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

[Emanuele Colombo]

I imagined that a kernel hack would be of use, but I'm new in Netkit and
this operation seems to be quite difficult.For example, which could be the
files to edit?

Regards,

Emanuele

2010/10/19 Massimo Rimondini <rimondin a dia.uniroma3.it>

>  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.
>
> Regards,
> Massimo.
>
>
> 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> 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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