| Command | Purpose | |---------|---------| | copy tftp://<srv>/<file> flash: | Transfer IOS from TFTP | | verify /md5 flash:<file> | Verify file integrity | | no boot system | Clear existing boot statements | | boot system flash:<file> | Set new image to boot | | write memory | Save the configuration | | reload | Reboot the router | | show version | Confirm running IOS version | | show boot | Display current boot variable | | show license status | Verify licensing after upgrade | | dir flash: | List files in flash | | delete flash:<file> | Remove unwanted images |
. Because IOU was originally built for internal Cisco use, it checks the hostname and a specific magic number to generate a license key. i86bilinuxadventerprisek9ms1541tantigns3bin
Do not run this file on a connected device. Do not trust its integrity. And above all, remember the golden rule of vintage networking: If the filename has a typo, the kernel has a backdoor. | Command | Purpose | |---------|---------| | copy