US 9,426,116 B1 · Multiple-master DNS system

Abstract

One or more embodiments provide a system and method for DNS that is resistant to losses of network connections. In some particular embodiments, DNS servers are operated to maintain consistency of DNS records between the multiple master servers in response to connection failure. Each master DNS server monitors network connectivity by periodically testing network connections of the master server (e.g., to other master servers) to determine whether the master DNS is isolated in a manner that prevents updates from being distributed between the master DNS servers. In response to detecting network isolation of the master DNS server, the master DNS server is configured to enter the isolation mode, in which the master DNS monitors the status of connections and takes appropriate actions to update and/or recover DNS data when connections are restored.

Claims14

Dependent claims

An apparatus comprising:

a domain name system (DNS) server configured and arranged for use in a Voice-over-Internet Protocol (VoIP) call routing system that provides dynamic DNS call routing information for setup of a VoIP call, the DNS server including
at least one processor circuit that is configured to operate as a first DNS master server by:
maintaining consistency of DNS records with at least one second DNS master server by updating DNS data records using communications over a network and between the first and second DNS master servers;
detecting network isolation by monitoring connections to the network;
entering an isolation mode in response to detecting the network isolation;
preventing, in response to the isolation mode, updates to the DNS records;
detecting restoration of connections to the second DNS master server;
exiting, in response to detecting restoration, the isolation mode;
and
updating, in response to exiting of the isolation mode, the DNS data records to establish consistency of the DNS records between the first and second DNS master servers.

7 more elements

Dependencies are inferred from the claim text.

Multiple-master DNS system

Life of this patent

Multiple-master DNS system

Life of this patent

Abstract

Claims14