Importance of Multiple DNS Servers
In an organization, where there are several computers connected to each other, administrators mostly install more than one DNS servers for fault tolerance purposes. This means that in case one DNS server fails to respond properly or is down because of any reason, the names can be resolved by the second available DNS server in the network.
In order to make fault tolerance work, each client computer is assigned with multiple DNS addresses, where the IP address of the main DNS computer is provided as the preferred DNS server address, and the IP address of the secondary DNS computer is provided as an alternate DNS server address.
How DNS Server Fault Tolerance Works?
When a computer is assigned with preferred and alternate DNS server addresses, every time a computer wants to communicate with another computer in the network or with the Internet, the query is sent to the DNS server whose IP address has been provided as preferred DNS server in the client computer. In case the preferred DNS server is not available, or fails to resolve the query, the query is then forwarded to the DNS server whose address has been provided as alternate DNS server in the client computer.
How to Assign Multiple DNS Server Addresses?
Windows 8 also allows administrators to provide more than two DNS address. To provide multiple DNS server addresses in Windows 8 computer, steps below must be followed:
- Use the credentials of administrator account to log on to Windows 8 computer, to which multiple DNS server addresses are to be provided.
- Click Desktop tile from the Start screen to reach the desktop.
- Once on the desktop screen, hover mouse to the bottom right corner of the window.
- From the displayed options in the right, click Settings.
- Click Control Panel from the displayed Settings pane.
- On Control Panel window, click Network and Internet option
- On Network and Internet window, click Network and Sharing Center category from the right pane.
- On Network and Sharing Center window, from the left pane, click Change adapter settings.
- On the Network Connections window right-click the network interface card (NIC), on which multiple DNS server addresses are to be provided.
- From the context menu that appears, click Properties.
- On network adapter’s properties box, double-click Internet Protocol Version 4 (TCP/IPv4) from This connection uses the following items list.
- From the bottom of Internet Protocol Version 4 (TCP/IPv4) Properties box, click Advanced button.
- On Advanced TCP/IP Settings box, go to DNS tab.
- Once on the selected tab, click Add button under DNS server addresses, in order of use section.
- On TCP/IP DNS Server box, type the correct DNS server address in DNS server field.
- Click Add button to add the DNS server address to the selected NIC.
- Repeat steps from 14 to 16 to add as many DNS addresses as desired.
- Back on Advanced TCP/IP Settings box, click OK.
- Back on Internet Protocol Version 4 (TCP/IPv4) Properties box, click OK to save the modified settings.
- Close all the opened boxes and windows when done.