Level 3 Communications, LLC

Dan Luther

Michael E Feldpusch

Dean Ballew

John R B Woodworth

Mark Dehus

John Rb Woodworth

James C Anders

Carol Dawn Lovell

Lisa Lamanna

The present application describes systems and methods for populating a DNS cache of a recursive DNS server using information gathered by a threat intelligence system. The threat intelligence system may collect some or all DNS responses from one or more recursive DNS servers as the one or more DNS servers process various received requests. Since the threat intelligence engine has access to this DNS data, the DNS data may be used to seed a DNS cache of a recursive DNS server.

Using a threat intelligence framework to populate a recursive DNS server cache

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.

Domain name system (DNS) security

Systems and methods are provided for distributing a domain name service (DNS) response cache in a DNS resolving system on a network. The systems and methods described herein may improve response times for client queries and also protect the DNS resolving system from DNS related cyber attacks.

Federated DNS caching

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Claremore, OK, United States of America

Dan Luther