Resilient domain name service (DNS) resolution when an authoritative name server is unavailable
US11032127B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2017 |
| Grant date | Jun 8, 2021 |
| Priority date | — |
| Expiry date | Oct 6, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L61/45
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a resolution resiliency application performs robust domain name system (DNS) resolution. In operation, the resolution resiliency application determines that an authoritative name server that is responsible for a domain name specified in a DNS query is unavailable. In response to determining that the authoritative name server is unavailable, the resolution resiliency application performs operation(s) that modify one or more DNS records stored in a cache based on one or more resiliency policies associated with the authoritative name server. The resolution resiliency application then generates a DNS response to the DNS query based on a DNS record stored in the modified cache. Notably, unlike conventional techniques that may generate inaccurate DNS responses based on stale DNS records, the disclosed techniques increase the likelihood of providing clients with DNS responses that accurately provide requested information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.