Watchguard Firebox X15 User Manual page 85

Change the MAC address of the external interface
Some ISPs use a MAC address to identify the computers on their network. Each MAC address gets one static IP
address. If your ISP uses this method to identify your computer, then you must change the MAC address of the
Firebox X Edge external interface. Use the MAC address of the cable modem, DSL modem, or router that
connected directly to the ISP in your original configuration.
The MAC address must have these properties:
The MAC address must use 12 hexadecimal characters. Hexadecimal characters have a value between
0 and 9 or between a and f.
The MAC address must operate with:
- One or more addresses on the external network
- The MAC address of the trusted network for the Firebox X Edge
- The MAC address of the optional network for the Firebox X Edge
You cannot set the MAC address to 000000000000 or ffffffffffff.
To change the MAC address of the external interface:
1. To connect to the System Status page, type
of the Firebox X Edge trusted interface.
The default URL is: https://192.168.111.1
2. From the navigation bar, click Network > External.
The External Network Configuration page appears.
3. On the Advanced tab, select the Enable override MAC address check box.
4. In the Override MAC address text box, type the new MAC address for the Firebox X Edge external
network.
You must enter the MAC address as a hexadecimal number.
Do not use extra characters, such as spaces or hyphens.
5. Click Submit.
You must restart the Firebox to see the changes.
If the Override MAC address field is cleared and the Firebox X Edge is restarted, the Firebox X Edge uses the
default MAC address for the external network.
To decrease problems with MAC addresses, the Firebox X Edge makes sure that the MAC address you assign
to the external interface is unique on your network. If the Edge finds a device that uses the same MAC address,
the Firebox changes back to the standard MAC address for the external interface and starts again.
User Guide
in the browser address bar, and the IP address
https://
Network Settings
73