Wake on Lan works with Ethernet, not over Wi-Fi.

Hello, after several months of tests I came to this conclusion.
Wake on Lan only works with Ethernet for my iMac. Wake on Lan over Wi-Fi works for a few hours, but if the iMac is asleep for 6 hours or so, it becomes unavailable... On the other hand, with Ethernet it's always available even if it sleeps for an entire week.
My iMac isn't that old (mi-2011), so I guess it should handle Wake on Lan over Wi-Fi. Is it a software issue?
- I've got a MacBook Pro since Snow Leopard 10.6 and now with Mountain Lion it handles Wake on Lan over Wi-Fi without problem.
- I've got my iMac since Lion. Does the iMac only handle Wake on Lan with Ethernet and works differently compared to the MacBook Pro?
I prefer to use Wake on Lan over Wi-Fi because for the tests I've placed my iMac in the living room in order to plug it to the Time Capsule, but the right place for my iMac is in my bedroom.
I tried to change the MTU size as it is described here: http://osxdaily.com/2012/08/02/fix-os-x-mountain-lion-wireless-connection-proble ms/
Note that "Wake on Lan" is checked in my System Preferences, I don't think it's my router's fault, because my Apple TV, AirPort Express, iPhone 5, iPad 2 and my Printer don't disconnect even when they're asleep (I'm talking about my printer and Apple TV in that case).

loïcfernandezcastrillon wrote:
I'm connected with the WiFi of my Time Capsule (bridge mode). I have this configuration since Snow Leopard, and no troubles...
I understand that, but if your router is not an Apple AirPort Base Station then it introduces an element of uncertainty. Apple has implemented many changes related to wireless networking recently.
You are complicating matters by changing networkoversleep:
networkoversleep - this setting affects how OS X networking presents shared network services during system sleep. This setting is not used by all platforms; changing its value is unsupported.
Solving problems like this requires that you simplify your network environment and eliminate its unknowns. Using third party routers and making unsupported changes runs counter to simplification.
The iMac stays connected to the Time Capsule about 6 hours during sleep. Then it dissapears...
The iMac wakes periodically (every few hours) to inform your router of its network presence for Wake on LAN demands. Try changing your router's DHCP lease period to something longer than a few hours. For a home environment, a few days is more appropriate. This may not solve the problem, but it is better than making unsupported changes to your system.

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