Re: Home page redirection, done at default router or use dummy DNS

From: Philippe WEILL (Philippe.Weill_at_aero.jussieu.fr)
Date: 01/26/05 

Date: Wed, 26 Jan 2005 16:02:27 +0100

itsharkopath@yahoo.com wrote:
> Hi,
> Imagine a user in a hotspot, when he comes to the hotspot and tries
> to load a webpage (on the internet), he would automatically redirected
> to login page.
> I believe the following is to be done.
> There should be a DHCP server setup which gives the arriving clients
> IP, default router address etc.
>
> Where should the homepage redirection be done,
> 1. It could be done at the default router, the clients who haven't
> authenticated would be given IP from a fixed address pool, and if the
> IP packets are from that address pool the default router sends the
> packet to the login webserver with a change in the destination IP
> address (to the login server). Now this involves configuring the
> router, does the standard routers allow this kinda configuration
> without significant hacking of the system. Here after successfully
> logging in the user is given a different DHCP config info.
>
> 2. In DHCP configuration information, a system in their domain is
> claimed as DNS, so when the user tries to load a page the DNS server
> gives the IP of the login webserver as IP of all the webservers any
> user is trying to access. Are there any problems in this. Ofcourse, the
> client side stores that IP for all the pages the user tries to login,
> however, the user would not try to load another page once (or utmost
> twice) the page is redirected to login page. So, this doesn't seem to
> be a problem at all. What should be used here as DNS, should a specific
> application be written for this purpose or is there any widely used
> software component that provides this functionality.
> Here after the user successfully authenticates, she is provided with
> new DHCP settings (DNS, IP address etc)
>
> Is there any other way to do this redirection
> -shar.
>

Yes port forwarding with iptables like transparent proxy 

-- 
  Weill Philippe -  Administrateur Systeme et Reseaux
  CNRS Service Aeronomie - Universite Pierre et Marie Curie -
  Tour 45/46 3e Etage B302 - 4 Place Jussieu - 75252 Paris Cedex 05 -  FRANCE
  Email:philippe.weill@aero.jussieu.fr | tel:+33 0144274759 Fax:+33 0144273776

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