Usage: radiusniff [-vVrqa] [-i interface] [-f expression] [-d dictionary ] [-c clients] [-s passwd] for me on the localhost interface, the sniff give me : # radiusniff -v -ilo0 ERROR: 7.20.0.64:56 > 7.20.0.64:49364 - non RADIUS packet (bad length in packet: 60328) --