The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 10, 1998
Filed:
Jun. 04, 1996
Mark Savoldi, Lincoln, CA (US);
Alan R Albrecht, Granite Bay, CA (US);
Lisa S Brown, Granite Bay, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
Network access to a port is secured by monitoring the source address of packets that are sent as a device tries to train to the port over the network. If the source address matches an authorized source address assigned to the port to which the device is attached, then the device is allowed access to the system. If the device tries to train with a source address different from the authorized address, then the device is not allowed to train into the network, and all packets sent by the device are denoted as errored packets to prevent them from being accepted by any other device in the network. The system also detects when a device tries to disguise itself by first training with an authorized source address and then sends a packet with an unauthorized source address. If a packet is received which contains a source address other than the one that the device is authorized to use, the packet is marked as invalid so that it is not accepted by any other device in the network. The unauthorized device is then required to re-establish its connection to the network by retraining to guarantee that it is the authorized device.