System Network Interface
FortiGate Version 3.0 MR4 Administration Guide
01-30004-0203-20070102 75
Figure 28: Settings for an ADSL interface
Creating an 802.3ad aggregate interface
You can aggregate (combine) two or more physical interfaces to increase
bandwidth and provide some link redundancy. This has the benefit of higher
bandwidth but has more potential points of failure than redundant interfaces. The
interfaces must connect to the same next-hop routing destination.
FortiGate firmware on models 800 and higher implements
IEEE standard 802.3ad
for link aggregation.
An interface is available for aggregation only if
• it is a physical interface, not a VLAN interface
• it is not already part of an aggregated or redundant interface
• it is in the same VDOM as the aggregated interface
• it has no defined IP address and is not configured for DHCP or PPPoE
• it has no DHCP server or relay configured on it
• it does not have any VLAN subinterfaces
• it is not referenced in any firewall policy, VIP, IP Pool or multicast policy
• it is not an HA heartbeat interface
• it is not one of the FortiGate 5000 series backplane interfaces
When an interface is included in an aggregate interface, it is not listed on the
System > Network > Interface page. It is no longer individually configurable and
is not available for inclusion in firewall policies, VIPs, IP pools or routing.
Address mode Select the addressing mode that your ISP specifies.
IPOA IP over ATM. Enter the IP address and netmask that your
ISP provides.
EOA Ethernet over ATM, also known as Bridged mode. Enter
the IP address and netmask that your ISP provides.
DHCP See
“Configuring DHCP on an interface” on page 78.
PPPoE See “Configuring an interface for PPPoE or PPPoA”
on page 80.
PPPoA See “Configuring an interface for PPPoE or PPPoA”
on page 80.
Gateway Enter the default gateway.
Connect to Server Enable Connect to Server so that the interface
automatically attempts to connect. Disable this option if
you are configuring the interface offline.
Virtual Circuit Identification Enter the VPI and VCI values your ISP provides.
MUX Type Select the MUX type: LLC Encap or VC Encap.
Your ISP must provide this information.