About Changing The Ip Address Of The Trusted Network - Watchguard Firebox X15 User Manual

Network Settings
About configuring the trusted network
You must configure your trusted network manually if you do not use the Network Setup Wizard.
You can use static IP addresses or DHCP for the computers on your trusted network. The Firebox X Edge e-
Series has a built-in DHCP server to give IP addresses to computers on your trusted and optional networks. You
can also change the IP address of the trusted network.
The factory default settings of a Firebox X Edge DHCP server automatically give IP addresses to computers on
the trusted network. The trusted network starts with IP address 192.168.111.1. It is a class C network with a
subnet mask of 255.255.255.0. The Edge can give an IP address from 192.168.111.2 to 192.168.111.254. These
are private addresses that are not seen outside the trusted network. The factory default settings use the same
DNS server information on the internal and external interfaces.
If necessary, you can disable the DHCP server. Or, you can use the Edge as a DHCP relay agent and send DHCP
requests to a DHCP server on a different network using a VPN tunnel. You can also use static IP addresses for
the computers on your trusted network.
Any changes to the trusted network configuration page require that you click Submit. If necessary, the
Firebox restarts.

About changing the IP address of the trusted network

If necessary, you can change the trusted network IP address. For example, if you connect two or more Firebox
X Edge devices in a virtual private network, each Edge must use a different trusted network address. If the two
sides of the VPN use the same trusted network IP addresses, one side must change the trusted network IP
address range so that it is different from the other side. For more information, see
a VPN.
If you change the IP address of the Firebox X Edge trusted interface, you must use the new IP address
in your browser address bar to connect to the Edge's web management interface. For example, if
you change the Firebox X Edge trusted interface IP address from the default 192.168.111.1 to
10.0.0.1, then you must use https://10.0.0.1 to connect to the Firebox X Edge. Your computer's IP
address must also be changed so that it is in the new trusted network IP subnet range.
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What you need to create
Firebox X Edge e-Series