The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 09, 2025
Filed:
Jan. 31, 2024
Level 3 Communications, Llc, Broomfield, CO (US);
Dan Luther, Claremore, OK (US);
Dean Ballew, Sterling, VA (US);
John R. B. Woodworth, Amissvile, VA (US);
Carol Dawn Lovell, West Monroe, LA (US);
James C. Anders, Lee's Summit, MO (US);
Lisa Lamanna, Harrisonburg, VA (US);
Level 3 Communications, LLC, Denver, CO (US);
Abstract
Novel tools and techniques are provided for implementing improvement to domain name system ('DNS') security. In various embodiments, a computing system may receive a user datagram protocol (“UDP”)-based DNS request, and may send a UDP-based response message, which may include an empty payload portion and a header portion containing a truncate flag that is set, which indicates to resend the request as a transmission control protocol (“TCP”)-based DNS request. When the TCP-based DNS request is received within a first period, the computing system may send, to the source address, a TCP-based response message comprising an answer to a query (in the TCP-based DNS request) for a destination DNS record associated with a destination device. If no TCP-based DNS request is received from the source address within the first period, the computing system may block all UDP-based DNS requests from the source address for at least a second period.