Patents by Inventor Yu Kwong Ng
Yu Kwong Ng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8904513Abstract: The method can be implemented on a processor executing software instructions stored in memory. In one embodiment of the invention, the method includes receiving an Ethernet frame, wherein the Ethernet frame comprises a Transmission Control Protocol (TCP) header, wherein the TCP header comprises a TCP header length value. When the Ethernet frame is received, the TCP header length value is compared to a predetermined value.Type: GrantFiled: April 4, 2003Date of Patent: December 2, 2014Assignee: Cisco Technology, Inc.Inventors: Kenneth M. Rose, Venkateshwar R. Pullela, David S. Walker, Kevin C. Wong, Kaichuan He, Yu Kwong Ng
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Patent number: 8296452Abstract: Disclosed is a method and apparatus for checking link layer protocol frames such as Ethernet frames. The method can be implemented on a processor executing software instructions stored in memory. In one embodiment of the invention, the method includes receiving an Ethernet frame, and counting data bytes of the Ethernet frame to generate a total number of counted bytes. The total number of counted bytes can be used to calculate a data length of a datagram of the Ethernet frame. Once calculated, the datagram data length can be compared to a predetermined value. If the datagram length does not fall within an acceptable range of the predetermined value, the Ethernet frame may be dropped so that the Ethernet frame does not reach its final destination.Type: GrantFiled: March 6, 2003Date of Patent: October 23, 2012Assignee: Cisco Technology, Inc.Inventors: Kenneth M. Rose, Venkateshwar R. Pullela, David S. Walker, Kevin C. Wong, Kaichuan He, Yu Kwong Ng
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Patent number: 7623468Abstract: The present invention provides a packet processing device and method. A parsing processor provides instruction-driven content inspection of network packets at 10-Gbps and above with a parsing engine that executes parsing instructions. A flow state unit maintains statefulness of packet flows to allow content inspection across several related network packets. A state-graph unit traces state-graph nodes to keyword indications and/or parsing instructions. The parsing instructions can be derived from a high-level application to emulate user-friendly parsing logic. The parsing processor sends parsed packets to a network processor unit for further processing.Type: GrantFiled: August 25, 2004Date of Patent: November 24, 2009Assignee: Cisco Technology, Inc.Inventors: Rina Panigrahy, Jackie Liu, Daniel Yu-Kwong Ng, Sanjay Jain, Nagaraj A. Bagepalli, Abhijit Patra
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Patent number: 7586851Abstract: The present invention provides a packet processing device and method. A parsing processor provides instruction-driven content inspection of network packets at 10-Gbps and above with a parsing engine that executes parsing instructions. A flow state unit maintains statefulness of packet flows to allow content inspection across several related network packets. A state-graph unit traces state-graph nodes to keyword indications and/or parsing instructions. The parsing instructions can be derived from a high-level application to emulate user-friendly parsing logic. The parsing processor sends parsed packets to a network processor unit for further processing.Type: GrantFiled: April 26, 2004Date of Patent: September 8, 2009Assignee: Cisco Technology, Inc.Inventors: Rina Panigrahy, Jackie Liu, Daniel Yu-Kwong Ng, Sanjay Jain, Nagaraj A. Bagepalli, Abhijit Patra
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Patent number: 7409526Abstract: A method and apparatus wherein only a partial key is stored in a hashing table is disclosed. By storing a partial key as opposed to storing the entire original key, less data is required to be stored in the hash table. This reduces the attendant memory costs. The reduction in memory requirement does not degrade the hash functionalities whatsoever. Hashing conflicts can be fully resolved by consulting the partial key.Type: GrantFiled: October 28, 2003Date of Patent: August 5, 2008Assignee: Cisco Technology, Inc.Inventors: Daniel Yu-Kwong Ng, Yung-Chin Chen
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Patent number: 7359968Abstract: A method for sampling n-out-of-N packets in a network. Initially, the packet index corresponding to the N packets is pseudo-randomly shuffled. The shuffle function rearranges a set of numbers pseudo-randomly with a one-to-one mapping and no overlap. One way to perform the pseudo-random shuffle function is to use a linear feedback shift register (LFSR). The LFSR supports N being a power of two. However, the LFSR approach can be adapted to support N being any positive integer value. Based on the results of the shuffle function, sampling points are pseudo-randomly selected. By pseudo-randomly selecting the sample points, n-out-of-N sampling greatly minimizes biases.Type: GrantFiled: January 23, 2004Date of Patent: April 15, 2008Assignee: Cisco Technology, Inc.Inventors: Daniel Yu-Kwong Ng, Simon Wai-Ming Hsu
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Patent number: 6952402Abstract: A data exchange system includes at least one transmitting agent, at least one receiving agent, and a plurality of data links each having a crossbar coupling respective transmitting agents and receiving agents. A stream of data packets including at least one Order Critical Flow of data packets having a critical order to be sent from the transmitting agent to the receiving agent is divided for transmission among the plurality of data links. Multiple Order Critical Flows between the transmitting agent and the receiving agent are possible and the packets within such Order Critical Flows can be intermixed for transmission (along with packets from other Non-Order Critical Flows).Type: GrantFiled: August 28, 2001Date of Patent: October 4, 2005Assignee: Cisco Technology, Inc.Inventors: Daniel W. Crocker, Daniel Yu Kwong Ng
