Fortinet FortiGate 1U Quick Start Manual page 28

Edit the internal interface.
Set the Addressing Mode to Manual and
set the IP/Netmask the private IP of the
FortiGate unit .
Go to Router > Static > Static Routes and
select Create New to add a default route.
Set the Destination IP/Mask to
0.0.0.0/0.0.0.0 , set the Device to wan1 ,
and set the Gateway to the gateway (or
default route) provided by your ISP or to the
next hop router, depending on your network
requirements.
A default route always has a Destination
IP/Mask of 0.0.0.0/0.0.0.0 . Normally, you
would have only one default route. If the
static route list already contains a default
route, you can edit it or delete it and add a
new one.
The FortiGate unit's DNS Settings are set to
Use FortiGuard Services by default, which
is sufficient for most networks. However, if
you require the DNS servers to be changed,
go to System > Network > DNS and add
Primary and Secondary DNS servers.
8 The FortiGate Cookbook 5.0.