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i have a problem since the guys from UPC changed my old cable modem with a new CISCO EPC 3208 model. (It's a VOIP cable modem & i have static IP from UPC/my ISP.) Since then, WOL over the internet works, but only for a few moments after i’ve shutdown the PC i’m trying to wake. (My PC connects directly to this CISCO modem, i have no router between.) I know how to set up a "WOL over internet" environment (BIOS, network card settings, etc. - i use Wake On Lan Monitor when PC is "alive" to be sure my PC gets the Magic Packets from internet) - but if i shutdown my PC and wait few minutes, i can't wake up my PC anymore. What would be the problem, any tips? Thanks!

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How are you sending your WOL packet? It kinda sounds like some device may not be forwarding the packet, because of timeout of some sort? Perhaps ARP? – Zoredache Mar 9 '12 at 18:43
It seems like the CISCO modem after 2-3 minutes "forget" the connection to my PC's network card. – zetlorf Mar 9 '12 at 20:24
[Edited] I'm sending the WOL packets from my phone (i have a different 3G connection to access the internet), and it works right after i shutdown my PC (the PC wakes up). But after 3-4 minutes, it seems like the CISCO modem "forgets" the connection to my PC's network card. I don't know hot to access my CISCO modem's ARP... I even called my ISP (UPC Romania) to ask them about that issue, but they told me that WOL over internet should work... (Before this Cisco modem i had a Cisco modem+router from the same ISP, and when i set it in bridge mode, the WOL over internet has worked...) – zetlorf Mar 9 '12 at 20:33
Aren't the WOL packets sent as UDP packets to the network's broadcast address? I'm using this in a perl script to wakeup some PCs. – ott-- Mar 9 '12 at 20:41
The Magic Packets are sent from my android phone with special WOL-programs (ex. Depicus), but they "hit" my PC only right after the PC-shutdown. – zetlorf Mar 9 '12 at 21:26

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