how to force Captive Portal to check user subnet before authentication?

From:	"Marcelo Bezerra" <ocachorro at gmail dot com>
To:	m0n0wall dash dev at lists dot m0n0 dot ch
Cc:	m0n0wall at lists dot m0n0 dot ch
Subject:	how to force Captive Portal to check user subnet before authentication?
Date:	Wed, 27 Sep 2006 14:44:46 -0300

Hi folks!
I´m running Captive Portal and I need a quite simple feature (not in
my point of view =P ).

How can I make CP authentication check user IP/subnet?

Like this:
user "dog" has an IP address from 192.168.1.0/24 subnet. That´s the
only subnet he is allowed to authenticate from. If user "dog" tried to
authenticate in CP from other subnet than 192.168.1.0/24 then CP
rejects the connection.

Is it possible?

Thnx in advance.


p.s.: sorry my awful english =/