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c2600-ipbasek9-mz.124-25c.image c3620-advipservicesk9-mz.124-16.bin c7200-a3jk8s-mz.122-26c.image c2800nm-advsecurityk9-mz.124-24.bin

c3620-a3jk8s-mz.122-26c.image

Cisco's naming convention provides a wealth of information about the capabilities of the software: How to configure Dynamic NAT on Cisco IOS Router - Page 3 c3620-a3jk8s-mz.122-26c.image

It looks like you want to similar to the pattern: c2600-ipbasek9-mz