xDSL with dynamic addressing

[Santiago Balaguer García]

Hi,
 
  I am using freeradius since four years and I used PPTP/L2TP tunnel for autenticating users against my RADIUS servers with one of my NAS has a dynamic IP (xDSL). However, I can not rely on these connections and the connectivity sometimes fall down and the tunnel, too. 
 
  I have some reasons for not to use dyndns or this kind of services.
 
  I decided to autenticate my NAS using only the shared key:
 
client 0.0.0.0/0 {
    secret = same_secret_for_eveyone
    shortname = my_network
}
 
  I recognize a problem with DoS attack to my DB.
 
  I can not autenticate the client IP because I have xDSL with dynamic IP. Do you know some other solucion instead of autenticating the public IP in the authorize step?
 
  Thanks,
 
                 Santiago
 
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