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Patent number: 6886118Abstract: The method can be implemented on a processor executing software instructions stored in memory. In one embodiment of the invention, the method includes receiving an Ethernet frame, wherein the Ethernet frame comprises an IP datagram, wherein the IP datagram comprises an IP header and an IP payload, wherein the IP payload comprises a User Datagram Protocol (UDP) header. When the Ethernet frame is received, a length in bytes of the IP payload of the IP datagram is calculated.Type: GrantFiled: April 4, 2003Date of Patent: April 26, 2005Assignee: Cisco Technology, Inc.Inventors: Kenneth M. Rose, Venkateshwar R. Pullela, David S. Walker, Kevin C. Wong, Kaichuan He, Yu Kwong Ng
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Publication number: 20040205228Abstract: Disclosed is a method and apparatus for checking link layer protocol frames such as Ethernet frames. The method can be implemented on a processor executing software instructions stored in memory. In one embodiment of the invention, the method includes receiving an Ethernet frame, and counting data bytes of the Ethernet frame to generate a total number of counted bytes. The total number of counted bytes can be used to calculate a data length of a datagram of the Ethernet frame. Once calculated, the datagram data length can be compared to a predetermined value. If the datagram length does not fall within an acceptable range of the predetermined value, the Ethernet frame may be dropped so that the Ethernet frame does not reach its final destination.Type: ApplicationFiled: March 6, 2003Publication date: October 14, 2004Inventors: Kenneth M. Rose, Venkateshwar R. Pullela, David S. Walker, Kevin C. Wong, Kaichuan He, Yu Kwong Ng
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Publication number: 20040177106Abstract: The method can be implemented on a processor executing software instructions stored in memory. In one embodiment of the invention, the method includes receiving an Ethernet frame, wherein the Ethernet frame comprises an IP datagram, wherein the IP datagram comprises an IP header and an IP payload, wherein the IP payload comprises a User Datagram Protocol (UDP) header. When the Ethernet frame is received, a length in bytes of the IP payload of the IP datagram is calculated.Type: ApplicationFiled: April 4, 2003Publication date: September 9, 2004Inventors: Kenneth M. Rose, Venkateshwar R. Pullela, David S. Walker, Kevin C. Wong, Kaichuan He, Yu Kwong Ng
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Publication number: 20040177275Abstract: The method can be implemented on a processor executing software instructions stored in memory. In one embodiment of the invention, the method includes receiving an Ethernet frame, wherein the Ethernet frame comprises a Transmission Control Protocol (TCP) header, wherein the TCP header comprises a TCP header length value. When the Ethernet frame is received, the TCP header length value is compared to a predetermined value.Type: ApplicationFiled: April 4, 2003Publication date: September 9, 2004Inventors: Kenneth M. Rose, Venkateshwar R. Pullela, David S. Walker, Kevin C. Wong, Kaichuan He, Yu Kwong Ng
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Patent number: 6609225Abstract: Methods and apparatus are disclosed for generating and checking CRC values using a multi-byte CRC generator on a variable number of bytes. These methods and apparatus could used in an unlimited number of applications and environments, such as part of computer or communications device (e.g., router or switch). A CRC generator is used to calculate a preliminary CRC value on a block of information. This CRC generator may be a balanced XOR tree or some other implementation, which calculates the preliminary CRC value on groups of n bytes of data at a time, where n is typically some value such as 2, 4, 8, 16, 32, 64 etc. For example, when data is transferred over a 512 wide bit bus, typically the value of n would be 64 (i.e., 512 bits divided by 8 bits per byte).Type: GrantFiled: December 21, 2000Date of Patent: August 19, 2003Assignee: Cisco Technology, Inc.Inventor: Yu Kwong Ng
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Patent number: 6351454Abstract: A data exchange system includes at least one transmitting agent, at least one receiving agent, and a plurality of data links each having a crossbar coupling respective transmitting agents and receiving agents. A stream of data packets including at least one Order Critical Flow of data packets having a critical order to be sent from the transmitting agent to the receiving agent is divided for transmission among the plurality of data links. Multiple Order Critical Flows between the transmitting agent and the receiving agent are possible and the packets within such Order Critical Flows can be intermixed for transmission (along with packets from other Non-Order Critical Flows).Type: GrantFiled: July 24, 1998Date of Patent: February 26, 2002Assignee: Cisco Technology, Inc.Inventors: Daniel W. Crocker, Daniel Yu Kwong Ng
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Patent number: 5751952Abstract: An apparatus for interfacing a plurality of nodes to a network includes a plurality of working ports coupled to the nodes, an attachment port coupled to the network, an address table for storing addresses associated with the working ports, an incoming packet controller, and an outgoing packet controller. The incoming packet controller receives an incoming information packet from the network via the attachment port, and determines whether a destination address contained in the incoming packet matches one of the addresses stored in the address table. If a destination address match is found, then it is concluded that the incoming packet is intended for one of the working ports. Consequently, the incoming packet is sent to the working ports. If no destination address match is found, the incoming packet controller prevents the packet from being sent to the working ports, thereby eliminating unnecessary signal traffic to the ports.Type: GrantFiled: November 22, 1996Date of Patent: May 12, 1998Assignee: Allied Telesyn Int'l Corp.Inventors: Wei William Dai, Yu Kwong Ng