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SCCM Wake on Lan

    Question

  • Hi,

    Wake on LAN seems to be quite unreliable. has anyone experience in that area ?

    My server seems to have a WOL configuration which is working, since it was able to wake up clients in different subnets. But as soon as the Computers are turned off one day it does not work anymore.

    The SCCM log looks good, no errors at all. And I can verify that the configuration is working.

    As far as i know the SCCM needs a valid hardware inventory, i do not think that within one day the data is invalid. (Since i tested it over a period of one week, and turned the computer on serveral times in that week)

    The only thing i can imagine ist the power saving option. Does that depend on the drivers installed in the device manager ?

    The energy saving mode is turned off in the BIOS settings, nevertheless after one day he won't wake up anymore.

    does a BIOS update make sense ?

     

    Has anyonne an idea ? Has anyone managed to implement WOL successfully/reliable ?

     

    Kind Regards

    moehring

     

    Tuesday, September 20, 2011 8:59 AM

Answers

  • There are many factors why your machines won't wake up.  One is the Arp and routing table on the router.  If that clears out, as some do after 24 hours, then you won't be able to turn them on becuase the router doesn't know where they are.

    Test with a machine off for 2 days.  Use a free WOL tool.  If that can wake it and ConfigMgr can't then you have a problem with a port or something else.  We have the WOL packet blocked across routers so we can't use WOL outside of the single subnet.  It also depends on which method you are using to wake them up and the network card/driver as you mentioned.

    Most people have implmented out of band managment to get past some of the issues with the WOL technology.  Otherwise you can invest in 1E night watchman that keeps at least 1 machine on in the subnet and uses it to send out the packets to wake the machines.

    Yes, there are problems with WOL but it generally isn't in SCCM it is network or individual computer that is causing the issues.


    http://www.sccm-tools.com http://sms-hints-tricks.blogspot.com
    • Marked as answer by moehringd Friday, October 21, 2011 11:14 AM
    Saturday, September 24, 2011 11:28 AM

All replies

  • There are LOT of customers who use WOL. There are lot of dependency involved in this. Have you scheduled any mandatory advert to send the magic packet? have you gone through WOL related log file ?

     http://technet.microsoft.com/en-us/library/bb632574.aspx

    Some more interesting points about WOL http://blogs.technet.com/b/smsandmom/archive/2008/03/04/configmgr-2007-implementing-wake-on-lan-wol.aspx

    Troubleshooting steps : http://technet.microsoft.com/en-us/library/bb694164.aspx


    Anoop C Nair - Twitter @anoopmannur

    MY BLOG:  http://anoopmannur.wordpress.com

    SCCM Professionals

    This posting is provided AS-IS with no warranties/guarantees and confers no rights.

    Tuesday, September 20, 2011 1:14 PM
  • There are many factors why your machines won't wake up.  One is the Arp and routing table on the router.  If that clears out, as some do after 24 hours, then you won't be able to turn them on becuase the router doesn't know where they are.

    Test with a machine off for 2 days.  Use a free WOL tool.  If that can wake it and ConfigMgr can't then you have a problem with a port or something else.  We have the WOL packet blocked across routers so we can't use WOL outside of the single subnet.  It also depends on which method you are using to wake them up and the network card/driver as you mentioned.

    Most people have implmented out of band managment to get past some of the issues with the WOL technology.  Otherwise you can invest in 1E night watchman that keeps at least 1 machine on in the subnet and uses it to send out the packets to wake the machines.

    Yes, there are problems with WOL but it generally isn't in SCCM it is network or individual computer that is causing the issues.


    http://www.sccm-tools.com http://sms-hints-tricks.blogspot.com
    • Marked as answer by moehringd Friday, October 21, 2011 11:14 AM
    Saturday, September 24, 2011 11:28 AM
  • Hi,

     

    unfortunately I did not have the time to read the links precisely.

    But as far as the logs are concerned everything seems fine even though the machines are not waking up .

    I think there is only the WOL.log on the sccm server to check , which seems fine.

     

    Monday, September 26, 2011 12:22 PM
  • Have you tested what Matthew suggested?
    You might also have to use a tool like Wireshark or NetMon to trave the activities.
    Torsten Meringer | http://www.mssccmfaq.de
    Monday, September 26, 2011 12:48 PM
  • Hi, thank you for your response.

    We were able to "solve" the problem. Now I am reading your post and I think it matches with your suggested solution.

    I haven't had the time to test it , but my colleague from networking services told me, that the mac table are only valid for half an hour !!! This would explain why machines won't wake up...

     

    since I do not know about the network configuration I only could concentrate on the SCCM as possible failure source.

     

    Thank you for your assisstance

     

     

     

    Friday, October 21, 2011 11:17 AM
  • Hi ,

    i have the same issue my packet send successfully from SCCM but machine cant wake up , what should i check , while i already try a freeware tool on same machine its works successfully


    Usama Arif
    Tuesday, November 22, 2011 6:59 AM
  • See http://technet.microsoft.com/en-us/library/bb932199.aspx.
    It's also worth checking what moehringd mentioned: the ARP cache on some network devices might store MAC information only for a limited amount of time. You should also use Netmon or Wireshark to get a detailed view what's happening behind the scenes.
    It would be great if you could avoid double postings. You already asked the exact same question in http://social.technet.microsoft.com/Forums/en-US/configmgrgeneral/thread/9d8b8dff-c5a4-45b7-abe1-cd4c3e304dc3/#48d0316d-d88c-445d-800d-d5046b6e0087 (which is the better place to ask, since this subforum is for 'Power Management' related questions)


    Torsten Meringer | http://www.mssccmfaq.de

    Tuesday, November 22, 2011 8:23 AM