SMC Networks SMC2804WBR V.2 - Manual (Page 69)

Advanced Setup
67
The MAC Filtering feature of the Wireless Barricade™ allows
you to control access to your network for up to 32 clients based
on the MAC (Media Access Control) Address of the client machine.
This ID is unique to each network adapter. If the MAC address
is listed in the table, that client machine will have access to the
network.
URL Blocking
To configure the URL Blocking feature, use the table below to
specify the web sites (www.somesite.com) and/or keywords
you want to filter on your network.
To complete this configuration, you will need to create or modify
an access rule in "Access Control" on page 65. To modify an
existing rule, click the Edit option next to the rule you want
to modify. To create a new rule, click on the Add PC option.
From the Access Control Add PC section check the option
for "WWW with URL Blocking" in the Client PC Service table
to filter out the web sites and keywords specified below.
Use the above screen to block access to web sites or to web
URLs containing the keyword specified in the table.