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 From:  Lee Sharp <leesharp at hal dash pc dot org>
 To:  "m0n0wall at lists dot m0n0 dot ch" <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] Captive Portal
 Date:  Thu, 17 Sep 2009 17:42:45 -0500
You have several issues here, all mixed togeather.  Let me break them out...

Bad IP Address on Vista.

This is a known issue for lots of people...
"Windows Vista cannot obtain an IP address from certain routers or from
certain non-Microsoft DHCP servers"

Passthru MAC does not work.

You MUST first do web traffic before it opens.  Not e-mail.  Not DNS 
lookup.  Not VPN.  Not p2p...  It is kind of a pre-approval, but you 
still must log in without actually seeing the login.  Allowed IPs bypass 
this totally.

Captive portal does not work.

This can be MAC address rewrites by cheap APs or it can be some type of 
Link Checker not allowing you to go to the login page until it verifies 
that it is not spam, which it can not do until you log in...

Each issue is worthy of it's own thread, and has spawned several.