Split DNS: What Is It and Why Does It Matter?
If you’ve never heard of Split DNS, don’t worry. It sounds more complicated than it really is.
First, What Is DNS?
DNS, or the Domain Name System, is essentially the system that helps turn a name into an address.
When you type a website address into your browser, DNS helps your computer work out where to go.
Split DNS takes that basic idea and allows your network to provide different answers depending on where the request is coming from.
How Does Split DNS Work?
For example, a business might have a service available at a particular domain name. Someone working inside the office doesn’t necessarily need to go out to the internet and then come back in again to reach that service.
With Split DNS, internal users can be directed to the internal address, while external users can still be directed to the public address.
In simple terms, the same name can point to different destinations depending on whether the person is inside or outside the network.
Why Use Split DNS?
When configured appropriately, Split DNS can provide several benefits:
- More efficient internal traffic
- Simpler network routing
- Better performance for internal services
- Fewer unnecessary trips through the internet
- A cleaner way of handling internal and external services
It’s particularly useful where a business has things such as servers, NAS devices, internal applications, remote-access systems, or other network services that need to be accessible using consistent names.
It’s Not Always Necessary
The important thing is that Split DNS isn’t something you add simply because it sounds like a good technical feature.
It needs to solve an actual networking problem and be configured correctly.
For a small or simple network, there may be no real benefit to introducing additional DNS complexity. For a business with multiple internal services, however, it can be a useful part of a well-designed network.
Good Network Design Is Often Invisible
This is one of those areas where good IT design is often invisible when it works properly.
The best network improvements aren’t necessarily the ones users notice. They’re the ones that make everything work more cleanly.
If you’re dealing with an increasingly complicated network, internal services that don’t behave as expected, or problems accessing services from inside your own network, RD3 Tech can help review the network design and work out whether changes such as Split DNS would actually provide a benefit.
