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i have seen many WOL instances use port 7 and many use port 9, does it matter? Isn't it just looking for a WOL packet at layer 2 or ethernet?

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Nope, it doesn't matter. It doesn't even have to be a UDP or an IP packet at all. The NIC is just looking for the magic pattern (six bytes of 0xff, then its own MAC address 16 times) in all the frames it sees.

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"in all the frames it sees" --- so the 6x0xff + 16xMAC can be in a single frame? – rjt Jun 13 '11 at 22:42
@rjt Yes, the magic pattern can be in a single frame. In fact, it probably has to be. I doubt it would work if it was split between frames. – Spiff Jun 13 '11 at 22:52
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