Round-Robin DNS – Everything you need to know

What is Round-Robin DNS?

Round-Robin DNS is a mechanism for administrating the incoming traffic. 

This technique is based on the time of arrival of the user request and the actual number of servers that you have. Simply you create several A or AAAA records with different IP addresses (IPv4 and IPv6) that correspond to the multiple servers. Each one of them stores a duplicate of the information for your website. So, whenever a user requests your domain name, the authoritative name server, storing the A or AAAA records, is going to provide the next in rotation turn A or AAAA records from those you created. The users are going to be automatically directed when they are desire to reach your website. The exact moment when they reach your DNS name server is important for the precise order.

Let’s break down the process a little bit more. 

In a case you have 5 users and 3 servers:

User 1 connects to server 1.

User 2 connects to server 2.

User 3 connects to server 3.

At the moment when user 4 requests to visit your website, the circle will start again. 

User 4 will connect to server 1

User 5 will connect to server 2 and so on.

Why should you use it?

Round-Robin DNS handles the traffic to your website and reduces it. As an outcome, the user experience of your customers is going to be drastically improved. In addition, the network is going to be less saturated, and its performance is going to be better.

This load balancing mechanism allows modifications. That means in case your servers are not equal and one of them is better than the rest, you can set the mechanism in the best productive way. The weaker servers are going to receive less traffic.

Round‑Robin DNS algorithm types

  • Weighted Round-Robin – You can choose specific criteria and assign the particular weight to every server. Typically, administrators use the server’s traffic‑handling capability. The higher the weight, the bigger the number of user requests the server is going to receive. 
  • Dynamic Round-Robin – A weight is assigned dynamically to each server. It observes real‑time data about the servers’ load and unused potential.

Benefits of Round-Robin DNS

  • It is very simple and easy to install and set up the Round-Robin DNS.
  • Balancing the traffic improves the security and could prevent a DDoS attack in progress.
  • Round-Robin DNS is a pretty cost-effective option.
  • It satisfies the users’ expectations and handles high volumes of traffic efficiently.
  • You can easily optimize the functionality of your network to make it healthy, fast, and safe.

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