title: Limit connections per user using FreeRADIUS
body: <p>I'm here because after a good time searching how to limit the simultaneous connections of a user with FreeRADIUS I haven't achieved it...</p>
  <p>My intention is that each user connects only once and that when they try to access again with that account, if it is already in use, it does not allow them to connect to the network, but I do not find how to do it??</p>