DNS ISSUES

I will Try to explain as best i can....

I Have 3 Sites, A< B< C<

Sites A has 2-2003 Domain Controllers and 1-2008 Server with Hyper-V installed. In this 2008 Box i have a Virtual Machine Running 2008 DC...will call these Servers A1 and A2...Server A1 holds all FSMO Roles...A2 is our main File Server...Server 2008 DC in Virtal Machine we will call VM2008

Site B has 1-2008 DC running on Box...will call this Server B1...this is in a totally different site in AD Sites and Services..this house all finacial applications...Different subnet also from all sites....

Site C ...just exists...NO DC...

All Sites are connected by a MPLS Circuit...
All these machines are DC, GC, WINS...
All Sites are on Different Subnets...

Issue keep having DNS Issues...when i go to Site A into Server A2 (File Server) and into the DNS Settings and go to add either 2008 DNS Server into that to manage it...i cannot..it just says Server Unavailable or down....The Servers are up...not down...Sometimes AD wont be able or takes long to replicate to these Servers.....Was working and then all of a sudden Servers Started not running and having differnt DNS errors messages everytime i log in....

Question...IS there something in Server 2003 or 2008 in DNS that you have to do for them to reconize each other?????

Also notieced in Reverse lookup zones in DNS on Server 2003 that there is not record of the 2008 Servers...nor can i add one...I belive...Hope this makes Sense.....

When i use nslookup on Server A1 in site A and type in Server name of Site B (B1) it resolves okay...when i use IP Address...it fails with IP ADDress unknow....hope some of this makes sense.....

DNS Settings for Servers and Sites
 
Site A server A1 is pointing to itself and then A2 DC
Site A Server A2 is Pointing to Server A1 and then to Itself.
Site A Server VM2008 is Pointing to A1 and then A2
Site B Server is pointing to ITsefl and then Site A server A1

thanks for any help.....



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westhelpdeskAsked:
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Darius GhassemCommented:
Point all DCs to themselves. Run ipconfig /flushdns, ipconfig /registerdns, and dcdiag /fix.
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webbster20Commented:
Did you try adding via IP?
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westhelpdeskAuthor Commented:
three different answers...which one to choose.....when replying to this message could you please if possible state why it is i should do what you are suggesting...as for webster20..not sure i know what you mean??/ tryed adding ip but cant for different subnet.....

Dariusq...someone mentioned doing this might cause an issue in another thread called...DNS looping...if i believe that is what this is called..you might be familar with particulars....

Cighn..this thread is for multiple forest....i have one forest and one domain...just 2 different sites.....in same domain....
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Darius GhassemCommented:
Actually it is called DNS island which was back in Windows 2000 server which was fixed in 2003 Server. The recommend position is to point to themselves. If you have some type of network issue or some other replication problem then the DC will be updating it's records so at least other DCs that are still replicating properly can get the most updated records.
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westhelpdeskAuthor Commented:
if i point all dc to themselves as the primary then who should i put in as secondary???
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Darius GhassemCommented:
You can actually add more then just two by going into your Advance option then DNS tab. I would add at least 3. For secondary you can put in another DNS server onsite or one at HQ.
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westhelpdeskAuthor Commented:
IN DNS Management console where it has interfaces...should this be

ALL IP Addresses or ONlY this One for who is going to serve DNS Requests...
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Darius GhassemCommented:
You should only have one interface listed. Do you have more then one nic enabled? If you do I recommend disabling all NICs except for one.
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westhelpdeskAuthor Commented:
i only have one interface or ip address listed but there is 2 check marks...one that says all ip addresses and the one below that says only this one...just wondering what i should check...by default there is one ip address in there and it says all ip addresses..
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Darius GhassemCommented:
Then that is fine.
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westhelpdeskAuthor Commented:
just another quick question...i should run this......Point all DCs to themselves. Run ipconfig /flushdns, ipconfig /registerdns, and dcdiag /fix. on all DNS Servers correct???????
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Darius GhassemCommented:
Correct
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westhelpdeskAuthor Commented:
Seems to of worked....thanks alot......
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