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RIP configuration
Configuring RIP for FortiGate interfaces
You can create a unique RIP configuration for each FortiGate interface. This allows
you to customize RIP for the network to which each interface is connected. For
example:
• If you have a complex internal network containing devices that use the RIP2
protocol, you might want to configure RIP2 send and receive for the internal
interface.
• If the external interface is connected to the Internet you may not want to enable
RIP send for this interface so that the internal routes are not exposed to the
Internet. However, you may want to configure RIP receive so that the FortiGate
unit receives routes from your ISP.
• If the DMZ interface is connected to a small DMZ network you may not need to
configure RIP for this interface.
To configure RIP for FortiGate interfaces
1 Go to System > RIP > Interface.
On this page you can view a summary of the RIP settings for each FortiGate interface.
2 Select Modify for the interface for which to configure RIP settings.
3 Configure the following RIP settings:
RIP1 Send This interface can send RIP1 routing broadcasts to routers on its network.
The routing broadcasts are UDP packets with a destination port of 520.
RIP1 Receive This interface can receive RIP1 routing broadcasts. The interface listens on
port 520 for broadcast RIP1 messages.
RIP2 Send This interface can send RIP2 routing broadcasts to its network. The routing
broadcasts are UDP packets with a destination port of 520.
RIP2 Receive This interface can receive RIP2 routing broadcasts. The interface listens on
port 520 for broadcast RIP2 messages.
Split-Horizon Configure split-horizon to prevent routing loops. By default, split horizon is
enabled. This option should only be disabled if you are sure that routing
loops cannot be created from this interface.
Authentication Enable authentication for RIP2 packets sent and received by this interface.
Authentication is only supported by RIP2. Do not select authentication if you
are configuring the interface for RIP1.
Password Enter the password to be included in RIP2 requests. The password can be
up to 16 characters long.
Mode Defines how the FortiGate authenticates RIP2 packets. Select None, Clear,
or MD5.
None means do not send the password.
Clear means send the password is plain text.
MD5 means use MD5 authentication.
Metric Changes the metric for routes sent by this interface. All routes sent from this
interface will have this metric added to their current metric value. You can
change interface metrics to give higher priorities to some interfaces. For
example, if you have two interfaces that can be used to route packets to the
same destination, if you set the metric of one interface higher than the other,
the routes to the interface with the lower metric will seem to have a lower
cost, so more traffic will use routes to the interface with the lower metric. The
metric can be from 1 to 16.