Patent ID: 9300623
Filing Date: 2016-03-29
CPC Classification: H04L

Claim Text:
1. A method of facilitating a domain name system (DNS) cache integrity check system, comprising: checking each of a plurality of domain name to internet protocol (IP) address mappings of a plurality of DNS cache servers via a checking application of a checking server; consulting a valid list data store, wherein the valid list data store comprises a plurality of authorized domain name to IP address mappings; in response to consulting the valid list, identifying a discrepant domain name to IP address mapping by the checking server, wherein the discrepant domain name to IP address mapping is a domain name to IP address mapping stored in a DNS cache server that is not located on the valid list; in response to identifying a discrepant domain name to IP address mapping, requesting a domain name to IP address mapping for at least one of the DNS cache servers from an authoritative DNS server by the checking application; and writing the authorized domain name to IP address mapping received from the authoritative DNS server to the valid list.