Originally Posted by Rascal
how do you do that?
You would block them at your firewall. You can do that on your PC if it has one, or you can at your wireless router depending upon it's configuration-options.
I can't tell every home user how to do this due to the all the different configuration options
But a simple design from the outside-in would be
---->Internet Connection ----->router/firewall------->internal home network. You would block them from an IP address perspective at the router/firewall. The router/firewall can be two separate devices. Shop around. Ask questions at your local store. Do some google searches. Then tell people you're a security guru.