From: "Bruno LAURET" <bruno dot lauret at semita dot fr>

> I use monowall for a captive portal for a wireless  network and I want to 
> know
> how to authorize the consultation of a site (just one) before the 
> authentification.

In other systems, this is referred to as "Walled Garden."  On M0n0wall, it 
is set by ip address only (Not domain name) under "Services: Captive portal: 
Allowed IP addresses."  This is handy if you want your authentication page 
to pull graphics from another website.