Interfaces System Network
FortiGate Version 4.0 Administration Guide
132 01-400-89802-20090424
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Configuring Dynamic DNS on an interface
When the FortiGate unit has a static domain name and a dynamic public IP address, you
can use a DDNS service to update Internet DNS servers when the IP address for the
domain changes.
Dynamic DNS is available only in NAT/Route mode.
To configure DDNS on an interface
1 Get the DDNS configuration information from your DDNS service.
2 Go to System > Network > Interface.
3 Select Create New.
4 Enable DDNS.
5 Enter DDNS configuration information.
If at any time your Fortigate unit cannot contact the DDNS server, it will retry three times at
one minute intervals and then change to retrying at three minute intervals. This is to
prevent flooding the DDNS server.
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.
When the status is connected, PPPoE connection information is displayed.
failed The interface was unable to retrieve an IP address and other information from
the PPPoE server.
Reconnect Select to reconnect to the PPPoE server.
Only displayed if Status is connected.
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 Enter Initial discovery timeout. Enter the time to wait before starting to retry a
PPPoE discovery.
Initial PADT timeout Enter 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 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 to replace the DNS server IP addresses on the System DNS page
with the DNS addresses retrieved from the PPPoE server.
When VDOMs are enabled, you can override the internal DNS only on the
management VDOM.
Connect to server Enable Connect to Server so that the interface automatically attempts to
connect to a PPPoE server when you select OK or Apply. Disable this option
if you are configuring the interface offline.
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