2 LANS 1 Internet connection. Windows Server 2012 Essentials R2

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leetech

Prominent
Jul 6, 2017
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510
I need some help. I have a client that has moved into an office and is sharing their space. There is cat5e structured network around the building. There is a router with DHCP turned off providing the buildings owners with an internet connection to their network. What I want to do is connect my client's existing switch and windows server 2012 essentials r2 server (which is both a domain controller and a DHCP server) to the existing router (building owner's router) so that I can share the internet connection to my client. Essentially I will break out all of the ports on the network that my client will be using and connect to my client's switch. That switch then connects to my client's windows server. The existing network and all settings work just no internet connection. The server has two NIC cards if that helps at all. The building owner runs their own windows DHCP and domain controller server. Essentially the only physical connection between the two networks would be through the building owner's router. The router does have available ports. Any suggestions?

Oh and the firm that handles the IT for the building's owner is less than forthcoming with assistance. I have no control over the router onsite (only able to connect an ethernet cable to it).
 
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First and foremost, is the cost savings of using the building's internet connection worth it?
Using their internet you have no control:
No control if connection fails but to tell them, no control if they want to use 90% of the bandwidth, no control over security, no control over port forwarding.

Furthermore by putting your windows server directly on their network you are giving them access to the windows server.

If you are deadset on using this internet connection then I would at very bare bare minimum put a router between their connection and your windows server. You can of course disable dhcp on the router and use the windows server, but it provides a very essential buffer between the server and the other companies systems.
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leetech

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Jul 6, 2017
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510


Thanks bradleytancred. I'm not there quite yet. Give me a day or so.
 
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leetech

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Jul 6, 2017
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Solved. There is a SonicWall firewall in place between the router and the building owner's network. If I can get the other IT company to allocate an available port with a gateway address I specify and segregate the port from the other business network I should be good to go. If I get them to also turn of DHCP on that port my server can take over as DHCP server as well as being the domain controller. Happy days.
 
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boosted1g

Titan
Jun 12, 2013
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First and foremost, is the cost savings of using the building's internet connection worth it?
Using their internet you have no control:
No control if connection fails but to tell them, no control if they want to use 90% of the bandwidth, no control over security, no control over port forwarding.

Furthermore by putting your windows server directly on their network you are giving them access to the windows server.

If you are deadset on using this internet connection then I would at very bare bare minimum put a router between their connection and your windows server. You can of course disable dhcp on the router and use the windows server, but it provides a very essential buffer between the server and the other companies systems.
 
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