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Name resolution order

cfmd
cfmd asked
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Last Modified: 2011-09-20
Dear all,

I've a philosophical question concerning DNS resolution.
We are using double attached workstation.
- Each Wks has two differents IP address on two differents Vlans.
- We are using Microsoft DNS. Each station is registered into the DNS with all her IP addresses :

Name        Address
Station1      IP1
Station1      IP2

How does the name resolution works in such a case?

Does the DNS gives the first address only? In that case, what is the process if this first address is not available?
Does it gives both adresses ? How does the computer who ask for the Ip address handle this?

Best regards

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Dear cfmd,
I belive it gives the IP based on the subnet. May be some more experts will help you on this

Cheers!

Author

Commented:
Someone told me that the DNS server is making Round Robin.
No documentation yet.

Author

Commented:
Ok, I got it.

http://support.microsoft.com/kb/467897/fr
Sorry, this article seems to exist only in French... Quite strange.

It is explain that :

1) the DNS server allways send the two address to the resolver (= the computer who makes the request).
2) The resolver always use the first entry.
3) The DNS server alternates the order of the two addresses for each request.
      first request it sends : IP1 + IP2
      second request it sends : IP2 + IP1
      etc...
yes thats what DNS will do, 1st request will recieve IP1 and the 2nd will recieve IP2. We use round robin DNS for load balancing on some of our web servers (because we are too cheap to do proper load balancing). Another way you could do this is have different DNS servers on each subnet not in active directory intergrated mode.
One question id ask though is why you have 2 connections on each pc ?
If you also only wanted one ip address to be registered in dns you could open the 2nd network connection in control panal, choose advanced options and on the DNS tab untick the option to register this connection in DNS.
This one is on us!
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