Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2005-08-02
2005-08-02
Pham, Chi (Department: 2663)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S250000
Reexamination Certificate
active
06925079
ABSTRACT:
An IP address duplication detection method using an address resolution protocol is used in a network system in which an IP address duplication diagnosis/detection host and a plurality of check target hosts are connected to a single LAN, all the hosts are respectively assigned MAC addresses as hardware addresses unique to devices without any duplication, and an address resolution protocol aimed at acquiring a MAC address of a remote device from an IP address is installed in each host. In this method, an ARP request packet containing a check target IP address in the same subnet as for the IP address duplication diagnosis/detection host is sent out from the IP address duplication diagnosis/detection host to each of the check target hosts through the LAN. IP address duplication is detected depending on whether an ARP reply packet as a response packet for the ARP request packet is returned from each of the check target hosts to the IP address duplication diagnosis/detection host through the LAN.
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“What is an IP address?”. Duke. Published on Internet at www.duke.edu/˜yy7/ee156/ip_addr.pdf. Sep. 27, 1999. pp. 1-18.
Ferris Derrick W
NEC Corporation
Pham Chi
Whitham Curtis & Christofferson, PC
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