Isolating and Accessing 2 Subnets Using Same Address Range

Oct 17, 2018
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I have an instance where I need to access a test environment that is using a 192.168.1.0/24 subnet which is unfortunately the same subnet as the office LAN. I cannot change the address of the devices under test on the Test LAN, nor can I change the addressing of the office environment.

My PC connects to the office LAN via wired connection, which means I could use my wireless to connect to the Test LAN. I am drawing a mental block of how I would configure a wireless router to serve out addresses on a different subnet (Say 192.168.2.0/24), allow for wired devices to be on the Test LAN with 192.168.1.0/24 subnet and use something like port forwarding to access the services I need for the device under test. Assume I have access to network equipment capable of running Open Source firmware (like dd-wrt).

I also do not want the Test LAN devices to access the Internet. So the two 192.168.1 based subnets cannot access one another (The office LAN has Internet access).
 
If you are able to use a static with office LAN, how about forcing to /25? Force segment, in your machine only, to use the first 128 hosts for office, and remaining 128 host for test. Just on top of my head, haven't done any math.

Now u can always configure both NICs for the same subnet as long as only one is enabled.

Running a VM talking to second NIC only?