How to combine mac and web based authentication

[pull]

Hi,

I've already searched for it on the net and in this forum but there was no
real information.

I would need a 2 step authentication. First the mac-based authentication
(with a switch that supports mac based auth) and secondly the web-based
authentication. But I don't know how to combine these two within the radius
configuration :-/.
Since it's a closed LAN the clients who were successfully authenticated with
their mac address have normal access to the LAN. When for example some
guests come (they come rather often) they'll fail the authentication and get
into an "guest lan". There they should authenticate themselves a second time
against the radius server with a username/password login (web page for
example) so they only can access the internet.
That would be the problem - to make this second authentication
  
Help is greatly appreciated!

pull
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