Our ASA is configured to NAT certain public addresses 220.127.116.11/24 to certain private addresses 192.168.1.0/24. e.g.. 18.104.22.168 is static natted to 192.168.1.10. They are all listed in individual static nat statements.
Now we want to migrate to a new public address block 22.214.171.124/24. When I enter the command to nat 126.96.36.199 to 192.168.1.10 it says its already in use, can't do that. (staying with above example).
That's the rub. I'd like to use the new address simultaneously with the old address but the ASA won't let me do that.
The only other way I could think to do this would be to assign an additional private address to the internal server and create a new static map to the new address.
Thats a very valid option too. I've seen Windows handle multiple IPs on the same NIC very well. Linux should do it as well.
Alternatively, If you have a spare ASA or PIX, you could create a static map from the old 1.1.1.x to 2.2.2.x and connect the inside of that to the outside of the original ASA. And only keep one map from 2.2.2.x to 192.168.1.x on your original ASA. Just an idea that popped, I could be wrong here.