Make The Firebox A Dhcp Relay Agent; Use Static Ip Addresses For Optional Computers; Add Computers To The Optional Network - Watchguard Firebox X15 User Manual

Network Settings
About DHCP relay agents
One way to get IP addresses for the computers on the trusted or optional networks is to use a DHCP server on
a different network.
The Firebox can send a DHCP request from a DHCP client to a DHCP server at a different location through a
VPN tunnel. It gives the reply to computers on the trusted or optional network. This option lets computers in
more than one office use the same network address range. In this procedure, the Firebox is a DHCP relay agent.
You must set up a VPN tunnel between the Edge and the DHCP server for this feature to operate correctly.

Make the Firebox a DHCP relay agent

To configure the Firebox X Edge as a DHCP Relay Agent for the optional interface:
1. Use your browser to connect to the System Status page. From the navigation bar, select Network >
Optional.
The Optional Network Configuration page appears.
2. Select the Enable DHCP Relay on Optional Network check box.
3. Type the IP address of the DHCP server in the adjacent text box.
4. Click Submit. You must restart the Firebox X Edge for the new configuration to activate.
If the Firebox X Edge cannot connect to the DHCP server in 30 seconds, it uses its DHCP server to give
IP addresses to computers on the optional network. You must enable the DHCP server on the
optional network for the DHCP relay function to operate.

Use static IP addresses for optional computers

You can use static IP addresses for some or all of the computers on your optional network. If you disable the
DHCP server and you do not have a DHCP server on your optional network, you must manually configure the
IP address and subnet mask of each computer. You also can configure specified devices with a static IP
address. For example, this is necessary for a web server or network printer. Static IP addresses must be on the
same network as the Firebox X Edge optional interface. Computers with static IP addresses on the optional
network must use the optional interface IP address of the Edge as the default gateway or router. If a computer
does not use the Edge for the default gateway, it usually cannot get to the external network or the Internet.
To disable the Firebox X Edge DHCP server, clear the Enable DHCP Server on the Optional Network check
box on the Optional Network Configuration page and click Submit.

Add computers to the optional network

You can directly connect only one computer to the Firebox X Edge e-Series optional interface because there
is only one optional Ethernet port. To connect more than one computer to the optional interface, use a 10/100
BaseT Ethernet hub or switch with RJ-45 connectors. It is not necessary for computers on the optional network
to use the same operating system.
To add more than one computer to the optional network:
1. Make sure that each computer has a functional Ethernet card.
2. Set each computer to use DHCP. For more information, see
3. Connect each computer to the network. For more information, see
devices.
4. Restart each computer.
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Set your computer to connect to the
Connect the Edge to more than four
Firebox X Edge e-Series
Edge.