Note: You can use the same method to share an Internet connection on another interface-for example, you could share a Wi-Fi connection over Thunderbolt-but I cover only Ethernet-to-Wi-Fi here because it’s the most common scenario. Your Mac’s Internet connection is now shared via Wi-Fi.

Select the checkbox next to Internet Sharing on the left.

Click Wi-Fi Options, choose a network name and channel (or just keep the defaults), choose WPA2 Personal from the Security pop-up menu, and enter (and confirm) a password.

② Share an Ethernet connection over Wi-Fi.

In the To Computers Using box, select the Wi-Fi checkbox ②.

On the right, from the Share Your Connection From pop-up menu, choose Ethernet (or whichever other hard-wired connection your Mac uses for Internet access).

① Select Internet Sharing to start-but you can’t check the box (yet). (You can’t select the checkbox itself until you’ve completed a few more steps.)

Select Internet Sharing in the list on the left ①.

The range and throughput of your Mac-created Wi-Fi network won’t be as good as what you would get from a stand-alone Wi-Fi router, such as an AirPort Express.

But if you happen to have an Internet connection through another hardware port (a Thunderbolt or FireWire port, for example, or a USB-to-Ethernet adapter), it can share that connection.

Your Mac can’t re-share an existing Wi-Fi connection.

However, note the following qualifications: In other words, it acts as a software base station. If your Mac connects to the Internet via an Ethernet cable, it can create its own Wi-Fi hotspot to share that connection with another Mac, an iOS device, or any other device with Wi-Fi.

Broadcast an iTunes Library in Your Home.Broadcast and Share Games and Game Stats.

Broadcast Browser Tabs to Other Devices.Share iPhone Calls and Texts across Devices.Share Your iOS Device’s Internet Connection.Sync Calendars and Reminders with Others.Sync Calendars and Reminders across Devices.

Use mac ethernet for file transfer