Routers

This site contain instructions for setting up whole-house parental controls with Netgear routers. The technology uses a service called OpenDNS. Many organizations (like Blythefield) use OpenDNS as a way to provide protection and HR policy enforcement for company-owned computers.

Routers can also be setup to limit internet access:
Netgear
Linksys
Cisco
If you have a different brand, please let me know.