D-Link DFL-1000 [141/168] Changing the external interface mtu size to improve network performance

D-Link DFL-1000 [141/168] Changing the external interface mtu size to improve network performance
DFL-1000 User Manual
141
Enter your PPPoE account User name and Password.
Select OK.
The DFL-1000 NPG attempts to contact the PPPoE server to set the external IP address, netmask,
and default gateway IP address. When the DFL-1000 NPG gets this information from the PPPoE
server, the new addresses and netmask are displayed in the external IP address and netmask fields.
If the PPPoE connection with your ISP is dropped, the DFL-1000 NPG automatically attempts to re-
establish the connection.
Select Enable Connect to PPPoE server if you want the DFL-1000 NPG to automatically connect to a
PPPoE server when it starts up.
Controlling management access to the external interface
Use the following procedure to control management access to the DFL-1000 NPG through the external
interface. You can configure the DFL-1000 NPG so that you can access the web-based manager and CLI
by connecting to the external interface. You can also control whether a remote SNMP manager can
connect to the external interface to download management information from the DFL-1000 NPG.
Go to System > Network > Interface .
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-1000 NPG using
the web-based manager from any location on the Internet. Selecting SSH for the external interface
allows remote administration of the DFL-1000 NPG using the CLI from any location on the Internet.
Selecting SNMP for the external interface allows remote SNMP management of the DFL-1000 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-1000 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-1000 NPG and the
Internet. If the packets that the DFL-1000 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 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.

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