06512774 is referenced by 80 patents.

A method and system for detecting a non-functioning network interface card (NIC) in a server computer system adapted to have a plurality of network interface cards coupled thereto and communicatively coupled to client computer systems in a network. A directed packet is sent from a first NIC to a second NIC, and a direct packet is also sent from the second NIC to the first NIC. The server computer system monitors the NICs to determine whether the directed packet from the first NIC is received by the second NIC. The server computer system also monitors the first NIC to determine whether the directed packet from the second NIC is received by the first NIC. The server computer system determines whether the first NIC is functioning using the results from the monitoring. When the first NIC is determined to be non-functioning, the functions of the first NIC are automatically switched from the first NIC to one of the plurality of NICs. A broadcast packet is sent from the server computer system to the client computer systems. The broadcast packet contains a media access control (MAC) address for the NIC that replaces the first NIC, and each client computer system replaces the MAC address for the first NIC with the MAC address for the second NIC in its memory cache.

Title
Fail over with multiple network interface cards
Application Number
9/272085
Publication Number
6512774 (B1)
Application Date
March 18, 1999
Publication Date
January 28, 2003
Inventor
Thomas A Maufer
Santa Clara
CA, US
Sameer Nanda
Sunnyvale
CA, US
Roman G Baker
San Jose
CA, US
RamKrishna Vepa
Danville
CA, US
Agent
Wagner Murabito & Hao
US
Assignee
3Com Corporation
CA, US
IPC
G06F 13/00
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