How to Test Round Robin DNS

By Dave Wilson

Round Robin DNS is a server load balancing configuration in which a group of identically configured servers IP addresses are assigned to a single Internet host name or FQDN (Fully Qualified Domain Name) and DNS provides a different server IP address from the group each time a request to resolve the host name is received. After implementation, DNS Round Robin must be tested to confirm that every DNS request receives a different server IP address. Use the "ping" utility in Windows to test and verify Round Robin DNS configuration.

Things You'll Need

  • DNS host name or FQDN configured for DNS Round Robin
  • IP address of each server participating in load balancing through DNS Round Robin
  • IP address of the DNS server

Step 1

Click the "Start" button, then click the "Search" box and type "cmd" in the "Search" box. Press the "Enter" key.

Step 2

Type "ping x.x.x.x" in the command prompt window that appears, replacing "x.x.x.x" with the host name setup in the DNS Round Robin configuration, then press the "Enter" key. Verify that the IP address in the four replies received matches the IP address of one of the load balancing servers in the DNS Round Robin server group.

Step 3

Type "ping x.x.x.x" in the command prompt window, but replace "x.x.x.x" with the host name setup in the DNS Round Robin configuration and press the "Enter" key. Verify that the IP address in the four replies received matches the IP address of one of the load balancing servers in the DNS Round Robin server group. Also verify that the IP address is different than the last ping result received.

Step 4

Repeat the "ping" test until the IP address of each load balancing server in the DNS Round Robin group has been displayed in the command line output. If any of the load balancing server IP addresses are not received, verify that the IP address that was not received is configured in DNS. If no replies are received when running the "ping" test, verify network connectivity to the DNS server by repeating the "ping" test using the IP address of the DNS server.