Using a test query to determine whether a network device suffers from a software bug or design flaw
CA 2603571 C · Owner: Apple Inc. · Inventors: Cheshire, Stuart D.; Graessley, Joshua V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
One embodiment of the present invention determines if a domain name system (DNS) server is flawed. During operation the system sends a special , exploratory query to the DNS server wherein the exploratory query is , constructed to detect the existence of a flaw in the DNS server. If the answer from the DNS server indicates that a flaw exists in the DNS server the system , takes remedial action. Another embodiment detects a non-compliant router that incorrectly responds to all address-resolution-protocol (ARP) requests including ARP requests for link-local IP addresses. This embodiment sends an ARP request asking for an Ethernet address associated with a reserved linklocal IP address, …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed April 4, 2006 and granted February 21, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 4, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.