Re: IOKit Power Manager Help
Re: IOKit Power Manager Help
- Subject: Re: IOKit Power Manager Help
- From: Tom Sutcliffe <email@hidden>
- Date: Mon, 7 Jul 2003 01:01:33 +0100
On a side note, can anyone explain this "Magic Packet" that can be
sent over
the network to wake a machine up?
The magic packet is just a special chunk of data that the network card
listens for when the computer is asleep.
It is 6 bytes of FF followed by 16 repetitions of the 6 byte MAC
address.
It doesn't matter how you get this packet to the machine - generally I
do a broadcast of a UDP packet containing the above as its payload. The
reason for this is that once a machine has been asleep long enough the
arp lookup fails, so you can't really wake a machine that isn't on your
subnet.
Regards,
Tom
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