D-Link DSL-4320L User Manual page 122

Section 4 - Configuration
SSH / Telnet /
If you want to allow router setup via the SSH, telnet, or TFTP protocols,
TFTP: you can configure it here.
For each protocol, click Enable Local Management to allow
administrators to configure the network from within, and/or Enable
Remote Management to allow administrators to configure the
network from outside.
If you enabled remote management, enter the remote port number
that the router will use for that protocol.
Click Save when you are done.
To load, save, or reset settings, or reboot the router, click Save.
D-Link DSL-4320L User Manual 118