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Ethernet Interface Configuration for your Cable/LAN Internet Access

This section will help you define the parameters of the interface card necessary to map the needs of your cable/LAN access. Most of the parameters will already have been selected and the fields filled out with standard values. Start by validating those values.

IP Address 10.0.0.1

Fill this field if you have a static IP address for that interface. Make sure it is the one you have been assigned. Conflicting IP addresses may result in on-going intermittent Internet access problems.

Subnet Mask 255.255.255.0

Fill this field with the subnet mask corresponding to the network to which this interface is connected. Make sure it is the one you have been assigned.

Default Gateway 10.0.0.250

This is the gateway through which your Internet requests will go through. This parameter is crucial to enable your firewall machine to reach the Internet.


Then, you will have to indicate which boot protocol is to be used when this interface is initialized. This depends on the protocol used by your ISP. Select one of the following:

Finally, you can decide whether or not to automatically activate this interface every time you boot, the DHCP client and, optionally, the hostname.


Then comes the configuration of your host as a member of the Internet.

External System Name www.company.net
External Domain Name company.net

Fill in those fields with the external identification of your firewall machine.

External DNS 1 123.456.789.122
External DNS 2 123.456.789.123

Those DNS IPs generally correspond to your ISP's Domain Name Servers.