Solution for network connection with same IP address (NAT, VRF, etc.)

[WangSteven02215]

Hi,

As shown in the picture, each industrial PC is connected to the L2 Switch (No VLAN). 

The customer wants to install a data collection server and a data monitoring server. The data must be transferred from the industrial PCs to the data collection server and then the data collection server must send data to the data monitoring server.

However, since the IP address of Industrial PC cannot be changed, there are duplication of IP address (PC 1 and 3) and same network (192.168.100.0/24). For newly installed servers, IP settings can be freely set.

To solve this problem, I could think about using NAT and VRF. However, as aspect of cost, maintenance, etc., I cannot decide best network configuration because of insufficient experience. 

Please give me advice how to overcome this situation and build a network. If you suggest detailed network configuration including command line, that would be really helpful.

Thank you very much.

[WangSteven02215]

I really appreciate your help. I think that your test was working well because you probably applied VLANs (VLAN 10, 20, 30, and 40) to the switches circled in blue in the image. But, I cannot change VLAN setting of the switches circled in blue. So, it is very difficult to solve the problem. Could you give me the solution for my case? Thanks.