Not sure if this is the right forum but we will try.
I have two separate closed networks, both with an ip range of 192.168.1.xxx, with a large number of devices in each net so that I cannot combine them into one. We shall call them NetA and NetB.
I have a Point 2 point connect to NetA using a pair of Cisco 1841 routers. For each router, I have Slot 0 populated with a WAN 10/100 card to support the P2P. On my end of the p2p, i have used both FE0 and FE1 to provide to access lines, with FE0 being subnet .2.xxx and fe1 being .3.xxx. This has been working just fine for us for over a year.
I now have NetB access via a dedicated fiber. Have the fiber running into a switch, and then we have a laptop on the switch that lets us administer the network and devices.
What I want to do now is to somehow bring these two networks together into one router, and then be able to translate NetB to a different subnet(say.7.xxx for example). My ultimate goal is to be able to use one workstation (with one nic) to support both nets. So, if at my workstation I type 192.168.1.100,I get NetA. If I type 192.168.7.100, I get NetB
So, I'm looking for ideas as to the most efficient way to service both of these networks from one workstation. If I have two have two nics with different IP addresses, then so be it. However, if I can bring the p2p into a different style router that can also have the fiber connection without using a fiber converter to take it to copper, then even better.
Any and all suggestions welcome. And as I said, I cannot change the IP ranges on either subnet due to vendor hard coding and the number of devices being used.