What Is Round Robin DNS? How to Point One Domain to Two Servers

If you want one domain to work with more than one server, Round Robin DNS is one of the simplest methods to do it. Many website owners look for a way to host the same domain on two servers for load distribution or basic failover. Round Robin DNS makes this possible by returning more than one IP address for the same domain name.

This guide explains what Round Robin DNS is, how it works, how to set it up, and the important limitations you should understand before using it.

What Is Round Robin DNS?

Round Robin DNS is a DNS method that allows a single domain name to point to multiple IP addresses. Instead of returning only one server IP, the DNS server replies with a list of IPs. Each time a DNS request is made, the order of those IP addresses can change. As a result, different visitors may connect to different servers.

In simple terms:

• One domain
• Multiple server IPs
• DNS rotates the responses

This is commonly used for basic load distribution across web servers or other services.

Why People Use Round Robin DNS

Website owners and system administrators often use Round Robin DNS when they want to:

• Share traffic between two or more servers
• Reduce load on a single server
• Add a basic level of redundancy
• Point one domain to multiple hosts without complex load balancer hardware

It is popular because it is simple to configure at the DNS level.

How Round Robin DNS Works

When a visitor opens your website, their device asks DNS for the IP address of your domain.

With Round Robin DNS:

• The DNS server stores multiple A records for the same domain
• Each record points to a different server IP
• DNS returns the list of IPs in rotating order
• The visitor’s system usually connects to the first IP in the list

Over time, traffic is distributed among the available servers.

Example Setup

Suppose your domain is yourdomain.com and you have two servers:

Server 1 IP: 10.10.10.10
Server 2 IP: 10.10.10.11

In DNS, you create two A records:

Host	Type	Value
yourdomain.com	A	10.10.10.10
yourdomain.com	A	10.10.10.11

Now the domain can resolve to either server, depending on the DNS response order.

How to Set Up Round Robin DNS

Step 1: Prepare both servers
Make sure the website or service is available on both servers and configured correctly for the same domain.

Step 2: Open your DNS management panel
This may be your domain registrar, DNS provider, or hosting DNS zone editor.

Step 3: Add multiple A records
Add one A record for each server IP using the same hostname.

Example:

@ → 10.10.10.10
@ → 10.10.10.11

Step 4: Save and wait for DNS propagation
DNS changes may take some time to fully update depending on TTL values and resolver caches.

Round Robin DNS for Load Distribution

Round Robin DNS is often used as a basic load distribution method.

Because different clients receive different first IP addresses, connections are spread across servers. This can help when:

• Traffic is increasing
• One server alone is not enough
• You want a simple multi-server setup

However, it is not as advanced as a dedicated load balancer.

Important Limitations of Round Robin DNS

Although the setup looks simple, Round Robin DNS has several limitations:

1. DNS caching issues
ISPs and local devices cache DNS responses. That means a user may keep connecting to the same server for some time, even if another server is available.

2. No true health checks
If one server goes offline, DNS may still return its IP address until records are updated. Visitors can still be sent to the failed server.

3. Uneven traffic distribution
Because of caching and client behavior, traffic is not always shared equally between servers.

4. Not ideal for real-time failover
Round Robin DNS is not a complete high-availability solution by itself. For automatic failover, you usually need health monitoring and more advanced DNS or load balancing tools.

Round Robin DNS vs DNS Failover

These two terms are related but not the same.

Feature	Round Robin DNS	DNS Failover
Multiple IPs	Yes	Yes
Traffic sharing	Yes	Limited / secondary
Server health checks	Usually no	Yes
Automatic removal of down server	No	Yes
Best use	Basic load distribution	Availability and failover

If your main goal is reliability when a server fails, DNS failover or a proper load balancer is usually better.

Common Questions Related to Round Robin DNS

1. Can Round Robin DNS use CNAME records?
   Round Robin is typically configured with multiple A records. Using CNAMEs for this purpose is generally not recommended for the root domain.
2. Does it work on Linux and Windows DNS servers?
   Yes. Round Robin behavior can be configured in common DNS systems, including BIND on Linux and Microsoft DNS services.
3. Can it be used with cPanel?
   Yes. If you manage DNS in cPanel or WHM, you can add multiple A records for the same domain, provided your DNS setup allows it.
4. Is Round Robin DNS enough for high-traffic websites?
   It can help with basic distribution, but larger websites usually need dedicated load balancing, monitoring, and failover systems.

When You Should Use Round Robin DNS

Round Robin DNS is useful when:

• You want a simple way to point one domain to multiple servers
• You need basic traffic distribution
• You understand the limits of DNS caching and failover

It may not be enough when:

• You need automatic failover
• You require precise load balancing
• Session persistence or advanced traffic control is important

Conclusion

Round Robin DNS is a simple method for pointing one domain to two or more servers by using multiple A records. It can help distribute traffic and support basic multi-server setups.

However, because of DNS caching and the lack of built-in health checks, it should not be treated as a complete high-availability solution on its own.
If you only need a straightforward way to share traffic across servers, Round Robin DNS can work well. If uptime and automatic failover are critical, consider combining it with monitoring tools, failover DNS, or a proper load balancer.

Learn more: How to Clear the Local DNS Cache in a Linux Server