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Network configuration
Configuring the wan1 and wan2 interfaces for PPPoE
Changing the wan1 and wan2 interface MTU size to improve network
performance
FortiGate-60R Installation and Configuration Guide
4
Select Connect to DHCP server to automatically connect to a DHCP server.
If you do not select Connect to DHCP server, the FortiGate unit will not connect to a
DHCP server. You can deselect this option if you are configuring the FortiGate unit
offline.
5
Select OK.
The FortiGate unit attempts to contact a DHCP server from the wan1 or wan2
interface to set the wan1 or wan2 IP address, netmask, and the FortiGate default
gateway IP address. When the FortiGate unit gets this information from the DHCP
server, the new addresses and netmask are displayed in the IP address and Netmask
fields.
Use the following procedure to configure the wan1 or wan2 interface to use PPPoE.
This configuration is required if your ISP uses PPPoE to assign the IP address of the
wan1 or wan2 interfaces.
1
Go to System > Network > Interface.
2
For the wan1 or wan2 interface, select Modify
3
Set Addressing mode to PPPoE and select OK to change to PPPoE mode.
4
Enter your PPPoE account user name and password.
5
Select OK.
The FortiGate unit attempts to contact the PPPoE server to set the wan1 or wan2 IP
address, netmask, and the FortiGate default gateway IP address. When the FortiGate
unit gets this information from the PPPoE server, the new addresses and netmask are
displayed in the wan1 or wan2 IP address and netmask fields. If the PPPoE
connection with your ISP is dropped, the FortiGate unit automatically attempts to
reestablish the connection.
6
Select Connect to PPPoE server to automatically connect to the PPPoE server.
If you do not select Connect to PPPoE server, the FortiGate unit will not connect to a
PPPoE server. You can deselect this option if you are configuring the FortiGate unit
offline.
7
Select OK.
To improve the performance of your Internet connection, you can adjust the maximum
transmission unit (MTU) of the packets that the FortiGate unit transmits from its wan1
and wan2 interfaces. Ideally, you want this MTU to be the same as the smallest MTU
of all the networks between the FortiGate unit and the Internet. If the packets that the
FortiGate unit sends are larger, they get broken up or fragmented, which slows down
transmission speeds.
Trial and error is the only sure way of finding the optimal MTU, but there are some
guidelines that can help. For example, the MTU of many PPP connections is 576, so if
you connect to the Internet via PPP or PPPoE, you might want to set the MTU size to
576. DSL modems also have small MTU sizes. Most Ethernet networks have an MTU
of 1500.
Configuring interfaces
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111
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