Using sleepwatcher, add the following commands to your script to run when your computer is going to sleep: After much experimentation, I finally have a reliable way of defeating this check without really doing either of the above. This check is always made at the point the machine is about to go to sleep. if there are no Bonjour-advertised services on your system.If 'Wake for network access' is turned off.
#Wake on lan client for mac code#
The code in mDNSResponder makes only two checks on when not to schedule the maintenance wakes: we might wake up and find no wireless network because the base station got rebooted just at that moment, and if that happens we don't want to just give up and go back to sleep and never try again.So how do I turn off this auto-wake feature then? We still want to wake up in at most 120 minutes, to see if the network environment has changed. "A comment in mDNSResponder's open source code offers some explanation:
#Wake on lan client for mac mac#
To wake up a computer using WoL, you just need to send a "magic WoL packet" to the computer's Ethernet MAC address.Īnnoyingly, the Snow Leopard OS doesn't offer any way to enable WoL without enabling WoD. Wake on LAN is an open standard that predates Wake-on-Demand. if Internet connection sharing is enabled). An always-on Mac can also run the Bonjour Proxy service (e.g. I've already blogged about one side-effect of this here: Apple Time Capsule steals IP addresses, but that's OK really. Recent firmware for the Apple Time Capsule and Apple Airport Express wireless access points implement a Bonjour Proxy service. The Wake On Demand feature depends on a device on your network running a Bonjour Proxy Cache server. I don't like this: it's a waste of energy (the computer won't sleep again until the usual timer expires) it unnecessarily stresses the machine and it's annoying if someone's sleeping in the same room as the computer. Whilst the Wake On Demand feature is well-intentioned, it has an unwelcome side-effect: the sleeping computers wake up every two hours (day and night) to check the local network configuration and refresh the Bonjour proxy cache. Sensibly, laptops don't wake up with lid closed or without mains power. The Wake On Demand feature is enabled by ticking the box marked Wake for network access under System Preferences / Energy Saver. So for example, your iMac can save energy by sleeping, but it will wake up quickly if you need to copy a file over to your MacBook access an iTunes library or log in remotely via Remote Desktop or SSH. Wake On Demand allows computers to save energy by sleeping when idle, whilst waking up automatically if another machine on your network requests service. This is an open standard, intended to be a more user-friendly version of Wake On LAN (WoL) which has been around for years. This article discusses Wake-on-Demand versus "classic" Wake-on-LAN on Mac Snow Leopard.Īpple's Snow Leopard operating system introduced Wake On Demand (WoD).
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