US Patent No: 6,049,825

Number of patents in Portfolio can not be more than 2000

Method and system for switching between duplicated network interface adapters for host computer communications

Stats

ATTORNEY / AGENT: (SPONSORED)
 

Importance

Loading Importance Indicators... loading....

Abstract

A method and system for switching between duplicated network adapters in order to provide a host computer with fault-tolerant functionality for TCP/IP communication with a plurality of other hosts over a network. A first host is equipped with a first and second network adapters, which constructs a hot standby system. When a fault of the first network adapter has been detected, the first host disconnects the first network adapter and activates the second network adapter. The first host then initializes its own network table (or ARP cache) and initiates transmission of a control message addressed to the second host. This control message is an echo request message defined in the ICMP protocol. The second network adapter broadcasts an ARP request message to all hosts on the network. The second host replies to this ARP request message by returning an ARP response message. The second network adapter transmits the control message to the second host by using address information contained in the ARP response message. Upon receipt of a response message from the second host in reply to the control message, the first host recognizes it as the completion of the process of switching from the first network adapter to the second network adapter.

Loading the Abstract Image... loading....

First Claim

Related Publications

Loading Related Publications... loading....

Patent Owner(s)

Patent OwnerAddressTotal Patents
FUJITSU LIMITEDKAWASAKI21511

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Yamamoto, Shinji Kyoto, JP 318 2583

Cited Art

Patent Info (Count) # Cites Year
 
CITRIX SYSTEMS, INC. (1)
5,963,540 Router pooling in a network flowswitch 73 1997
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
5,774,640 Method and apparatus for providing a fault tolerant network interface controller 91 1991
 
HITACHI, LTD. (1)
5,983,360 Information processing system with communication system and hot stand-by change-over function therefor 23 1997
 
LUCENT TECHNOLOGIES INC. (1)
5,835,696 Data router backup feature 127 1995
 
NEC CORPORATION (1)
5,815,668 Slave inter-lan connection device, an inter-lan connection system and a hot standby method of said inter-lan connection system 47 1996

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (34)
6,370,147 Method for addressing of passive network hosts in a data-over-cable system 57 1998
6,636,485 Method and system for providing quality-of-service in a data-over-cable system 32 1998
6,775,276 Method and system for seamless address allocation in a data-over-cable system 23 1998
6,560,203 Method for changing type-of-service in a data-over-cable system 13 1998
6,510,162 System and method for managing channel usage in a data over cable system 178 1998
6,442,158 Method and system for quality-of-service based data forwarding in a data-over-cable system 86 1998
6,892,229 System and method for assigning dynamic host configuration protocol parameters in devices using resident network interfaces 6 1998
6,662,135 Method and apparatus for reflective mixer testing of a cable modem 19 1998
6,986,157 Method and system for dynamic service registration in a data-over-cable system 30 1998
6,657,991 Method and system for provisioning network addresses in a data-over-cable system 42 1998
6,577,642 Method and system for virtual network administration with a data-over cable system 135 1999
7,099,338 System and method for insuring dynamic host configuration protocol operation by a host connected to a data network 10 1999
6,697,862 System and method for network address maintenance using dynamic host configuration protocol messages in a data-over-cable system 21 1999
6,654,387 Method for network address table maintenance in a data-over-cable system using a network device registration procedure 18 1999
6,754,622 Method for network address table maintenance in a data-over-cable system using destination reachibility 20 1999
6,985,437 Method for dynamic performance optimization in a data-over-cable system 24 1999
6,785,292 Method for detecting radio frequency impairments in a data-over-cable system 19 1999
6,553,568 Methods and systems for service level agreement enforcement on a data-over cable system 127 1999
7,089,580 Method for improved cable modem ranging in a data-over-cable system 28 2000
6,804,262 Method and apparatus for channel determination through power measurements 15 2000
6,944,881 Method for using an initial maintenance opportunity for non-contention ranging 3 2000
6,816,500 Apparatus, method and system for multimedia access network channel management 45 2000
7,107,326 Method and system for integrating IP address reservations with policy provisioning 25 2000
7,068,597 System and method for automatic load balancing in a data-over-cable network 38 2000
6,948,184 System and method for calibrating power level during initial ranging of a network client device 4 2000
6,940,874 Method for reducing interference from initializing network devices in a data-over-cable system 14 2000
6,952,428 System and method for a specialized dynamic host configuration protocol proxy in a data-over-cable network 42 2001
7,073,055 System and method for providing distributed and dynamic network services for remote access server users 37 2001
7,222,255 System and method for network performance testing 26 2001
7,088,678 System and method for traffic shaping based on generalized congestion and flow control 68 2001
7,085,306 System and method for a multi-frequency upstream channel in a computer network 16 2001
7,072,337 System and method for resolving network addresses for network devices on distributed network subnets 31 2002
7,114,070 System and method for automatic digital certificate installation on a network device in a data-over-cable system 40 2002
7,639,624 Method and system for monitoring network connectivity 3 2004
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (9)
6,775,278 Method and apparatus for generating replies to address resolution protocol requests 10 2000
6,697,326 Method and apparatus for generating replies to address resolution protocol requests 4 2000
6,678,725 Method and apparatus for generating replies to address resolution protocol requests by offload adapters 2 2000
6,657,974 Method and apparatus for generating replies to address resolution protocol requests 15 2000
6,760,859 Fault tolerant local area network connectivity 30 2000
7,440,453 Determining availability of a destination for computer network communications 0 2004
7,281,118 Sending thread message generated using DCR command pointed message control block storing message and response memory address in multiprocessor 1 2005
7,743,129 Methods and arrangements to detect a failure in a communication network 1 2006
7,765,290 Methods and arrangements to detect a failure in a communication network 0 2008
 
