Solved

Wake-on Lan works only when the workstation has been shut down recently

Posted on 2008-10-24
3
1,110 Views
Last Modified: 2012-05-05
We need to wake-up workstations for several reasons, and notice swe could not get a lab of IBMs to startup. However, if we turn these machines on manually and then turn them off again, they seem to respond to remote WOL. If we leave them for a while they stop responding to WOL. We thought maybe some power management activity was happening that left the NICs or other components unresponsive while PCs were running, which then continued into a subsequent shutdown, but we could not find any power management settings that would cause this. Any Ideas?
0
Comment
Question by:quiet_tree
3 Comments
 
LVL 3

Expert Comment

by:hancke
ID: 22805321
Did you check the BIOS settings?  What are the computer make and models?
0
 
LVL 23

Accepted Solution

by:
Mysidia earned 500 total points
ID: 22810107
Most likely for a short period of time after it's shutdown, the system is on soft-off state i.e. ACPI G2 state, with power sitill reserved for the network card.

Some time later, perhaps the system is going into mechanical off state (ACPI G3 state),  or components that need to be powered for WOL to work have discharged.

WOL will not work unless a sufficient amount of standby power is present, and among other things, the network card needs to have standby power applied to it.


Wake on LAN possibly works in ACPI system states G1, G2, S1, S2, S3, S4.
But will not work in when the system is in G3 state.

In general: you need to check your BIOS setup menu, that you can access while booting the system.

Make sure that Wake on LAN is enabled,  make sure any "Wake on LAN from standby"  option is enabled,  so the system reserves power for the network card.

There may be additional system wakeup/standby power/input options you need to turn on.. i.e.  more of the "Wake on LAN from Keyboard/Modem/LAN"
options may need to be on than you have turned on.

These are often disabled by default to avoid consuming extra power in standby mode.







0
 

Author Comment

by:quiet_tree
ID: 22813868
Thank you
0

Featured Post

Better Security Awareness With Threat Intelligence

See how one of the leading financial services organizations uses Recorded Future as part of a holistic threat intelligence program to promote security awareness and proactively and efficiently identify threats.

Join & Write a Comment

In this tutorial I will show you with short command examples how to obtain a packet footprint of all traffic flowing thru your Juniper device running ScreenOS. I do not know the exact firmware requirement, but I think the fprofile command is availab…
 One of the main issues with network wires is that you never have enough.  You run plenty and plan for the worst case but you still end up needing more.  What many people do not realize is with 10BaseT and 100BaseT (but not 1000BaseT) networks you …
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…
This video shows how to remove a single email address from the Outlook 2010 Auto Suggestion memory. NOTE: For Outlook 2016 and 2013 perform the exact same steps. Open a new email: Click the New email button in Outlook. Start typing the address: …

746 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now