Custom error messages

[Santiago Balaguer García]

 Hi, 
 
  I use freeradius 1.1.7 for autenticate users to provide Internet connectivity. I have groups of usernames who has access from anywhere. However, I have others groups which only has access from one NAS (promotional codes). I know how to block these accounts from my Postgres Database:
 
               table radgroupcheck
                    promotion     NAS-IP-Address  !~  1.2.3.(4|5)
 
I reject the request from the NAS wich IP 1.2.3.4 or 1.2.3.5.
 
My question is: Can I send the error message: You are not allow from this site? 
If it is so, how?
 
  Thanks,
                    Santiago
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