Sometimes You Wanna Keep Your Network Connection, But You Need to Block The Connection to Internet ... Here are Some Professional and Slow Ways to Do it ... Set the Gateway IP to Your IP Set the Firewall Rule to Block All Connections But Sometimes You Wanna Close Just Specific Ports Like "HTTP(80)". To Process it, You Can Configure Your Security Module or Firewall to Stop Ports You Choose. But There are Some Problems : Some Modules Don't Have This OptionIt's Too Slow to Do it If You Know The Way, Continue The Discussion ...