Wake on Lan from Powered Off

Hi,
Is it possible to Wake on Lan from a powered off state?
I have a new iMac running Snow Leopard 10.6.5, with an ethernet cable attached.
Thanks.

No, the iMac will only "wake" from sleep.
Regards,
Captfred

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  • Wake on lan from power OFF

    It appears that Mac's don't provide wake on lan from complete power off. I have no problem powering up my Mac from sleep, but it won't turn on from power off (like every PC I've tried). This is not difficult to do, as every $200 PC on the market w/ WOL does it.
    I have my Mac on a large shared UPS with serveral other computers and network gear, etc.
    There is a linux server which actually communicates with the UPS. During a power failure, that linux box will connect to ever other machine on the network sharing this UPS and tell them to SHUT OFF, not sleep, because hard power failure is emminent. When all remote machines are off, the linux machine shuts off, and the UPS powers off it's outlets.
    On power recovery, the UPS waits until it's batteries are sufficiently recharged, and turns back on, powering up it's protected outlets. All the machines see power come back on, and are set to reboot.
    Here is the problem. If the power comes back on AFTER the remote machines are shut down, but before the linux box turns off, the linux box sees power recovery, and the UPS never shuts off it's protected outlets. Now all the remote machines are off, and won't ever see their power cut off, and then recover, so they don't turn back on.
    The PCs are easy... hit them with a wake-on-lan packet and they reboot from complete power off... but not the trusty Mac because Apple didn't implement that part of the wake-on-lan standard!
    So... I'm faced with abandoning wake on lan for all the machines and building an interface with a big relay to KILL power to all remote machines to power them back on. Isn't this more than just a little silly? Apple... why not just make your machine comply with the standard so that it plays nicely in a mixed environment!
    Providing wake on lan from sleep, and power on with power recovery, but no wake on lan from OFF is just ridiculous.
    I welcome any ideas...
    PowerMac G5 Dual 2.0   Mac OS X (10.4.8)  

    Malcolm,
    If I make it sleep, then I'm forcing it to crash when the power turns off. The idea here is for a graceful shutdown before emminent power failure when the UPS battery runs out.
    The only reason it's getting shut down is that the main power has failed and the UPS battery is running low.
    I agree that with no power they can't interpret packets and react... but that's why proper wake-on-lan implementations keep the NIC powered up to watch for WOL packets.
    Thanks,
    -Russ

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    I'm relatively new to Mac and don't have a lot of Mac experience or knowledge. Last week I completed the "Mac OS X Deployment v10.4" training in Sydney where the trainer told me that Wake-On-LAN will only work if the Mac in question is in sleep mode -i.e., you can't wake up a Mac that has been shut down. Is this really true?
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    I've already complained of Mac's variation from the "standard" WOL implementation. This problem goes a step deeper as I just discovered.
    If in the energy saver options you check the "Restart after a power failure event", the machine will do just that. If the power fails, and then comes back, the machine will boot.
    If however, you cleanly shut down the machine, and then power fails, it does not turn back on when the power recovers. All PC's that have auto-power on with AC power restored set in their bios don't care if the machine was cleanly shutdown or crashed... when power comes back, it boots.
    The problem here is that when a UPS detects a power failure and eventually decides to shut down the attached computer it should do so cleanly, not by just crashing it (that defeats the purpose of having a UPS!). After the computer turns off, the UPS will turn itself off, cutting power to the computer all together. When the AC power to the UPS returns, and the batteries charge sufficiently, it will turn BACK on, and restore power to the computers.
    As it stands now, I have no mechanism by which to force my Mac to boot back up! I could depend on a linux machine on the network (that does behave properly) to send a WOL packet, but it doesn't do that correctly either... so I'm SOL
    I can understand having 3 options for reboot after power restore. (1. Restore Always, 2. Restore when system on and power fails, 3. Never Restore).
    Only giving us options 2 and 3 is just an oversight of how computers are used in the real world. For the desktop user that may on rare occasion find his machine powered off, and just presses the power button, this is a non issue... But in my opinion this completely eliminates a Mac like this from being used as a webserver/mailserver or other application where uptime is paramount.
    I can't believe that Apple would overlook something so important and not provide a mechanism by which a UPS could turn a computer back on after a power recovery. Perhaps there is a non-published setting that doesn't have a check box on a form, that an OEM UPS driver would set that says "pretend you crashed".

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    No, the iMac will only "wake" from sleep.
    Regards,
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    "susehoush" wrote in message
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