I am curious, I am analyzing the DNS section for the website imgur.com. My doubt is that when I run "dig imgur.com" dig only returns an IP address, if I run again the same command dig returns another IP address or sometimes the same.
Another question: By using dig www.imgur.com get a CNAME to another domain, is this normal?, Can someone explain to me?
Thanks
You should check Round-robin DNS.
Round Robin DNS is a technique of load distribution, load balancing, or fault-tolerance provisioning multiple, redundant Internet Protocol service hosts, e.g., Web server, FTP servers, by managing the Domain Name System's (DNS) responses to address requests from client computers according to an appropriate statistical model.
In its simplest implementation, Round-robin DNS works by responding to DNS requests not only with a single potential IP address, but with one out of a list of potential IP addresses corresponding to several servers that host identical services. The order in which IP addresses from the list are returned is the basis for the term round robin. With each DNS response, the IP address sequence in the list is permuted. Usually, basic IP clients attempt connections with the first address returned from a DNS query, so that on different connection attempts, clients would receive service from different providers, thus distributing the overall load among servers.
