[Dnsmasq-discuss] DHCP option for Captive Portals

Alex Xu alex_y_xu at yahoo.ca
Tue May 27 11:03:17 UTC 2014


On 26/05/14 08:23 PM, Donald Chisholm wrote:
> Recently I have noticed that on connect some wifi hotspots provide a popup
> message indicating that the user must login to obtain Internet access.
>  Since the user has not yet opened a browser I figure this feature is
> implemented via a DHCP option.  I found references to the
> proposed Captive-Portal identification in DHCP draft-wkumari-dhc-capport-00
> (http://tools.ietf.org/html/draft-wkumari-dhc-capport-00) which seems to be
> what I am looking for but it does not mention a proposed option number.
> 
> Anyone here know what the option is called or can point me in the direction
> of how this may be implemented.

this has nothing to do with dhcp. basically what Windows does is it
tries to GET a file on msft servers, and if it gets redirected or
otherwise receives the wrong page, it assumes there is a portal.

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