partly OT: notification of url when connecting to open wifi

[Erez D]

Jonathan, if we are talking about walled garden/captive portal
implementation under linux, i'll take the opportunity to ask something
related.

how does the AP redirect every web access to the login page (for "non
accepted" clients)
i guess using a transparent proxy with a redirection page, am i correct ?
if i am correct, i would like to know:
1. does the AP allow real DNS access, or does it return the IP of the
AP for every dns query. (and if so what about DNS cache ?)
2. what "webserver/proxy" is used to return the same redirect answer
to every requested url


On Mon, May 26, 2014 at 10:44 AM, Jonathan Ben Avraham <yba at tkos.co.il> wrote:
> Hi Erez,
> For each AP you need to maintain a table of client connections that are
> "accepted", meaning that the client has presented some type of credential or
> payment or whatever.
>
> Packets from clients that are not accepted are routed to some authentication
> or payment gateway, with possible port translation.
>
> The accepted client table does not have to be on the AP itself. It is
> usually held in a RADIUS server upstream. The authentication gateway also
> does not need to be on the AP itself. It can be upstream and does not have
> to be the same as the RADIUS server. You can also have more than one payment
> gateway but use the same RADIUS server.
>
> That, in a nutshell is how it is done. There's a lot of netfilter/iptables
> smoke an mirrors going on on the AP.
>
>
>  - yba
>
>
> On Mon, 26 May 2014, Erez D wrote:
>
>> Date: Mon, 26 May 2014 10:26:52 +0300
>> From: Erez D <erez0001 at gmail.com>
>> To: Jonathan Ben Avraham <yba at tkos.co.il>
>> Cc: linux-il <linux-il at cs.huji.ac.il>
>> Subject: Re: partly OT: notification of url when connecting to open wifi
>>
>>
>> On Mon, May 26, 2014 at 10:23 AM, Jonathan Ben Avraham <yba at tkos.co.il>
>> wrote:
>>>
>>> Hi Erez,
>>> No. The ability to configure a payment/authentication gateway is a router
>>> feature. I worked on this feature for Alvarion's WBSn. Every router
>>> designer
>>> develops their own feature.
>>
>>
>> can you elaborate ?
>>>
>>>
>>>  - yba
>>>
>>>
>>> On Mon, 26 May 2014, Erez D wrote:
>>>
>>>> Date: Mon, 26 May 2014 10:11:54 +0300
>>>> From: Erez D <erez0001 at gmail.com>
>>>> To: linux-il <linux-il at cs.huji.ac.il>
>>>> Subject: partly OT: notification of url when connecting to open wifi
>>>>
>>>>
>>>> this is partially off topic
>>>>
>>>> some times when i connect to open wifi on aitports, my phone (android)
>>>> gives me a notification of a site i need to go to, and if i click on
>>>> it, it opens a browser with a predefined URL
>>>>
>>>>
>>>> i was wandering - is that part of an RFC or standard ?
>>>>
>>>>
>>>> 10x
>>>> erez.
>>>>
>>>> _______________________________________________
>>>> Linux-il mailing list
>>>> Linux-il at cs.huji.ac.il
>>>> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
>>>>
>>>
>>> --
>>>  9590 8E58 D30D 1660 C349  673D B205 4FC4 B8F5 B7F9  ~. .~  Tk Open
>>> Systems
>>> =}-------- Jonathan Ben-Avraham ("yba")
>>> ----------ooO--U--Ooo------------{=
>>> mailto:yba at tkos.co.il tel:+972.52.486.3386 http://tkos.co.il
>>> skype:benavrhm
>>
>>
>
> --
>  9590 8E58 D30D 1660 C349  673D B205 4FC4 B8F5 B7F9  ~. .~  Tk Open Systems
> =}-------- Jonathan Ben-Avraham ("yba") ----------ooO--U--Ooo------------{=
> mailto:yba at tkos.co.il tel:+972.52.486.3386 http://tkos.co.il skype:benavrhm