Fortinet FortiGate-30B Manual Do Utilizador

Página de 56
Configuring 
Configuring NAT mode
FortiGate-30B FortiOS 3.0 MR6 Install Guide
01-30006-0459-20080505
21
4
Select OK. 
5
Repeat this procedure for each interface as required.
Configure a DNS server
A DNS server is a service that converts symbolic node names to IP addresses. A 
domain name server (DNS server) implements the protocol. In simple terms, it 
acts as a phone book for the Internet. A DNS server matches domain names with 
the computer IP address. This enables you to use readable locations, such as 
fortinet.com when browsing the Internet.
DNS server IP addresses are typically provided by your internet service provider.
To configure DNS server settings
1
Go to System > Network > Options.
2
Enter the IP address of the primary DNS server.
3
Enter the IP address of the secondary DNS server.
4
Select Apply.
Adding a default route and gateway
A route provides the FortiGate unit with the information it needs to forward a 
packet to a particular destination. A static route causes packets to be forwarded to 
a destination other than the default gateway. You define static routes manually. 
Static routes control traffic exiting the FortiGate unit-you can specify through 
which interface the packet will leave and to which device the packet should be 
routed.
In the factory default configuration, entry number 1 in the Static Route list is 
associated with a destination address of 0.0.0.0/0.0.0.0, which means any/all 
destinations. This route is called the "static default route". If no other routes are 
present in the routing table and a packet needs to be forwarded beyond the 
FortiGate unit, the factory configured static default route causes the FortiGate unit 
to forward the packet to the default gateway.
Initial PADT Timeout
Initial PPPoE Active Discovery Terminate (PADT) timeout in 
seconds. Use this timeout to shut down the PPPoE session if it 
is idle for this number of seconds. Your ISP must support 
PADT. To disable the PADT timeout, set the value to 0.
Distance
Enter the administrative distance, between 1 and 255 for the 
default gateway retrieved from the DHCP server. The 
administrative distance specifies the relative priority of a route 
when there are multiple routes to the same destination. A 
lower administrative distance indicates a more preferred route.
Retrieve default gateway 
from server
Enable to retrieve a default gateway IP address from the 
DHCP server. The default gateway is added to the static 
routing table.
Override internal DNS
Enable to use the DNS addresses retrieved from the DHCP 
server instead of the DNS server IP addresses on the DNS 
page on System > Network > Options. On FortiGate-100 
units and lower, you should also enable Obtain DNS server 
address automatically in System > Network > Options
Note: If you change the IP address of the interface you are connecting to, you must 
connect through a web browser again using the new address. Browse to https:// followed by 
the new IP address of the interface. If the new IP address of the interface is on a different 
subnet, you may have to change the IP address of your computer to the same subnet.