Fortinet Fortigate-5000 series - Configuring Dynamic DNS Service for an Interface

System Network Interface
FortiGate Version 3.0 MR4 Administration Guide
01-30004-0203-20070102 81
Configuring Dynamic DNS service for 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.
Go to System > Network > Interface. Select Create New or select the Edit icon
of an existing interface. Enable DDNS, just below the Addressing mode section,
and configure the DDNS service using the information they have provided to you.
Status Displays PPPoE or PPPoA status messages as the FortiGate unit
connects to the PPPoE or PPPoA server and gets addressing
information. Select Status to refresh the addressing mode status
message.
This is only displayed if you selected Edit.
Status can be one of the following 4 messages.
initializing No activity.
connecting The interface is attempting to connect to the PPPoE or PPPoA server.
connected The interface retrieves an IP address, netmask, and other settings
from the PPPoE server.
When the status is connected, PPPoE or PPPoA connection
information is displayed.
failed The interface was unable to retrieve an IP address and other
information from the PPPoE or PPPoA server.
Reconnect Select to reconnect to the PPPoE or PPPoA server.
This is only displayed if Status is connected.
User Name The PPPoE or PPPoA account user name.
Password The PPPoE or PPPoA 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 starting to retry a
PPPoE or PPPoA discovery. Set Initial Disc Timeout to 0 to disable.
Initial PADT
timeout
Initial PPPoE Active Discovery Terminate (PADT) timeout in seconds.
Use this timeout to shut down the PPPoE or PPPoA 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 or PPPoA 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 System DNS page with the DNS addresses retrieved from the
PPPoE or PPPoA server.
Connect to server Enable Connect to Server so that the interface automatically attempts
to connect to a PPPoE or PPPoA server when you select OK or Apply.
Disable this option if you are configuring the interface offline.