in the 17.0.0.0/8 subnet they know someone is intercepting DNS and show the Wifi login window.
- keeperofdakeys 9y agoA lot of captive portals use HTTP interception/redirection, returning a 30X status instead of the expected 204 status.