Active Directory : Conditional redirectors

Question

Hi

I have two domain in two forests with conditional redirectors.

However, it displays : Unable to Resolve. Is this normal?

When i do Nslookup NameOfMyDC.com

Server: UnKnown
Address: :: 1

Non-authoritative response:
Name: NameOfMyDc.com
Address: 172.31.150.20

Why Server : Unknown ?
Thanks in advance for your help.

Answer 1

Hi,

Yes It's a normal behavior because there is no PTR entry for 172.31.150.20 in order to translate the IP to hostname.

When you type nslookup 172.31.150.20 there is no answer.

If you want see the server Name you have to create a new PTR record in DNS server if you have alreday created the revers DNS zone for the subnet 172.31.150.x and you get the server name when you launch the following command:

`nslookup 172.31.150.20`

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Answer 2

Hi,

Based on my understanding , you want to set up Conditional Forwarders between 2 forests for name resolution ,right?
When you set up Conditional Forwarders :
Type the IP address of the DNS server that will resolve queries from the domain you entered in the previous step and press ENTER.
If the DNS server can be reached, after a few seconds the Server FQDN name field will display the name of the DNS server.
And you can check if the DNS can be resolved as following :

If the Conditional Forwarders created successfully, then when you run nslookup, the dns name should be able to resolved :

Best Regards,

Answer 3

Hi, Thanks for your answer.

I have build the two conditional redirector for the 2 forest.

From computer on Domain A

C:\Users\Test>nslookup Computer.domainB
Serveur : DC.DomainA
Address: 172.31.150.20

Réponse ne faisant pas autorité :
Nom : Computer.domainB
Address: 172.31.160.92

C:\Users\Test>nslookup DC.domainB
Serveur : DC.DomainA
Address: 172.31.150.20

Réponse ne faisant pas autorité :
Nom : DC.DomainB
Address: 172.31.160.20

From computer on Domain B

C:\Users\test>nslookup computer.domainB
Serveur : Unknown
Address: 172.31.160.20

Réponse ne faisant pas autorité :
Nom : Computer.domainA
Address: 172.30.10.100

C:\Users\test>nslookup dc.domainA
Serveur : Unknown
Address: 172.31.160.20

Réponse ne faisant pas autorité :
Nom : DC.domainA
Address: 172.31.150.20

Why i got Server : Unknown ? is it's normal ?

On control panel of redirector : Resolution Impossible

Thanks in advance

Answer 4

Hello,

Thanks a lot for your help. I could correct the problem and above all understand.

THanks