(also Domain Name System redundancy)
DNS redundancy definition
DNS redundancy refers to having multiple Domain Name System (DNS) servers in place to ensure continued functionality in the event of a single server failure or a distributed denial of service (DDoS) attack. Distributing DNS queries across multiple servers minimizes the risk of a single point of failure and improves the overall reliability and availability of the system.
See also: DNS server
DNS redundancy examples
- Primary and secondary DNS servers: A primary DNS server holds the original DNS records, while the secondary DNS server maintains a copy of these records. If the primary server fails, the secondary server can continue resolving domain names.
- Anycast DNS: Anycast is a networking technique that allows multiple servers with the same IP address to be distributed globally. When a DNS query is made, it is routed to the nearest server, improving response times and providing redundancy.
DNS redundancy benefits
- Improved reliability: By distributing DNS queries across multiple servers, the likelihood of a single point of failure is reduced.
- Enhanced performance: With Anycast DNS, users’ queries are directed to the nearest server, reducing latency and improving response times.
- Increased resilience against cyberattacks: DNS redundancy can help mitigate the impact of DDoS attacks by distributing the attack traffic across multiple servers.
DNS redundancy tips
- Utilize both primary and secondary DNS servers to maintain an updated copy of DNS records.
- Consider implementing Anycast DNS to improve performance and resiliency.
- Monitor your DNS infrastructure regularly to detect potential issues and respond to them swiftly.