DNS Issue

Hi

We have multiple DNS servers in a 2003 AD level domain that we use for Windows 7 clients.  If we do a NSLookup from a client to the third DNS server in the list we are getting "unknown Non-existant domain".  This is a new error and is creating issues routing mail between a couple of domains that we have shared contacts with.

Here is some for info:

DNS Servers . . . . . . . . . . . : 10.22.1.30
                                    10.22.1.31
                                    192.168.0.20


U:\Scripts\ServerDrive>nslookup 192.168.0.20
Server:  UnKnown
Address:  10.22.1.30

*** UnKnown can't find 192.168.0.20: Non-existent domain


DNS gives me headaches just thinking about it.  Any ideas on where to start?  Thanks.

Tony
tonyjoewalkerAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

becraigCommented:
Do you have reverse lookup configured  ?


http://technet.microsoft.com/en-us/library/cc961414.aspx
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Life1430Sr EngineerCommented:
correct ...it occurs when you do not have reverse lookup configured..even if you have check for the PTR record of the DC
0
ZenVenkyArchitectCommented:
Howmany DCs are there in the domain? This occurs and known thing in single DC domain. If you have more than 1 DC then you have to create sub domain zone (_msdcs.domain.local) and restart DNS and Netlogon. However if DCDiag /test:DNS is in passed state then you can ignore it.

DNS Best Practices
0
The Ultimate Tool Kit for Technolgy Solution Provi

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy for valuable how-to assets including sample agreements, checklists, flowcharts, and more!

SandeshdubeySenior Server EngineerCommented:
Ensure correct dns setting on DC/clients as this:

Best practices for DNS client settings on DC and domain members.
http://abhijitw.wordpress.com/2012/03/03/best-practices-for-dns-client-settings-on-domain-controller/

-Also make sure the IPv6 is configured to dynamic (Automatically) if it is win2008 server.

- Create reverse lookup as other suggested.I will also recommend to check the health of DC too.run dcdiag /q and repadmin /replsum and post the log if error is reported with Ipconfif /all details.
0
Bruno PACIIT ConsultantCommented:
Hi,

This error is not an error... This only means you have no reverse DNS zone in your DNS servers to resolve the IP 192.168.0.20 to a DNS name...
That's it.

By the way, having reverse DNS zone is NOT mandatory. Active Directory does not need reverse DNS zone to be functional.

Other experts explained you how to create a reverse DNS zone to avoid the "error" message but personally I'm not sure that your issue is about this.
You may have any DNS issue and linked it to this "error" message (again, it is not an error in fact) but are you sure that creating reverse DNS zone will resolve your issue ???

Can you tell us more about your issue of mail routing (reverse DNS zone misconfiguration may cause issue about spam detecting but it can not cause issue about mail routing...).

Have a nice day
0
tonyjoewalkerAuthor Commented:
We do have reverse DNS configured.  All I did was move the IP that is registered in DNS to first in the list in the rDNS record and it seems to all work now.  Thank you for all the responses!

Tony
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows Server 2003

From novice to tech pro — start learning today.