Wake On Lan only works within a few minutes

Hi!
I have a problem...I left my MacPro sleeping for a few hours and now it will not respond to wake on lan...It does work to wake within a few minutes but not after a few hours.
Anyone have a solution for this? (I'n not using a router)

Found the problem!! A nice person on logmein forums helped me. Thought i should post the solution in case somebody runs into this issue. I was forwarding the local IP of my computer (192.168.2.2) to a port (say port 9). It seems a router remembers the local IP's for a few minutes after the mac goes to sleep and after that its ARP table (which links MAC address to IP address) gets deleted. This is why it works for the first few minutes and not after that.
So the local IP being forwarded should be the 'broadcast address' and not the local computer's LAN address. It seems for subnet mask 255.255.255.0 the broadcast for IP range 192.168.2.x takes place for x=255. So i changed the router settings to forward local IP 192.168.2.255 to port 9. And it started to work. Hopefully this should help anyone with the same issue.

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Thanks for using Apple Support Communities.
For more information on this, take a look at:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628?viewlocale=en_US
and
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http://support.apple.com/kb/HT1365
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Last edited by ayushjsh (2013-04-03 07:00:28)

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Wake On Lan only works within a few minutes

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