WatchGuard Technologies WatchGuard Firebox SOHO 6 - Manual (Page 50)

Chapter 4: Configure the Network Interfaces
32 WatchGuard Firebox SOHO 6.1
The most common method to distribute IP addresses is
dynamically using DHCP (Dynamic Host Configuration Protocol).
When your computer is connected to the network, a DHCP server
at your ISP automatically assigns it a network IP address. This
relieves the ISP of the responsibility to manually assign and
manage individual IP addresses.
Another method of dynamically assigning IP addresses is called
PPPoE (Point-to-Point Protocol over Ethernet). PPPoE combines
some of the advantages of Ethernet and PPP by simulating a
standard dial-up connection. It is popular among many ISPs
because it allows them to use their existing dial-up infrastructure
such as billing, authentication, and security for DSL and cable
modems. When configured to use PPPoE, the connection can be
manually connected or disconnected from the System Status page.
Contact your ISP to determine which method they use to assign
your IP address.
Configure the SOHO 6 External Network for
dynamic addressing
The SOHO 6 is configured to obtain its external address
information automatically using DHCP. If your ISP supports this
method, the SOHO 6 obtains all necessary address information
when it powers on and attempts to connect to the Internet. No
further configuration of the SOHO 6 is required.