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Child Domain and dns suffixes

Posted on 2016-11-18
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Last Modified: 2016-12-01
So I have a child domain and I can not ping a machine from the the parent domain with out putting in the FQDN.

and nslookup will not work unless I do the same.

So I'm thinking a DNS issue.  if I add the child domain name in the network properties of my machine I can ping and nslookup

when I run dcdiag /e /test:dns from parent domain controller I get this

at the bottome
-dns.png
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Question by:Michael Chonlahan
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by:footech
footech earned 250 total points
ID: 41893879
You will have to specify which DNS suffixes should be tried.  You can specify this manually in the NIC properties of a computer, but if you need to set for multiple machines it's best to use Group Policy (under Computer > Administrative Templates > Network > DNS Client > DNS Suffix Search List).
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by:Michael Chonlahan
ID: 41893890
Ok is there a reason why it is not automatically doing that?  on the child it automatily put that if I did a ipconfig /all it shows both but on the parent I have to put it on the nic card properties.
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DrDave242 earned 250 total points
ID: 41901800
Ok is there a reason why it is not automatically doing that?  on the child it automatily put that if I did a ipconfig /all it shows both but on the parent I have to put it on the nic card properties.

I'm fairly certain that this is normal behavior. A member of a child domain will (by default) add the child domain's DNS suffix and any parent domain suffixes to its search list (known as DNS devolution), but this doesn't happen automatically the other way around. If you think about it, the FQDN is required to uniquely identify the machine you're trying to reach. There's no way for the OS to know if the hostname "server1" should refer to server1.parent.com, server1.child.parent.com, or something else.

As footech mentioned, Group Policy is the best way to add the child domain suffix to multiple machines.
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Author Comment

by:Michael Chonlahan
ID: 41901801
Ok thank you I will work on setting up a group policy to add it.

Thank you all for the help
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by:footech
footech earned 250 total points
ID: 41903493
Thanks, DrDave242, for jumping in.  Somehow this had slipped past me.
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LVL 39

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by:footech
footech earned 250 total points
ID: 41909199
I'm not going to object, but it would have been more appropriate to split points, as both DrDave242 and I answered some of your questions.
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Author Comment

by:Michael Chonlahan
ID: 41909201
sorry did know I could do that new to this site.
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by:DrDave242
DrDave242 earned 250 total points
ID: 41909223
Footech's right; the points should be split. There's a way to do that after a question has been closed, as I've seen it done before, but I honestly don't know how to do it. Submit an attention request, maybe?
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by:footech
footech earned 250 total points
ID: 41909256
Yes, but I'm not going to ask anyone to do that.  Just keep it in mind for the next time.
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