Config question: substitute another attribute for username

[Adam Moffett]

I have a wireless system that can talk to RADIUS to control access for 
the wireless stations.  The AP is a NAS and the stations can be 
programmed with a username and password.  The idea is you reply with 
VSA's that set up QoS policies for the clients.  This is all working 
fine and dandy.

What I'd like to do is actually ignore the username and password they're 
sedning and instead match a vendor specific attribute called 
DAN-CPE-MAC-ADDRESS.

Alternately, they all come with a default username set in them. Will 
there be any harm if I make multiple users with the same name?

"cpe1" DAN-CPE-MAC-ADDRESS := "0a:0b:0c:0d:0e:0f"

"cpe1" DAN-CPE-MAC-ADDRESS := "01:02:03:04:05:06"

etc etc.