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DFL-500 User Manual
91
•
For the external interface, select Modify
.
• Select the management Access methods for the external interface.
HTTPS
To allow secure HTTPS connections to the web-based manager through the external interface.
PING
If you want the external interface to respond to pings. Use this setting to verify your installation and for
testing.
SSH
To allow secure SSH connections to the CLI through the external interface.
SNMP
To allow a remote SNMP manager to request SNMP information by connecting to the external interface.
See Configuring SNMP
.
Selecting HTTPS for the external interface allows remote administration of the DFL-500 NPG using
the web-based manager from any location on the Internet. Selecting SSH for the external interface
allows remote administration of the DFL-500 NPG using the CLI from any location on the Internet.
Selecting SNMP for the external interface allows remote SNMP management of the DFL-500 NPG
from the Internet.
•
Select OK.
You can control the IP addresses from which administrators can access the web-based manager. See Adding
and editing administrator accounts.
Changing the external interface MTU size to improve network performance
To improve the performance of your internet connection, you can adjust the maximum transmission unit (MTU)
of the packets that the DFL-500 NPG transmits from its external interface. Ideally, you want this MTU to be
the same as the smallest MTU of all the networks between the DFL-500 NPG and the Internet. If the packets
that the DFL-500 NPG sends are larger, they get broken up or fragmented, which slows down transmission
speeds.
Trial and error is the only sure way of finding the optimal MTU, but there are some guidelines that can help.
For example, the MTU of many PPP connections is 576, so if you connect to the Internet via PPP or PPPoE,
you might want to set the MTU size to 576. DSL modems also have small MTU sizes. Most ethernet networks
have an MTU of 1500.
If the external interface is configured using PPPoE, MTU may be negotiated by the PPPoE protocol. If this is
the case, the system may override manual MTU settings.
If you connect to your ISP using DHCP to obtain an IP address for the external interface, you cannot set the
MTU below 576 bytes due to DHCP communication standards.
To change the MTU size of the packets leaving the external interface:
•
Go to System > Network > Interface .
• For the external interface, select Modify
.
•
Select Fragment outgoing packets greater than MTU.
•
Set the MTU size.
Set the maximum packet size in the range of 68 to 1500 bytes. The default MTU size is 1500.
Experiment by lowering the MTU to find an MTU size for best network performance.