FUJITSU LIMITED (3)
6,247,063 Network terminal equipment capable of accommodating plurality of communication control units 45 1998
6,865,687 Communication control device 9 2000
7,975,289 Program, client authentication requesting method, server authentication request processing method, client and server 0 2005
 
NEC CORPORATION (3)
6,891,840 LAN path control system capable of easily changing active port of terminal 3 2001
7,031,319 ATM switching system 0 2001
7,774,532 Processing device, failure recovery method therefor, and failure restoration method 0 2006
 
CISCO TECHNOLOGY, INC. (2)
7,246,168 Technique for improving the interaction between data link switch backup peer devices and ethernet switches 14 1998
7,945,656 Method for determining round trip times for devices with ICMP echo disable 1 2004
 
GOOGLE INC. (2)
6,601,195 Switch adapter testing 30 1999
7,305,461 Method and system for network management with backup status gathering 6 2000
 
NEC INFRONTIA CORPORATION (2)
6,810,010 Redundant LAN system, active line/stand-by line switching method, and recording medium 5 2000
6,711,614 Method for carrying out real time backup communication of IP communication 5 2000
 
RAYTHEON BBN TECHNOLOGIES CORP. (2)
7,028,099 Network communication between hosts 4 2000
6,996,084 Publishing node information 16 2000
 
SCHNEIDER AUTOMATION INC. (2)
7,032,029 Method and apparatus for an active standby control system on a network 9 2000
6,968,242 Method and apparatus for an active standby control system on a network 8 2000
 
AT&T INTELLECTUAL PROPERTY II, L.P. (1)
7,881,289 Method and apparatus for porting telephone numbers of endpoint devices 0 2004
 
CANON KABUSHIKI KAISHA (1)
7,546,358 Network device control apparatus, network device control method, network device control program, and computer-readable recording medium storing network device control program therein 2 2000
 
FACHHOCHSCHULE GIESSEN-FRIEDBERG (1)
8,086,210 Flow based layer 2 handover mechanism for mobile node with multi network interfaces 0 2008
 
HITACHI, LTD. (1)
7,107,481 Server takeover system and method 5 2002
 
INTEL CORPORATION (1)
6,418,124 Method and apparatus for routing a packet in a network 5 1997
 
MICRON TECHNOLOGY, INC. (1)
6,622,257 Computer network with swappable components 4 2000
 
REDUNDANT NETWORKS, INC. (1)
6,934,762 Method and apparatus for providing backup internet access 1 2000
 
SAMSUNG ELECTRONICS CO., LTD. (1)
7,561,898 Apparatus and method for registering wireless terminals with access point through wireless network 0 2004
 
SHNEIDER AUTOMATION INC. (1)
7,023,795 Method and apparatus for an active standby control system on a network 5 2000
 
STEELEYE TECHNOLOGY, INC. (1)
6,430,610 TCP/IP address protection mechanism in a clustered server environment 20 1998
 
SUN MICROSYSTEMS, INC. (1)
7,389,411 Secure transfer of host identities 1 2003
 
SWAN LABS, INC. (1)
7,567,573 Method for automatic traffic interception 0 2004
 
VERIZON CORPORATE SERVICES GROUP INC. (1)
8,144,595 Variable translucency no-sight routing for AD-HOC networks 1 2005