Round Robin DNS is a technique involving changes to the DNS records The TTL or the Time to Live plays a very important part for Round Robin DNS to work. We will see some practical examples of DNS being using in Round Robin mode below:
1. If you need a site's http traffic to be distributed to multiple servers, you need to set the A records in the DNS zone for the domain as below :
domain.com. 300 IN A 123.123.123.123
domain.com. 300 IN A 123.123.124.124
domain.com. 300 IN A 111.112.113.114
[singlepic=6,320,240,,]
2. If you need a site's mail traffic to be distributed to multiple servers, you should point the domain's MX record to mail.domain.com and then you need to set the A records in the DNS zone for the mail record as below :
domain.com 3600 IN MX 0 mail.domain.com.
domain.com. 300 IN A 123.123.123.123
domain.com. 300 IN A 123.123.124.124
domain.com. 300 IN A 111.112.113.114
In the above examples you will see that the TTL for the A record has been set to 300 seconds. This is lower than normal and so the traffic will be rotated in Round Robin Mode.
Tags: DNS Setup
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