User guide

Network Settings
70 Firebox X Edge e-Series
About advanced external network settings
On the Network > External configuration page, select the Advanced tab to change the settings for link speed
or change the MAC address for the Edge’s external interface.
Select Automatic from the Link Speed drop-down list to have the Edge select the best network speed, or
select a static link speed that you know is compatible with your equipment. We recommend that you set the
link speed to Automatic unless you know this setting is incompatible with your equipment.
From the Maximum Transmission Unit (MTU) value control, select the maximum packet size, in bytes, that
can be sent through the interface. We recommend that you use the default, 1500 bytes, unless your network
equipment requires a different packet size.
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:
o One or more addresses on the external network
o The MAC address of the trusted network for the Firebox X Edge
o The MAC address of the optional network for the Firebox X Edge
 You cannot set the MAC address to 000000000000 or ffffffffffff.