Method and apparatus for supporting duplicate suppression when issuing multicast queries using DNS-format message packets
US9998321B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2002 |
| Grant date | Jun 12, 2018 |
| Priority date | — |
| Expiry date | Feb 13, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L61/4511
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Domain Name System (DNS) Queries and DNS Responses both use the same packet format. The DNS packet format includes a header section, a question section, an answer section, an authority record section and an additional record section. In conventional DNS Queries, the header section and the question section are used; the answer section, authority record section and additional record section are empty. In the present invention, when issuing a query, the client places the question in the question section as usual, and places all the answers it already knows into the (previously empty) answer section. When receiving a query, a responder checks to make sure that the answer it is about to give is not already included in the answer section. If the answer is listed in the answer section of the query, it means that the client already has that information, and doesn't need to be told again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.