D-Link DFL-600 - Manual (Page 67)

Remember to save the Policy configuration into the DFL-600’s non-volatile
RAM using the Save button (under the Tools tab, click the System button to
see the Save options). This will ensure that the DFL-600 will retain the
Policy configurations when it is restarted or if the AC power is interupted.
Example 2 − Limiting Access to Internet Domains
Policy Rules
The DFL-600 allows you to specify rules that it will use to limit access (filter
packets) to and from PCs on your LAN. A policy rule on the DFL-600
establishes what information packets must contain before an action is taken
by the router. The action taken when a packet is read by the DFL-600 is
specified on the subsequent web pages, described below. To configure a
policy rule, click on the Policy button to open the Policy Rules page, as
shown below.