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I remember that Apple's AirPort base stations used to have a DHCP "Welcome Message" feature, that would display a custom pop-up dialog when computers connected to the network. How was this accomplished?

I'm trying to duplicate this feature on a Mikrotik router (for a guest network), which means I need to know the DHCP option code that was used for this. Unfortunately, I can't find any documentation on this.

I'm sure it's some kind of standard, since it works on both Mac+Windows without any extra software, but I can't find any references to it outside of Apple's old support pages -- which don't go into technical detail about how it actually worked.

Also, Apple's newer AirPort base stations don't have this feature anymore, otherwise I could just grab a packet capture. :)

(The closest I could find was Option 56 [DHCP Message], but that seems to be something else entirely.)

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  • Research the term Captive Portal. – joeqwerty Jun 20 '15 at 22:38
  • Some router does not use that dhcp option. It detect you want to go on the wan, and forward the request to the welcome page. – yagmoth555 Jun 20 '15 at 22:56
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    @joeqwerty: This wasn't a captive portal. It was an OS-generated modal dialog that appeared before even opening up a web browser. (And I'm not talking about automatic captive portal mini-browser dialogs that some OSes display now, either; this predated all of that.) – Trevor Johns Jun 21 '15 at 23:51
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I am going to guess zero conf protocol and some local Mac service that will do the graphical part on the host.

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