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Data sharing method for recursive DNS servers

  • US 8,583,806 B2
  • Filed: 02/05/2013
  • Issued: 11/12/2013
  • Est. Priority Date: 02/06/2012
  • Status: Active Grant
First Claim
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1. A method for responding to a client DNS query comprising:

  • receiving a DNS query from a client at a first DNS server system;

    obtaining a DNS answer to the DNS query;

    storing the DNS answer in a first local cache of the first DNS server system;

    selecting a subset of DNS answers on the first local cache to be shared with a second DNS server system, wherein the subset includes at least the DNS answer to the DNS query, wherein the selecting is based on one or more of the following;

    a TTL value of the DNS answer, a popularity of the DNS query, an amount of time or processing resources used to process the DNS query;

    sharing the subset of DNS answers with the second DNS server system;

    storing the subset of DNS answers on a second local cache of the second DNS server system; and

    returning the DNS answer to the client.

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