[Dnsmasq-discuss] DHCP option for Captive Portals

[Donald Chisholm]

Thanks Alex.  I was able to confirm that both my Android and Windows
machine on a new dhcp lease the machine makes a request for a particular
url and if that is redirected presents the captive portal message.

I'm going to take a closer look at the dhcp messages to confirm when this
is happening.

Thanks again
On May 27, 2014 8:06 AM, "Alex Xu" <alex_y_xu at yahoo.ca> wrote:

> 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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