D-Link DI-713P - Manual (Page 49)

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proper firewall protection.
Remote Administrator Host
In general, only you, or members of your network, should access the
web configuration interface of the Broadband Router. In some
circumstances though, you may want to have access to the Broadband
Router web interface to change settings while you are away from your
network. The Remote Administrator Host field allows you to input the IP
address of one remote computer so that it can access the web configuration
interface to perform administrative tasks. Note: If you specify an IP
address of 0.0.0.0 and enable Remote Administration, any computer can
connect to the Broadband Router from outside of your network. Also,
when this feature is enabled, the web port will be shifted to port 88. This is
a security precaution to prevent an indiscriminate port scan, which could
find the web configuration interface and hack into your connection. In
order for the remote administrator to access the web configuration interface,
the user must input the IP address that has been given to the WAN port of
the Broadband Router (found in the Device Information screen). For
example: HTTP://192.168.51.23:88
Non-Standard FTP Port
Some FTP servers use a different port number than the standard port
21. This field will allow you to specify a non-standard FTP port number for
compatibility with those FTP servers.
After you have configured the Miscellaneous Items settings, click the
Save button. The following screen will be shown telling you that the
settings have been saved, but some items may not take effect until the
Broadband Router is rebooted.