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https://issues.apache.org/jira/browse/GUACAMOLE-513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17136055#comment-17136055
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Jerome Charaoui commented on GUACAMOLE-513:
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[~vnick] I just saw your PR merged into 1.2.0, congrats! I'm also excited to
see this feature integrated into Guacamole.
One thing I've noticed from reading the code is that if `wol_send_packet` is
enabled, then Guacamole will send the packet regardless of whether the host is
powered on or not. It would be great if it was possible to tweak this so that
an ICMP packet is first sent to check the status of the machine, and skip the
WoL packet (and subsequent delay) if the machine is already responding on the
network. That same ICMP facility could then be used to monitor the machine's
state after sending the packet, so that a connection might be established as
soon as (or some seconds after) an ICMP reply is received from the host,
instead of waiting an arbitrary number of seconds.
> Wake on LAN integration
> -----------------------
>
> Key: GUACAMOLE-513
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-513
> Project: Guacamole
> Issue Type: New Feature
> Reporter: Matt Blecha
> Assignee: Nick Couchman
> Priority: Minor
> Fix For: 1.2.0
>
>
> I'm beating this horse back to life from the old issue tracker as I do
> believe this is a rather important feature.
> I know it was stated a day or two ago in the old issue tracker that there was
> better justification necessary for this to be considered. Seeing as this
> appears to be supported by both Microsoft in their RD Gateway and in Citrix's
> gateway products since ~2014, there appears to be a fairly reasonable
> justification for such a feature already in the business community, as well
> as demand (seeing as Citrix made a fairly prominent announcement about it.)
>
> ===Begin TL;DR===
>
> We love Guacamole in terms of performance (even when most of our users opted
> to go the VNC route, despite having the RDP option made available to them),
> mobile device operation, ease of use and administration and the pure
> brain-dead simplicity of implementation and integration. (Thanks to the
> developer who wrote that installation script, we were zero to deployed and
> operating in less than 15 minutes, VM server spin-up included!)
> That being said, we may be forced to abandon the whole infrastructure on
> nearly 500 devices (and growing fast) in favor of a solution that is not as
> efficient, yet provides one feature that we dearly need.
> From my research (not as a coder, but serious DevOps experience) it's
> relatively trivial to craft and broadcast a magic packet in Java (A GitHub
> search yields several project with examples averaging about ~75 LOC,
> including sanity checking.) Adding in a sort of "timeout hold-off" should
> yield less than an additional 100 LOC, and user interface adjustments,
> probably another few dozen or so. (Semi-educated guess.) All that would be
> left then is to add an optional MAC address field to the proper table and
> connection form, maybe a checkbox to enable WOL.
> If WOL is simply too hard to code into Guacamole, then a more expansive set
> of classes in the connection API would go a long way towards being able to
> develop an extension. (From what I can see of the API docs, there appears to
> be one call that would allow us to start the WOL process, but there are
> several others necessary, for example; being able to hold off the connection
> timeout while the remote station completes waking up. We do, after all, want
> this to be a seamless process to the end user.)
>
> ===End TL;DR===
>
> It seems to me that there are several reasonable use cases for such a
> feature, even if it is an extension and not a core component, though it seems
> this would probably be easier to merge into core as it would work more
> elegantly with some database integration, which I did not see in the API
> docs. (Admittedly, might not have looked closely enough, and I don't really
> code Java, so I'm not sure what's in that section.)
> I do think this would go a long way in scoring a decent amount of points for
> this project. It seems like there are others out there who support such a
> feature, hacky as it may be in some products.
>
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