Fortinet fortigate-100a Benutzerhandbuch

To improve network performance, you can change the maximum transmission unit 
(MTU) of the packets that the FortiGate unit transmits from any interface. Ideally, this 
MTU should be the same as the smallest MTU of all the networks between the 
FortiGate unit and the destination of the packets. If the packets that the FortiGate unit 
sends are larger, they are broken up or fragmented, which slows down transmission. 
Experiment by lowering the MTU to find an MTU size for best network performance.

To change the MTU, select Override default MTU value (1500) and enter the 
maximum packet size. For manual and DHCP addressing mode the MTU size can be 
from 576 to 1500 bytes. For PPPoE addressing mode the MTU size can be from 576 
to 1492 bytes.

Select Log to record logs for any traffic to or from the interface. To record logs you 
must also enable traffic log for a logging location and set the logging severity level to 
Notification or lower. Go to Log & Report > Log Config to configure logging locations 
and types. For information about logging see 

Use the following procedures to configure FortiGate interfaces and VLAN 
subinterfaces.

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To allow SSH connections to the CLI through this interface.

To allow a remote SNMP manager to request SNMP information by connecting to 

this interface. See 

To allow Telnet connections to the CLI through this interface. Telnet connections 

are not secure and can be intercepted by a third party.

Note: In Transparent mode, if you change the MTU of an interface, you must change the MTU 
of all interfaces to match the new MTU.