What objective does Anycast DNS serve?
A communication or routing technique called Anycast DNS makes it possible to send and receive data more quickly. Using this technique, a single IP address can be typed into several DNS servers worldwide. Any of them is capable of responding to the request. The intended outcome is for the server to react physically closest to the user. This greatly accelerates the response time (DNS resolution).
What advantages come with using Anycast DNS?
- Simple to configure: Most Мanaged DNS providers make setting up an Anycast DNS simple.
- DNS inquiries are answered quickly. There are many more DNS nameservers evenly scattered across critical areas. This will provide a quicker response to each request, regardless of its source. More is always better.
- Load balancing. The nearest Anycast DNS server replies to the traffic. Numerous servers respond to the queries of neighboring customers. A weak network spot is prevented by avoiding using the same nameservers for all traffic. An Anycast DNS network’s load balancing ability enables it to withstand even DDoS attacks because the attacks are dispersed over the network.
- Scalability. You may raise or decrease the number of Anycast DNS servers if you use a cloud-based DNS service. Simply switch from one plan to the next. With a small initial investment and a recurring monthly fee, you can have a robust network of servers.
- Redundancy. You have a network of nameservers rather than just one, and since they all point to the same IP address, if one goes down, the recursive DNS server will keep looking for another Anycast DNS server that can answer DNS requests. The client won’t notice the delay when the server starts up again and can carry on as usual.
How does it perform?
Anycast DNS works by using the same DNS records for multiple locations and IP addresses. A device that is connected to the Internet communicates with a server by using its IPv4 or IPv6 address. The most basic kind of communication is one-on-one interaction. It’s alright, and there’s a possibility that DNS resolution will function. However, if only one server has the required information, individual requests will have to travel quite far to reach it (A or AAAA record). The user won’t receive the desired response if the server is down. There won’t be a response to the query.
Unicast DNS vs. Anycast DNS
Unlike other DNS systems, Unicast DNS works differently. In contrast to the topic of our article today, DNS server data is maintained on-site at the DNS server’s physical location. This means that any devices that want to show your site will consult this server, independent of the user’s location. The response latency will therefore rise if your server is in Asia and the user is in Germany. The website would also be unavailable if your DNS server crashed or compromised unless you had a backup strategy. In contrast, if you use Anycast DNS, this won’t occur because you’ll be directed to the next closest server if the first one is unavailable.
Anycast DNS, in general, is a method of keeping traffic local. You route it to the nearest instance, providing your clients with a quick and dependable service. Furthermore, it is simple to install and will improve your networking.