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Method and apparatus for supporting duplicate suppression when issuing multicast queries using DNS-format message packets

  • US 9,998,321 B2
  • Filed: 03/19/2002
  • Issued: 06/12/2018
  • Est. Priority Date: 03/19/2002
  • Status: Active Grant
First Claim
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1. A computer-executable method to obtain information that is represented using domain name system (DNS) resource records, at a requesting entity in a domain, comprising:

  • multicasting a DNS request query asking for information identified by a DNS name, a query type and a query class as defined in IETF RFC 1035 from a computer system, wherein the query includes;

    a questions section containing the DNS name, the query type and the query class,wherein the query type indicates that the information contained in the query is of one of the following types;

    a host address,a canonical name of an alias,a CPU and OS used by a host,a mail exchange for the domain,an authoritative name server for the domain,a pointer to another part of the domain name space, ora start of the zone authority, andwherein the query class indicates a network protocol family or an instance of a network protocol,a non-empty answer section containing at least one answer to the request query known by the requesting entity, wherein the list of known answers includes known addresses which correspond to the DNS name in the question section of the request query;

    receiving at the computer system responses to the multicasted request query that contain additional answers that are not in the list of known answers, wherein the list of known answers is in the request query, and wherein a responding entity suppresses responses to queries that contain answers that are included in the list of known answers in the query; and

    adding the additional answers to the list of known answers;

    wherein sending the list of known answers along with the request query suppresses the known answers in the received responses.

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