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Select Manual, DHCP, or PPPoE to set the addressing mode for this interface.

Manual

Select Manual and enter an IP address and netmask for the interface. The IP address of the interface must be on the same subnet as the network the interface is connecting to.

Two interfaces cannot have the same IP address and cannot have IP addresses on the same subnet.

Note: Where you can enter both an IP address and a netmask in the same field, you can use the short form of the netmask. For example, 192.168.1.100/255.255.255.0 can also be entered as 192.168.1.100/24.

System Network Interface

DHCP

If you configure the interface to use DHCP, the FortiGate unit automatically

broadcasts a DHCP request. You can disable Connect to server if you are configuring the FortiGate unit offline and you do not want the FortiGate unit to send the DHCP request.

PPPoE

If you configure the interface to use PPPoE, the FortiGate unit automatically

broadcasts a PPPoE request. You can disable connect to server if you are configuring the FortiGate unit offline and you do not want the FortiGate unit to send the PPPoE request.

FortiGate units support many of the PPPoE RFC features (RFC 2516) including unnumbered IPs, initial discovery timeout that times and PPPoE Active Discovery Terminate (PADT).

Distance Enter the administrative distance for the default gateway retrieved from the DHCP server. The administrative distance, an integer from 1-255, 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. The default distance for the default gateway is 1.

Retrieve default gateway from server

Enable Retrieve default gateway from server to retrieve a default gateway IP address from the DHCP server. The default gateway is added to the static routing table.

Override internal DNSEnable Override internal DNS to use the DNS addresses retrieved from the DHCP server instead of the DNS server IP addresses on the DNS page.

Connect to server Enable Connect to Server so that the interface automatically attempts to connect to a DHCP server. Disable this option if you are configuring the interface offline.

Status Displays DHCP status messages as the FortiGate unit connects to the DHCP server and gets addressing information. Select Status to refresh the addressing mode status message.

initializing No activity.

connecting The interface is attempting to connect to the DHCP server.

connected The interface retrieves an IP address, netmask, and other settings from the DHCP server.

failed The interface was unable to retrieve an IP address and other information from the DHCP server.

Figure 13: PPPoE settings

User Name The PPPoE account user name.

Password The PPPoE account password.

Unnumbered IP Specify the IP address for the interface. If your ISP has assigned you a block of IP addresses, use one of them. Otherwise, this IP address can be the same as the IP address of another interface or can be any IP address.

Initial Disc Timeout

Initial discovery timeout. The time to wait before retrying to start a PPPoE discovery. Set Initial Disc to 0 to disable.

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. PADT must be supported by your ISP. Set initial PADT timeout to 0 to disable.

Distance Enter the administrative distance for the default gateway retrieved from the PPPoE server. The administrative distance, an integer from 1-255, 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. The default distance for the default gateway is 1.

Retrieve default gateway from server

Enable Retrieve default gateway from server to retrieve a default gateway IP address from a PPPoE server. The default gateway is added to the static routing table.

Override internal DNS

Enable Override internal DNS to replace the DNS server IP addresses on the DNS page with the DNS addresses retrieved from the PPPoE server.

Connect to serverEnable Connect to Server so that the interface automatically attempts to connect to a PPPoE server. Disable this option if you are configuring the interface offline.

Status Displays PPPoE status messages as the FortiGate unit connects to the PPPoE server and gets addressing information. Select Status to refresh the addressing mode status message.

initializing No activity.

connecting The interface is attempting to connect to the PPPoE server.

connected The interface retrieves an IP address, netmask, and other settings from the PPPoE server.

failed The interface was unable to retrieve an IP address and other information from the PPPoE server.

System Network Interface

DDNS

Enable or disable updates to a Dynamic DNS (DDNS) service. When the FortiGate unit has a static domain name and a dynamic public IP address, select DDNS Enable to force the unit to update the DDNS server each time the address changes. In turn, the DDNS service updates Internet DNS servers with the new IP address for the domain.

Dynamic DNS is available only in NAT/Route mode.