Add remote servers to LAN

Remote servers: Windows server 2012 R2 Std.
LAN: Windows 2008 R2 Std, Active Directory

The purpose of these servers is to access email on the member server from the web.

We have a remote member server and DC hosted in VMs.

Mail on server is non-Exchange 3rd party program.

We'd like to administer both from the LAN.

The member server has a public IP.

From the LAN, I can RDP the member server via the public IP, but not the DC.

Is this setup wrong?

Do we need a public IP for the DC also?
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NVITEnd-user supportAsked:
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NetExpert Network Solutions Pte LtdTechnical SpecialistCommented:
Based on your post I understand that, the servers are hosted in 3 locations

LAN, remote servers and DC
You are able to manage both LAN and remote member servers , but not able to login to DC servers

Yes, either you need to have public ip address for DC servers to do RDP or you should have VPN between your LAN to DC
NVITEnd-user supportAuthor Commented:
I forgot to mention... we'd like the DC as part of same LAN
NetExpert Network Solutions Pte LtdTechnical SpecialistCommented:
For your requirement, you need to have public ip address to manage DC servers

Does the DC connected to internet ? do you have existing access to your DC networks?
NVITEnd-user supportAuthor Commented:
Solved: I connected to the DC via RDP. Initially, our provider gave 1 public IP. I thought that was just for the member server. After joining the member to our AD LAN, I could RDP to it using its LAN IP.

After that, I assumed I would not be able to connect to the DC since the public IP was used by the member. I was wrong.

I RDP'd again via the public IP. This time, it connected to the DC.

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NVITEnd-user supportAuthor Commented:
See my post for reason.
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