How to Disconnect Internet Connectionsby Marie Cartwright ; Updated September 28, 2017
Whether you are troubleshooting your connection, or simply want to get some work done without distractions, sometimes it's necessary to turn off the Internet for a while. If you are using a computer at home, this can be done as easily as turning off your router, or unplugging the network cable. However, if you need a computer to remain disconnected, or if you are using public wireless, here are the basic steps to get your computer offline.
Disconnect PC Internet Connections
Click on the "Start" button in the lower-left corner of your computer screen to open your Start Menu. Click on the "Control Panel" icon.
Open your network connections. If you are using Windows XP, click the icon labeled "Network and Internet Connections." Click on the "Network Connections" icon. If you are using Windows 7, find the menu listing entitled "Network and Internet." Then click "Network and Sharing Center."
Right-click on the Internet connection you wish to disconnect. This will open a drop-down menu with many options. Click on "Disable."
Disconnect Mac Internet Connections
Open the Apple Menu. Click "System Preferences."
Click "Network." Select the connection you wish to disable, either "Ethernet" or "Airport." This will open the IPv4 pop-up menu.
Change the IPv4 setting to "Manually."