If you need to wake your Mac, you usually will simply go to it and tap the keyboard or click the mouse; however, there may be times when the Mac may be out of reach, such as if it's a server in a locked closet. Granted, as a server you might not want to set the system to go to sleep, but there may be similar instances where a system is inaccessible and you need to wake it up.
Waking a system via the network uses a technology called Wake on LAN, which can be configured in your Mac's system preferences. This allows your system to be woken from sleep or standby modes by a special network datagram called a magic packet. In general, this is done to wake one Mac with another on the same network; however, you can also use it for any device that can send a magic packet, including your iPhone.
To use this, you will first need to know some information about your Mac, and ensure it is set up to be woken through the network. This information includes your Mac's physical MAC address, and optionally the IP address of the system:
- Set the Mac to Wake on LAN by checking the "Wake For Network (or Ethernet/Wi-Fi) Access" in the Energy Saver pane in System Preferences.
- Look up your Mac's physical MAC address in the Network system preferences, and also note its IP address.
Waking it up
- Get a Wake on LAN app for your iPhone, some of which are WakeIP, Mocha WOL (free), and iNet WOL.
- Launch the App and enter your Mac's MAC address and IP address in the program's configuration.
- Tap the option to wake your Mac in the program, and it should wake up.
Note that this process will require your Mac to be on the same network as your iPhone, so this cannot be done over the Internet. If the process does not work, then double-check that you have the right MAC address for your Mac's active network port. You can also try resetting your router, and checking its settings to ensure Wake On LAN features are allowed (sometimes there may be settings that block this).