Help! I have a 3 computer LAN at home connected through a router to my ISP. Printer and file sharing is used. I believe I am secure from attacks originating on the other side of the router, but want security from attacks originating within the LAN. For example, what if someone opens an email or similar with the LAN and infects their computer. How do I protect the other computers? I tried Windows built-in firewall but that blocked sharing.
Thanks.
Thanks.