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    How to Secure the D6686 from Attack

    Issue

    Here is what you need to change in a D6686 to enable to the password for Telnet sessions and keep Internet attacker from attempting to utilize the second available tunnel:

    Requirements:
    a) The D6686 needs to be on the same subnet as the PC that will be used to change this.
    b) The D6686 IP Address (can be found using the Network Utility in the D6200 software)

    Solution

    1. Open a Telnet prompt from the Run dialog.
      2. At the Telnet prompt enter the following:
      a) open xxx.xxx.xxx.xxx (IP Address of the unit) and press Enter
      b) Since Telnet authentication is probably disabled by default, it should come up to a prompt with the unit short name, D6686>. If no short name is programmed in the unit, the prompt will merely be a > symbol; please modify the instructions below as they relate to your own installation.
      3. At D6686>, enter en and press Enter.
      4. At D6686(enable)#, enter conf and press Enter.
      5. At D6686(config)#, enter cli and press Enter.
      6. At D6686(config)#, enter login password (your new telnet password)
      7. At D6686(config-cli)#, enter telnet and press Enter.
      8. At D6686(config-cli-telnet)#, enter authentication enable and press Enter.
      9. After making that change, enter write and press Enter to save the changes.
      10. Enter ex and press Enter three times until you are at D6686(enable)#.
      11. At D6686(enable)#, enter reload and press Enter and enter yes and press Enter when prompted with Are you sure (yes/no)?.
      12. At this point the D6686 will reboot and the next time the Telnet command is attempted as in step 3, a login prompt will appear.
    Version history
    Revision #:
    2 of 2
    Last update:
    ‎06-14-2018 06:45 PM
    Updated by:
     
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