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Sharing Internet over an Ethernet Cable

Posted on by Jono Cooper

A few days ago, the phone jack for the modem stopped working and I had to move it to another part of the house. However our desktop doesn’t have a wireless card so I dug out an old netbook with an Ethernet jack to use as a temporary solution.

Start by connecting to the wireless network on the computer and using an ethernet cable to connect both devices. The device requiring a network connection won’t require any special configuration besides using DHCP but there’s a few easy steps required for the other.


  1. Open the Network and Sharing Center and click on Change Adapter Setting in the sidebar.
  2. Right click on Local Area Connection and select Properties LAN Properties
  3. Select Internet Protocol Version 4 (TCP/IPv4) and select Properties.
  4. Select Use the following IP Address and use something such as Use as the subnet and leave the rest blank.
  5. When you’re back at the network connections window, right click the Wireless Network Connection and select Properties. Wireless LAN Properties
  6. Switch to the Sharing tab and tick Allow other network users to connect through this computers internet connection. Select Local Area Connection as the adapter.
  7. Hit ok, close and you’re done!


  1. Open System Preferences → Sharing.
  2. Select Internet Sharing and choose the interfaces you would like to share on (My Mac does not have an Ethernet jack). Internet Sharing Mac
  3. Tick the checkbox and you’re done!


  1. Click the wireless icon and select Edit Connections in the dropdown.
  2. Select your Ethernet interface and click Edit. Connections Window
  3. Head over to the IPv4 Settings tab and change the method to Shared to other computers. Ethernet Options Dialog
  4. Hit save and you’re done!

The only problem with these methods are that the device requiring Internet won’t appear on the network which will make services such as file and printer sharing unavailable. I can’t imagine that this would be would be particularly good for your power bill either. Besides these minor drawbacks, this is an easy and quick way to share an Internet connection.