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Re: Remotely choose a menu entry

From: Andrei Borzenkov
Subject: Re: Remotely choose a menu entry
Date: Sat, 29 Nov 2014 19:03:29 +0300

В Sat, 29 Nov 2014 01:10:28 +0000
Brugnara Daniele <address@hidden> пишет:

> Hi all.
> I'm thinking about a system that boots with a wol packet. Who sends this
> packet in 99% of cases, is far away from that computer and it could be
> useful to boot into a different system instead of the default one. (please
> keep in mind that changing the default option in grub is not a option for
> this specific use case)
> If a wol can be delivered successfully, an UDP packet containing simple
> datas should be enough to achieve this.
> Something like this:
> - MAC: the destination device mac address
> - choice: a number (can be empty)
> - commandLine: a full commandline (a choice or this..)
> - more? I don't know for now..
> This option should be enabled in the grub.conf by the user.
> What do you think about? Could this be useful? Am I missing something, like
> a tool that does this automagically?

Yes, it could probably be implemented as a command that loops listening
for magic packet and then sets default menu option. Of course, you
would need to consider security aspects (who is allowed to send
packet, how it is authenticated etc). 

> I've read about an eth-to-serial but it's not what I want.
> PXE or bootp is not an option here. I don't want to manage another
> server...
> Thanks for your time.
> Daniele.

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