title: How to configure a freeradius server to require NAS-IP-Address attribute?
body: <p>I want to configure a freeradius server in the way that an authentication is successful only if NAS-IP-Address attribute is not empty and equals to some specific IP (of course a user name and a password match). </p>
  
  <p>How should I do it? I have tried to read the documentation without success:
  <a href="http://freeradius.org/rfc/attributes.html" rel="nofollow">http://freeradius.org/rfc/attributes.html</a>
  <a href="http://freeradius.org/rfc/rfc2865.html#NAS-IP-Address" rel="nofollow">http://freeradius.org/rfc/rfc2865.html#NAS-IP-Address</a></p>