[Netkit.users] Wake-On-LAN in Netkit

Massimo Rimondini rimondin at dia.uniroma3.it
Tue Oct 19 17:30:51 CEST 2010

Dear Adrian,

I confirm what you have said. Most likely, the only way would be to
write a kernel hack that brings the interface back up once a magic
packet is detected. But you would need the affected virtual machine to
be already running in order to detect the packet. Or, alternatively, you
could modify the uml_switch code to automatically bring up a virtual
machine once a specific magic packet mapped to that machine is intercepted.


On 10/19/2010 04:28 PM, Adrian van Dongen wrote:
> Hi Emanuele,
> I dont think that is possible because Wake-On-Lan (WOL) is a hardware
> based feature. Your motherboard/nic does the handling of the magic
> packet used for WOL, so there is no OS required. If you shut your nic
> in your virtual machine (netkit) you simply do not receive any
> packets. There is no hardware listening to handle the magic packet. In
> the case of WOL it actually doesn't do anything with the nic, the
> motherboard just receives the packet and returns itself from standy
> modus. As far as i know Netkit does not support something like standby
> modus (Correct me if i am wrong Massimo)
> Sources:
> http://en.wikipedia.org/wiki/Wake-on-LAN
> Regards,
> Adrian.
> On Tue, Oct 19, 2010 at 4:07 PM, Emanuele Colombo
> <lele.colombo86 a gmail.com <mailto:lele.colombo86 a gmail.com>> wrote:
>     Hi, I'm working with Netkit and I'm trying to make a fully
>     functional network in which interfaces or nodes can be shut down
>     in order to reduce power consumption. I'd like to know if is it
>     possible to use Wake-On-LAN. I need this function because I don't
>     know how to wake up a virtual machine from another one if I shut
>     down all its network interfaces. Thank you for your help,
>     Emanuele
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