How to set up your FortiWAN Configuring Network Interface (Network Setting)
Up/Down Stream Threshold : Specify upstream/downstream (Kbps) threshold for the WAN link. WAN link
with traffic that exceeds the threshold values will be considered as failed.
FortiWAN’s Auto Routing and Multihoming (See "Outbound Load Balancing
and Failover (Auto Routing)" and "Inbound Load Balancing and Failover (Multi-
homing)") use the value while balancing traffic between WAN links if the
Threshold function is enabled. Leave it blank or zero if you do not apply
threshold to the WAN link.
MTU : (Maximum Transmission unit) refers to the size of the largest packet or frame
that a given layer of a communications protocol can pass onwards. It allows
dividing the packet into pieces, each small enough to pass over a single link.
IPv4 Localhost IP :
The IPv4 address that ISP provides (See "Scenarios to deploy subnets"). IP
addresses specified here can be used for NAT to transfer the source IP
address of packets to, and will be used to generate the NAT default rules of
the WAN link (See "NAT").
IPv4 Netmask : The IPv4 netmask that ISP provides.
IPv4 Gateway : The IPv4 address of the default gateway.
IPv6 Localhost IP :
The IPv6 address that ISP provides (See "Scenarios to deploy subnets"). IP
addresses specified here can be used for NAT to transfer the source IP
address of packets to, and will be used to generate the NAT default rules of
the WAN link. For FortiWAN V4.0.x, system does not generate NAT
default rules for IPv6 WAN links, setting NAT rules manually is
required (See "NAT").
IPv6 Prefix : The IPv6 prefix that ISP provides.
IPv6 Gateway : The IPv6 address of the default gateway.
See also
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WAN link and WAN port
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VLAN and port mapping
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Configurations for VLAN and Port Mapping
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Outbound Load Balancing and Failover (Auto Routing)
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Inbound Load Balancing and Failover (Multihoming)
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Scenarios to deploy subnets
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IPv6/IPv4 Dual Stack
Configurations for a WAN link in Brideg Mode: PPPoE
[Bridge Mode: PPPoE] is used for PPPoE WAN link (ISP provides dynamic or static IP addresses via PPPoE). In [Basic
Settings], you shall configure upstream and downstream, user name, password and service name given by ISP. Left
[IP Address] blank if you are assigned an dynamic IP address; otherwise, enter your static IP address. Select an
FortiWAN WAN port to which PPPoE ADSL Modem is connected, e.g. port1. Checks [Redial Enable] to enable redial.
As some ISPs automatically reconnect to the network within a certain time interval, [Redial Enable] will avoid
74 FortiWAN Handbook
Fortinet Technologies Inc.
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