Is it possible that one domain name has multiple corresponding IP addresses

Question

For example  when we connect to www example com  at first we try to connect to 192 0 2 1  And if first try fails  then we try 192 0 2 222   Is it possible  Can we register multiple backup IP addresses for one domain name

User · Accepted Answer

This is round robin DNS  This is a quite simple solution for load balancing  Usually DNS servers rotate shuffle the DNS records for each incoming DNS request  Unfortunately it s not a real solution for fail-over  If one of the servers fail  some visitors will still be directed to this failed server

User · Answer

You can do it  That is what big guys do as well   First query      host google com  google com has address 74 125 232 230 google com has address 74 125 232 231 google com has address 74 125 232 232 google com has address 74 125 232 233 google com has address 74 125 232 238 google com has address 74 125 232 224 google com has address 74 125 232 225 google com has address 74 125 232 226 google com has address 74 125 232 227 google com has address 74 125 232 228 google com has address 74 125 232 229   Next query      host google com google com has address 74 125 232 224 google com has address 74 125 232 225 google com has address 74 125 232 226 google com has address 74 125 232 227 google com has address 74 125 232 228 google com has address 74 125 232 229 google com has address 74 125 232 230 google com has address 74 125 232 231 google com has address 74 125 232 232 google com has address 74 125 232 233 google com has address 74 125 232 238   As you see  the list of IPs rotated around  but the relative order between two IPs stayed the same   Update  I see several comments bragging about how DNS round-robin is not convenient for fail-over  so here is the summary  DNS is not for fail-over  So it is obviously not good for fail-over  It was never designed to be a solution for fail-over

User · Answer

Yes this is possible  however not convenient as Jens said  Using Next generation load balancers like Alteon  which Uses a proprietary protocol called DSSP Distributed site state Protocol  which performs regular site checks to make sure that the service is available both Locally or Globally i e different geographical areas  You need to however in your Master DNS to delegate the URL or Service to the device by configuring it as an Authoritative Name Server for that IP or Service  By doing this  the device answers DNS queries where it will resolve the IP that has a service by Round-Robin or is not congested according to how you have chosen from several metrics

[dns] Is it possible that one domain name has multiple corresponding IP addresses?

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