2 Different VMS are in different virtual network

sns 9,226

2 Different VMS are in different virtual network, These Virtual are networks got created in the backend when I created the VM
I want to bring these 2 vms in to one network. Please suggest how to achieve this.

VM1 - IP is - 10.3.0.4
VM2 - IP is - 10.4.0.4

I want to bring VM2 in to VM1 IP network. Please suggest

Accepted answer

Andreas Baumgarten 98,621 Reputation points MVP

2022-08-13T10:25:58.377+00:00
Hi @sns ,

follow these steps to create a VM based on an existing managed disk:

Navigate to Disks in the Azure Portal

Find the OS Disk of the deleted VM (enter the name of the VM in the filter)

The Owner property of the disk should be -

Click on the disk

Select Create VM

Follow the Create a virtual machine wizard and select the Virtual Network and Subnet you want the VM connected to.

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Regards
Andreas Baumgarten
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sns 9,226 Reputation points

2022-08-13T10:48:15.857+00:00

Hi Andres,

I could create now VMTwo in same Vnet as VM one, However I am not able to join this VMTwo in to VMOne even though they are in same V-net, why?
Here , VMOne is already Domain Controller.

I am getting below error. Please advise on this, I raised below ticket on this few days ago.

https://learn.microsoft.com/en-us/answers/questions/957979/how-to-join-vm-other-other-vm-which-is-already-dom.html ( please assist this one also) Thanks.
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7 additional answers

Andreas Baumgarten 98,621 Reputation points MVP

2022-08-13T11:20:17.993+00:00

Hi @sns ,

you need to sort out your DNS settings.
If you want to join the VMTWO in your domain it is required that VMTWO is able to resolve the AD domain name to "find" a related Domain Controller.
Pinging the AD domain name should resolve to the IP of an AD domain controller. Otherwise you can't join VMTWO in your AD.
Which DNS settings are configured on the VNets (the old and the one you are using now) and the VMs?
Are you running your own DNS Server on the domain controller(s)?
Before you changed the vNet/Subnet you were able to join the VMTWO to the AD domain?

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten
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sns 9,226 Reputation points

2022-08-13T11:59:03.787+00:00

Hi Andrea,

When I configured few days ago as domain controller, in the same machine DNS also configured along with Active Directory domain controllers , this is in VMONE (onpremserver) , Please refer in following screenshot ( From VMONE )

and Before change to Vnet also it is giving same DNS error.

Please suggest now what needs to be done.
]1
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Andreas Baumgarten 98,621 Reputation points MVP

2022-08-13T12:30:03.74+00:00

Hi @sns ,

I would add a forwarder in the AD DNS server to the Azure DNS Server (168.63.129.16) to resolve names in the internet.
https://technogecko.net/msft/how-to-add-dns-forwarders-in-windows-server-dns/

In the next step add the IP of the AD DNS Server(s) on your vNet as DNS Server(s):

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten
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sns 9,226 Reputation points

2022-08-13T13:04:00.937+00:00

Hi Andreas,

I have added IP of DC , in the Azure AD DNS from respective V-Net, but still it is not resolving. PFA screenshtots.
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Andreas Baumgarten 98,621 Reputation points MVP

2022-08-13T14:39:41.193+00:00

Hi @sns ,

did you restart of the VMs after you changed the DNS Server of the vNet?

Please try a nslookup snstelangana.com on both VMs.
The output on both VMs should be the same.

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten
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sns 9,226 Reputation points

2022-08-13T15:00:01.72+00:00

Hi Andreas,

After adding DNS entry in the Vnet of azure and also joining domai in the VM2 I could see it is resolving DNS name. PFA

But why it is showing as UNKNOWN in the VMONE?

Thank you for your support.

Andreas Baumgarten 98,621 Reputation points MVP

2022-08-13T15:03:21.937+00:00

Are both VMs in the same vNet and the same Subnet?

If so, both VMs should have the same DNS Server in the ipconfig. And both servers should be able to resolve the VM names and the AD domain name.

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten

sns 9,226 Reputation points

2022-08-13T15:30:04.227+00:00

Hi Andreas,

Both are in same V-net and subnet as per my understanding, I have attached screenshots. Is there anything wrong in it?

Andreas Baumgarten 98,621 Reputation points MVP

2022-08-13T15:48:48.327+00:00

Hi @sns ,

everything looks good so far.
And If I got your right you were able to join the VM to your AD.

Nslookup shows Server: Unknown because you don't have a Reverse Lookup Zone configured in your DNS Server (for your Azure Subnets).
You could ignore this or if you like configure Reverse Lookup Zones for your Azure Subnets in your DNS.

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten

sns 9,226 Reputation points

2022-08-13T15:57:59.13+00:00

Hi Andreas, Where exactly I should configure reverse lookup in the azure portal? what is the purpose of reverse lookup?

Andreas Baumgarten 98,621 Reputation points MVP

2022-08-13T16:16:10.907+00:00

Hi @sns ,

The Reverse Lookup Zone will be created in the DNS on your DNS Server.
https://activedirectorypro.com/configure-dns-reverse-lookup-zones-ptr-records/

With the Reverse Lookup Zone for the related Subnets you are able to resolve IPs to computer names.

Forward Lookup Zones -> Resolve computer names (FQDN) to IP
Reverse Lookup Zones -> Resolve IP in Computer Names (FQDN)

If you like to learn more about DNS, networking and other cool stuff -> Internet Search Engines like Google, Bing and so on are very handy ;-)

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten
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2 Different VMS are in different virtual network

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