FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
zeeshan_FTNT
Staff
Staff
Article Id 195837
Description
This article explains how to change the speed settings on an interface in order to get the maximum bandwidth on interface.

Solution
Some time speed settings on the public interface do not match with the ISP modem settings.  These settings can be manually adjusted by using the CLI only.

To check the current settings on the public interface
config system interface
edit wan1
get
If using Vdom:
config vdom
edit root   (where root is the selected vdom)
config system interface
edit wan1
get
To change the speed settings to the desired requirement
config system interface
edit wan1
set speed <interface_speed> (10full/10half/100full/100half/1000full/1000half)
end
The interface speed:

auto — the default speed. The interface uses auto negotiation to determine the connection speed.

Change the speed only if the interface is connected to a device that does not support auto-negotiation.
10full — 10 Mbps, full duplex
10half — 10 Mbps, half duplex
100full — 100 Mbps, full duplex
100half — 100 Mbps, half duplex
1000full — 1000 Mbps, full duplex
1000half — 1000 Mbps, half duplex

Speed options vary for different models and interfaces.  Enter a space and a “?” after the speed field to display a list of speeds available for the model and interface. The speed cannot be changed for switch interfaces.

Note that the XG2 interfaces on models FortiGate 3140B and  FortiGate 3950B cannot be configured for 1000Mbps.

If using Vdom:
config vdom
edit root   (where root is the selected vdom)
config system interface
edit wan1
set speed <interface_speed> (10full/10half/100full/100half/1000full/1000half)
end

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