Patent ID: 7926100
Filing Date: 2011-04-12
Classification: H04L,H04W,Y02D

Abstract:
1. A method for preventing unauthorized connection in a network system performed in a first network device, said method of preventing unauthorized connection comprising: receiving a LLDP packet compliant with an 802.1ab communication protocol transmitted from an external second network device; analyzing said LLDP packet and checking to see if said LLDP packet containing a legitimate authentication key; and if said authentication key being absent or illegitimate, then blocking all packets transmitted from said second network device; and, if said legitimate authentication key being found, then allowing all packets transmitted from said second network device to pass; wherein said LLDP packet comprises the following fields: a TLV title and a TLV data stream; said TLV data stream includes a MAC address of said second network device and said authentication key is contained in said TLV data stream.