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> Chapter 21 - Networking > Interfaces > Interface settings

Interface settings

In Network > Interface, you configure the interfaces, physical and virtual, for the FortiGate unit. There are different options for configuring interfaces when the FortiGate unit is in NAT mode or transparent mode. On FortiOS Carrier, you can also enable the Gi gatekeeper on each interface for anti-overbilling.

Interface page
Create New Select to add a new interface, zone or, in transparent mode, port pair.

Depending on the model you can add a VLAN interface, a loopback interface, a IEEE 802.3ad aggregated interface, or a redundant interface.

When VDOMs are enabled, you can also add Inter-VDOM links.
Name The names of the physical interfaces on your FortiGate unit. This includes any alias names that have been configured.

When you combine several interfaces into an aggregate or redundant interface, only the aggregate or redundant interface is listed, not the component interfaces.

If you have added VLAN interfaces, they also appear in the name list, below the physical or aggregated interface to which they have been added.

If you have added loopback interfaces, they also appear in the interface list, below the physical interface to which they have been added. If you have software switch interfaces configured, you will be able to view them.
If your FortiGate unit supports AMC modules, the interfaces are named amc-sw1/1, amc-dw1/2, and so on.
Type The configuration type for the interface.
IP/Netmask The current IP address and netmask of the interface.

In VDOM, when VDOMs are not all in NAT or transparent mode some values may not be available for display and will be displayed as “-”.
Access The administrative access configuration for the interface.
Administrative Status Indicates if the interface can be accessed for administrative purposes. If the administrative status is a green arrow, and administrator could connect to the interface using the configured access.

If the administrative status is a red arrow, the interface is administratively down and cannot be accessed for administrative purposes.
Link Status The status of the interface physical connection. Link status can be either up (green arrow) or down (red arrow). If link status is up the interface is connected to the network and accepting traffic. If link status is down the interface is not connected to the network or there is a problem with the connection. You cannot change link status from the web-based manager, and typically is indicative of an ethernet cable plugged into the interface.

Link status is only displayed for physical interfaces.
MAC The MAC address of the interface.
Mode Shows the addressing mode of the interface. The addressing mode can be manual, DHCP, or PPPoE.
Secondary IP Displays the secondary IP addresses added to the interface.
MTU The maximum number of bytes per transmission unit (MTU) for the interface.
Virtual Domain The virtual domain to which the interface belongs. This column is visible when VDOM configuration is enabled.
VLAN ID The configured VLAN ID for VLAN subinterfaces.

Interface configuration and settings

To configure an interface, go to Network > Interfaceand select Create New.

Name Enter a name of the interface. Physical interface names cannot be changed.
Alias Enter an alternate name for a physical interface on the FortiGate unit. This field appears when editing an existing physical interface.

The alias can be a maximum of 25 characters. The alias name will not appears in logs.
Link Status Indicates whether the interface is connected to a network (link status is Up) or not (link status is Down). This field appears when editing an existing physical interface.
Type Select the type of interface that you want to add.

On some models you can set Type to 802.3ad Aggregate or Redundant Interface.
Interface Displayed when Type is set to VLAN.

Select the name of the physical interface to which to add a VLAN interface. Once created, the VLAN interface is listed below its physical interface in the Interface list.

You cannot change the physical interface of a VLAN interface except when adding a new VLAN interface.
VLAN ID Displayed when Type is set to VLAN.

Enter the VLAN ID. You cannot change the VLAN ID except when adding a new VLAN interface.

The VLAN ID can be any number between 1 and 4094 and must match the VLAN ID added by the IEEE 802.1Q-compliant router or switch connected to the VLAN subinterface.
Virtual Domain Select the virtual domain to add the interface to.

Admin accounts with super_admin profile can change the Virtual Domain.
Physical Interface Members This section has two different forms depending on the interface type:

•   Software switch interface - this section is a display-only field showing the interfaces that belong to the software switch virtual interface.
•   802.3ad aggregate or Redundant interface - this section includes available interface and selected interface lists to enable adding or removing interfaces from the interface.

Select interfaces from this Available Interfaces list and select the right arrow to add an interface to the Selected Interface list.
Addressing mode Select the addressing mode for the interface.

•   Select Manual and add an IP/Netmask for the interface. If IPv6 configuration is enabled you can add both a IPv4 and an IPv6 IP address.
•   Select DHCP to get the interface IP address and other network settings from a DHCP server.
•   Select PPPoE to get the interface IP address and other network settings from a PPPoE server.
•   Select One-Arm Sniffer to enable the interface as a means to detect possible traffic threats. This option is available on physical ports not configured for the primary Internet connection.
•   Select Dedicate to FortiAP/FortiSwitch to have a FortiAP unit or FortiSwitch unit connect exclusively to the interface. This option is only available when editing a physical interface, and it has a static IP address. When you enter the IP address, the FortiGate unit automatically creates a DHCP server using the subnet entered. This option is not available on the ADSL interface.

The FortiSwitch option is currently only available on the FortiGate-100D.
IP/Netmask If Addressing Mode is set to Manual, enter an IPv4 address/subnet mask for the interface. FortiGate interfaces cannot have IP addresses on the same subnet.
IPv6 Address If Addressing Mode is set to Manual and IPv6 support is enabled, enter an IPv6 address/subnet mask for the interface. A single interface can have both an IPv4 and IPv6 address or just one or the other.
Administrative Access Select the types of administrative access permitted for IPv4 connections to this interface.
  HTTPS Allow secure HTTPS connections to the web‑based manager through this interface. If configured, this option will enable automatically when selecting the HTTP option.
  PING Interface responds to pings. Use this setting to verify your installation and for testing.
  HTTP Allow HTTP connections to the web‑based manager through this interface. If configured, this option will also enable the HTTPS option.
  SSH Allow SSH connections to the CLI through this interface.
  SNMP Allow a remote SNMP manager to request SNMP information by connecting to this interface.
  FMG-Access Allow FortiManager authorization automatically during the communication exchange between the FortiManager and FortiGate units.
  CAPWAP Allows the FortiGate unit’s wireless controller to manage a wireless access point, such as a FortiAP unit.
IPv6 Administrative Access Select the types of administrative access permitted for IPv6 connections to this interface. These types are the same as for Administrative Access.
Security Mode Select a captive portal for the interface. When selected, you can define the portal message and look that the user sees when logging into the interface. You can also define one or more user groups that have access to the interface.
DHCP Server Select to enable a DHCP server for the interface. For more information on configuring a DHCP server on the interface, see DHCP servers and relays.
Device Detection Select to enable the interface to be used with BYOD hardware such as iPhones. Define the device definitions by going to User & Device > Device Inventory.
Enable Explicit Web Proxy Available when enabling explicit proxy on the System Information Dashboard (System > Dashboard > Status).

This option is not available for a VLAN interface selection. Select to enable explicit web proxying on this interface. When enabled, this interface will be displayed on System > Network > Explicit Proxy under Listen on Interfaces and web traffic on this interface will be proxied according to the Web Proxy settings.
Secondary IP Address Add additional IPv4 addresses to this interface. Select the Expand Arrow to expand or hide the section.
Comments Enter a description up to 63 characters to describe the interface.
Gi Gatekeeper (FortiOS Carrier only) For FortiOS Carrier, enable Gi Gatekeeper to enable the Gi firewall as part of the anti-overbilling configuration. You must also configure Gi Gatekeeper Settings by going to System > Admin > Settings.