Duplicate IP address in two machines

Dear All,
The machines we manufacture have several Programmable logic Controllers (PLC's) and other Ethernet devices. For the ease of software updates and the complexity of changing the IP addresses within the devices we keep the same IP addresses for each machine.
What Cisco product could we use to view these machines from a single computer? And some tips in setting it up.
We are not able to change the port numbers of the programming software we use (Allen-Bradleys RSLogix).
I have been able to route from two IP addresses using an ASA5505 with policy rules, saying one IP address would route thru to machine one and another IP address routes thru to machine two. But I don't know how to do it from one IP address.
Each machine does not need to communicate with another.
I have attached a drawing.
Thanks in advance.

Hi John,
As I said, you either need to use two devices, or an ASA in multi context mode (creating two virtual firewlls completely independent of each other).
So, on each network device you NAT the IPs of Machine1 and so on with unique IPs, while the other network device, maps the Machine2 IPs with different NAT IPs.
ASA1 virtual firewall behind Machine1
192.168.100.180 - NAT to 192.168.1.180
192.168.100.184 - NAT to 192.168.1.184
192.168.100.173 - NAT to 192.168.1.173
192.168.100.174 - NAT to 192.168.1.174
ASA2 virtual firewall behind Machine2
192.168.100.180 - NAT to 192.168.2.180
192.168.100.184 - NAT to 192.168.2.184
192.168.100.173 - NAT to 192.168.2.173
192.168.100.174 - NAT to 192.168.2.174
The PC will connect to Machine1 and 2 using the NAT addresses:
192.168.1.180
192.168.1.184
192.168.1.173
192.168.1.174
192.168.2.180
192.168.2.184
192.168.2.173
192.168.2.174
The trick is to configure the vitrual firewalls so that each Machine will be associated to a different virtual device.
http://cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00808d2b63.shtml
Also, you can use two small routers for this instead of multimode ASA.
Please rate if this helped.
Regards,
Daniel

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Edited by: user13045950 on 05/12/2012 05:06

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Hi Dan,
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Message was edited by: Alan Ordway
Message was edited by: Alan Ordway

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