How to Permanently Disable Ethernet0/7 on a Cisco ASA 5505

Disable a Cisco ASA 5505 port to increase security.

The Cisco ASA 5505 is a feature rich firewall appliance that provides a high level of protection to any network in which it is installed. To increase the level of security, it is wise to disable any software features and hardware that are not in use on the ASA 5505. By following a brief procedure you can permanently disable a port such as Ethernet0/7 on the ASA 5505 appliance.

Things You'll Need

• Telnet access password for the Cisco ASA 5505
• Privileged Exec mode password for the Cisco ASA 5505
• Cisco ASA 5505 with telnet access enabled
• IP address of the inside interface on the Cisco ASA 5505
• Microsoft Windows 7 computer with Microsoft telnet client software installed

Instructions

1. Click the "Globe" start button on the Windows 7 computer, and then click "Programs," and then click "Accessories."

2. Right-click the command line icon and click "Run as Administrator."

3. Type "telnet 10.0.0.1," but replace "10.0.0.1" with the IP address of the Cisco ASA 5505. Touch the "Enter" key. Type "telnet 10.0.0.1," but replace "10.0.0.1" with the IP address of the Cisco ASA 5505. Touch the "Enter" key and the telnet application will connect to the ASA appliance.

4. Type the telnet access password for the ASA 5505 when requested at the command prompt and tap the "Enter" key.

5. Type "enable" on the command line, and then press the "Enter" key.

6. Type the Privileged Exec password for the ASA 5505 when requested at the command prompt and tap the "Enter" key.

7. Type "configure terminal" on the command line and press the "Enter" key.

8. Type "interface ethernet0/7" at the command prompt and press the "Enter" key.

9. Enter "shutdown" on the command line and press the "Enter" key.

10. Type "end" and press the "Enter" key. Then type "copy run start" and press the "Enter" key to save the new configuration.

References

• Cisco: Cisco Security Appliance Command Line Configuration Guide, Version 7.2 - Getting Started [Cisco ASA 5500 Series Adaptive Security Appliances]
• Cisco: Cisco ASA 5505 Getting Started Guide, Version 7.2 - Configuring the Adaptive Security Appliance [Cisco ASA 5500 Series Adaptive Security Appliances]
• Cisco: Cisco ASA 5505 Getting Started Guide, Version 7.2 - Scenario: Remote-Access VPN Configuration [Cisco ASA 5500 Series Adaptive Security Appliances]