Patents by Inventor Joshua V. Graessley

Joshua V. Graessley 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).

  • METHOD AND APPARATUS FOR DETECTING A ROUTER THAT IMPROPERLY RESPONDS TO ARP REQUESTS
    Publication number: 20080298257
    Abstract: One embodiment of the present invention provides a system that detects a non-compliant router that incorrectly responds to all address-resolution-protocol (ARP) requests, including ARP requests and ARP probes for link-local IP addresses. This is accomplished by sending an ARP request asking for an Ethernet address associated with a link-local IP address, wherein the link-local IP address is a reserved link-local IP address, which should not be assigned to any device. If a response is received to the ARP request, the system determines that the response was sent by a non-compliant router that incorrectly responds to all ARP requests, including ARP requests for link-local IP addresses.
    Type: Application
    Filed: August 13, 2008
    Publication date: December 4, 2008
    Applicant: APPLE INC.
    Inventors: Stuart D. Cheshire, Joshua V. Graessley
  • Method and apparatus for detecting a router that improperly responds to ARP requests
    Patent number: 7436783
    Abstract: One embodiment of the present invention provides a system that detects a non-compliant router that incorrectly responds to all address-resolution-protocol (ARP) requests, including ARP requests for link-local IP addresses. This is accomplished by sending an ARP request asking for an Ethernet address associated with a link-local IP address, wherein the link-local IP address is a reserved link-local IP address, which should not be assigned to any device. If a response is received to the ARP request, the system determines that the response was sent by a non-compliant router that incorrectly responds to all ARP requests, including ARP requests for link-local IP addresses.
    Type: Grant
    Filed: April 4, 2005
    Date of Patent: October 14, 2008
    Assignee: Apple Inc.
    Inventors: Stuart D. Cheshire, Joshua V. Graessley