[Noisebridge-discuss] bypassing captive portals

Jonathan Lassoff jof at thejof.com
Sat Nov 9 18:56:38 UTC 2013


The variety of captive portals with different interfaces and pricing
will make this hard to do if you just want IP/Internet connectivity.

If it's just a little bit of data (10's - 100's of bits), I would look
into DNS, as most will still forward requests out to the Internet,
albeit rate-limited.
It's getting tough tunneling full IP stacks over DNS these days, but
if you did a little custom DNS server that just receives an encoded
question/request, that should be enough to get a little bit of
telemetry through.

Cheers,
jof

On Sat, Nov 9, 2013 at 9:53 AM, Dana <dana-lists at sonic.net> wrote:
> Hey Noisebridge,
>
> I have mobile sensor device that will occasionally need to send/receive a
> small amount of data. The application is non-commercial/research, not hugely
> time-sensitive, hardware has wifi support & runs embedded linux --- I am
> considering making use of opportunistic wifi connections.
>
> Free, open wifi is abundant but many hotspots (e.g. public library, union
> square, starbucks) have a 'check box and agree to ToS' captive portal.
> Before I try to write something, does anyone know of a pre-existing script
> or project that can detect, handle or auto-submit these captive portals? I
> suppose DNS tunneling could be an another option...
>
> Thanks!
>
> ~ Dana
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