Cisco 675/678: Changing the Username Without a Management Cable

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Changing the username in a Cisco without a management cable.

Be sure the PC is directly connected to the Cisco without another router in the way.

  1. Open a DOS window.
    • Start -> Run -> command -> OK
  2. Locate the gateway of the PC they're working on.
    • Type ipconfig in the DOS window and find the gateway line
  3. Type telnet gateway-ip and hit Enter
  4. You should get an authentication prompt from the Cisco
  5. Try just hitting Enter
    • If that doesn't work, Try your FRII assigned password.
      • If that doesn't work, you will have to identify what the password is.
        • If you can't identify what the password is, then a management cable will be required and you will have to reset and reconfigure the Cisco.
  6. If hitting Enter worked you should see a CBOS> prompt.
  7. Type enable and hit Enter.
  8. You will be prompted for a password again, try just hitting Enter again.
    • If that works, you will see a CBOS# prompt.
      • If not, you will have to identify what the password is again.
  9. After you have successfully entered enable mode type the following.
    set ppp wan0-0 new-username
    write
    • Hit Enter after each line.
  10. This will change the username the Cisco is using to authenticate.
    • Optionally, you can type reboot and hit Enter to reboot the Cisco and force it to reconnect with the new username right away.
  11. Once the Cisco is using the new username, click the 'X' in the upper-right corner of the window.
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