I recently downloaded CNA and have found it quite useful. I am trying to upgrade the IOS on a router using the software upgrade utility included in CNA. I have read that the utility requires a .tar file and that it completely writes over the flash memory in the router.
I have never used a .tar file before in regards to IOS upgrades. I have always used .bin. Can I download a .tar file from cisco.com or do I need to create it?
I have read a cisco whitepaper that vaguely described how to create a .tar file, but the syntax in their description did not match up on my router. Any ideas?