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Configure GTD with DNS Failover

1

The Global Traffic Director gives clients the ability to geographically respond to queries differently based on region. It is useful is you have multiple different servers located around the world and you want to direct your traffic to the closest server. For example, you can have your ‘www’ record for your domain point to a web server at 1.10.10.1 in Asia and a different web server at 1.10.20.2 in the United States on the west coast. Querying clients in the Asia region are sent to 1.10.10.1 while US querying clients are sent to 1.10.20.2. We also have two additional servers set up at 1.10.10.3 in the United States on the east coast and 1.10.10.4 as the default IP. This is what we will configure below for example-1.com. We will also configure DNS Failover service on the Asia and US West Coast A records so in the event that 1.10.10.1 in Asia is offline, all traffic will be sent to the United States West Coast (the next closest geographical region) and in the event 1.10.20.2 in the United States West Coast is offline, all traffic will be sent to the US East Coast (the next closest geographical region).

USER ACTION
STEP 1: To start, enable and configure GTD for the domain.

 

USER ACTION
STEP 2: Now we will set up a contact list for notification of the failover event. Select the “Config” menu

 

USER ACTION WHAT YOU WILL SEE
STEP 3: Click on “Contact Lists” 4

 

USER ACTION WHAT YOU WILL SEE
STEP 4: Click on the plus sign (+) to add a new contact list 4

 

USER ACTION
STEP 5: Give the contact list an identifiable name and enter the email addresses you would like included in the list, one per line. Groups are discussed in a tutorial here, however if you are the only user for your account your contact list should be part of the default group. Otherwise, it should be part of whatever group is set up to have management permissions for the domain.

 

USER ACTION WHAT YOU WILL SEE
STEP 6: Click “Submit”. 4

 

USER ACTION
STEP 7: Now we will set up DNS Failover with the defined GTD records.

 

USER ACTION
STEP 8: Select the DNS Menu

 

USER ACTION WHAT YOU WILL SEE
STEP 9: Select Managed DNS 4

 

USER ACTION WHAT YOU WILL SEE
STEP 10: Select a domain from the either the “Recently Updated Domains” box, or start typing the domain name in the textbox on the “Select Domain” tab. 4

 

USER ACTION
STEP 11: Select the “Records” tab if it is not already selected. For the purpose of this tutorial, we have configured example.com with 4 GTD A records, one for each region.

 

USER ACTION WHAT YOU WILL SEE
STEP 12: Under the “SM / FO” column next to the first A record, click “off” to configure DNS Failover. 4

 

USER ACTION
STEP 13: If you require assistance with the different options for configuration of DNS Failover, please view the DNS Failover Tutorial. We will add a new failover configuration for the ASIA_PAC www.example.com record (with a primary IP of a web server at 1.10.10.1 in Asia), If the Asia server is offline, we will send traffic to the next closest geographical location which is our web server on the US West Coast at 1.10.10.2. You can take this one step further and if both Asia and the US West Coast are offline, you can sent traffic to the US East Coast at 1.10.10.3.

 

USER ACTION WHAT YOU WILL SEE
STEP 14: Click Ok 4

 

USER ACTION
STEP 15: You can use this same idea to create redundancy for any GTD region defined record.