how to set up remote access to a site with two subnets

Hello all, I have a site with an old server that we are retiring. We have a new server prepared and running Windows 2012 R2 and a new domain. We are not taking anything over from the old server. We are even changing subnets.
This server is out of town so what I want to do is to make sure that I can install the new server but keep the old server up and running.
OLDSVR IP: (Windows 2003 server)
NEWSVR IP: (Windows 2012 R2 server with new domain info)

The current router IP: and is a Linksys WRT400N
Both servers have DHCP turned on so will have to figure that one out.

I need to be able to access both servers remotely. I already have ports open on the new server.

This is just short term. This is an accounting server and tax season is upon them so I don’t want to create a bunch of downtime, just do it slowly and do it remotely. The business is an hour away so would like to do the majority of work remotely.

Am I asking too much here? Can this be done?
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Salah Eddine ELMRABETTechnical Lead Manager (Owner)Commented:

Could you please explain from where you want to access the server remotely? is it from you inside network or outside?

Best Regards.

On the new server, add a secondary IP Address on the network:

In the TCP/IPv4 properties (where you have the static IP Address of, click the 'Advanced' button.  Add an IP Address on the network.

All that is left is to change the default Microsoft RDP listening port on one of the servers (I would change it on the Server 2003 machine).  The default port number for RDP is 3389.  Change the old server to 3388 and perform your port forwarding accordingly.

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Fred MarshallPrincipalCommented:
Another approach would be to plug in a cheap commodity router between the old LAN and the new LAN.
The WAN port on the old LAN.
The LAN ports to the new LAN - and the router address is the gateway for the new LAN or for the server.. whichever.
Then you should be able to access everything subject to any port forwarding you need to do.

When the time comes, you change the LAN address of the upstream router to match the LAN address of the temporary router, remove the temporary router and turn off the old LAN.
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Windows Server 2012

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