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mantech1

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ASA 5510 with multiple internal addresses

I have an ASA 5510 that I am configuring for my network.  We are breaking off from our corporate parent to run autonomously.  When I make the switch, I would like to change my internal IP addressing scheme.  The current scheme uses 172.x.x.x with a subnet mask of 255.255.248.0.  I want to move to 10.x.x.x with a subnet of 255.255.0.0.

I will be able to change all the computers and servers at one time to the new configuration, but some of our floor equipment I cannot change.  I will assign new addresses and someone else will change the addresses over the next few days (weeks).  I need a solution so that my pcs can still see the equipment, and vice versa.

In my test environment, I have given the internal interface the new ip address (10.1.0.1) and a sub interface the old ip address (172.1.0.1).  with a PC set up on the 10.x.x.x network, I can ping the 10 address on the ASA, but not the 172 address, and I cannot ping a device with a 172 address.  When I give the PC a 172 address, I can ping the device, but I still cannot ping the 172 address on the ASA.

What I am doing wrong?  Does the sub interface count as a physical interface?  (I am licensed for 4.)  Will I need to setup a router internally and a static route for on the ASA?

I am new to the ASA, so I am sorry if this question is simplistic.
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Les Moore
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mantech1

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It was not what I wanted to hear, but it was an answer to my question.  So I will give each of you some points.

We found another way around the issue.  Thank you anyway.