[Dnsmasq-discuss] DHCP option for Captive Portals

[Donald Chisholm]

Good idea.  If I think about it I'll trace this next time I'm in a
hotspot.
On May 27, 2014 2:54 AM, "Albert ARIBAUD" <albert.aribaud at free.fr> wrote:

> Hi Donald,
>
> Le Mon, 26 May 2014 21:23:27 -0300, Donald Chisholm
> <donald.chisholm at gmail.com> a écrit :
>
> > Hi all,
> >
> > 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.
>
> No idea about the option number (rather than 'name') since it still is
> TBA in the RFC, but if you know of a hotspot which does this, you can
> set up a machine with tcpdump or wireshark running, connect to the
> hotspot , and see for yourself.
>
> Implementing the option in dnsmasq should not prove difficult, as I
> guess it is just a matter of adding the right dhcp-option line in your
> dnsmasq configuration.
>
> > Thank you for reading,
> >
> > Doanld
>
> Amicalement,
> --
> Albert.
>
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