Round-Robin DNS is a simple method of load balancing. It allows you to distribute incoming website traffic across multiple servers so that no single server becomes overwhelmed.
Think of it like a revolving door at a busy building: as people (users) arrive, the door rotates to send each person to a different desk (server) in a specific order.
How it Works
In a standard setup, one domain name points to one IP address. In a Round-Robin setup, one domain name points to a list of multiple IP addresses.
When users try to visit your site, the DNS server rotates through the list:
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User 1: Sent to IP Address A
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User 2: Sent to IP Address B
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User 3: Sent to IP Address C
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User 4: Sent back to IP Address A
Why is it Important?
The main goal of Round-Robin DNS is stability. By spreading the "weight" of your visitors across several servers, your website is much more likely to stay online during a massive traffic spike.
Key Considerations
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A Records Only: Round-Robin works with A records or AAAA records. It cannot be used with CNAME records, as having multiple CNAMEs for one host can break services like your email.
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Equal Distribution: The standard version of this system sends an equal amount of traffic to every server, regardless of how powerful that server is.
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Caching: Sometimes, a user's computer or internet provider will "remember" (cache) one specific IP address. This means that even if the rotation moves on, that specific user might keep hitting the same server for a while.
NOTE: Standard Nixzoehost BasicDNS and Shared Hosting DNS do not support manual Round-Robin configurations. This feature is typically reserved for advanced users on VPS or Dedicated Server environments where multiple server nodes are active.
The Drawbacks
While easy to set up, Round-Robin DNS has a few "blind spots":
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Server Health: If one of your four servers goes offline, the Round-Robin system might still try to send users there until you manually remove that IP from the list.
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Capacity: It doesn't know if Server A is a "supercomputer" and Server B is a "laptop"it sends them both the same amount of work.
Summary
Round-Robin DNS is an excellent, cost-effective way to start balancing your web load. If your business is growing and you are moving toward a multi-server setup, this is often the first step in ensuring your site stays fast and reliable for every visitor.
If you are planning a high-traffic launch and need a more advanced load-balancing solution, please contact the Nixzoehost Technical Team for a custom consultation.
