DNS Load Balancing

[budakpp89]

Hi and good day to all,

Is there any way to figure out or check whether there is DNS Load Balancing in network? Thank you

[Philip D'Ath]

Do a query from two different machines in a row and see if you get different results.  Repeat.

[budakpp89]

Hi p.dath and thanks for giving feedback. Since I am still new with the networking environment, could you please giving me some example how to do the query from two different machines, if you dont mind. Much appreciated for your help. 

[Philip D'Ath]

If you are on Windows, open a command prompt.

nslookup

set q=a

dnsentry.com

It will print out an 'A' record, or perhaps a group of them.  If you get a group of them then this implies some load balancing.  If you get a single entry that changes it implies load balancing.  If you get a group of them where the whole group changes then this implies load balancing.

Note some ISPs enforce a minimum TTL on DNS queries of an hour, so you may need to repeat the test more than once, over more than an hour long period, to be more confident on the results.

[budakpp89]

Hye p.dath, thank you!

[Philip D'Ath · Accepted solution]

I would be great if you could give me a rating or mark as correct ... :-)