How To Open a Port On Cisco Router?
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1. Log in to your Cisco router using either a SSH or Telnet connection.
2. Type in the following command : enable
3. Then type in your enable password.
4. Execute the command: configure terminal
5. Enter the interface configuration mode with this command: interface [type number]
6. Turn access control on with this command: ip access–group [name_of_the_access_group] in
7. Enable port forwarding with this command: ip nat inside source static [private_IP] [public_IP] [port_number]
8. To save the changes, use this command: write memory
9. To exit the configuration mode, use this command: end