Pinging a machine with WOL enabled

MrSlithy used Ask the Experts™
Sometimes I notice machines that appear to be off in some aspects on the network but are actually still pingable.

What differences in ping if any would a person who has come from an environment where WOL is not used  to environment where wake on LAN is used locally  and all machines are set to use it?
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Sam MahIT manager

There would be no differences in ping.  Some software may tell you the computer is 'ON', since they will respond via a 'ping'.  But you won't be able to browse the computer, because it's actually off.

Also, maybe by keeping the ping alive, it might keep the DHCP address assigned, depending on length of DHCP lease.

WOL would be nice to save power, and access a computer when needed, or when scheduled services are required at night.  Also, increases security of workstations.

Maybe the computers have Intel AMT? There is a setting to turn OFF 'Respond to Ping' in the Intel AMT settings.  If un-checked, the computer will not respond to ping.


So it is true by what you're saying but a computer that is turned off in a wake on LAN environment or wake on LAN is in play would respond to a ping request?

If a computer does not respond to a ping request in a wake on LAN environment then is wake on LAN possibly not enabled on that computer or some other problem?
IT manager
#1:  A computer can be configured with WOL off, and respond to PING, if it has Intel AMT configured, and ping response is checked in AMT settings.  Do you computers have Intel AMT? Typically, you can open a web page of the computer with Intel AMT configured by: http://(computer IP address):16992
-  If WOL is enabled, the computer may not respond to ping, but will WAKE UP if sent magic packets specific for WOL.

#2: If the computer does not respond to ping, that doesn't mean WOL is enabled or not.  WOL is INDEPENDENT of ping replies, more specifically, ICMP requests.  The only way to tell is from the network card settings (in Windows) for WOL and under Power Management, and CHECK WOL.


Yes. I see. I see now that I am barking up the wrong tree. I am doing some work in a network that I'm normally not in and I was told that wake on LAN was configured on every computer. I also see that some computers that are turned off respond to ping request when they are off and others do not. I will look into these additional settings.

I was looking at the differences and did not think about anything other then wake on LAN as being a player. Thank you

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