g1smd - 5:46 pm on Dec 3, 2009 (gmt 0)
You computer already silently uses the services of a DNS server at your ISP when you browse the web. In your router you likely have "get settings automatically" selected. This new service is an alternative DNS service that you could use. To use it, you manually edit the router configuration to use the specified IP addresses instead of the "automatic" settings.