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Computer does not see DHCP on PXE-Boot, but it does with Windows running

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  • T
    Tywyn
    last edited by Sep 4, 2017, 10:41 AM

    Hi there,

    I have a strange behaviour here trying to register some hosts.

    • Assume I have Room1 and Room2 and ComputerA is in Room1.
      Trying to pxe-boot fails, because ComputerA in Room1 does not see the dhcp-server. I also do not see the MAC-Adress in the /var/log/daemon.log.
    • Taking ComputerA to Room2, PXE works fine, registration also and also dhcp-log shows ComputerA.
    • Taking ComputerA back to Room1: PXE-Boot still fails, but when I start Windows and configure network to use dhcp I immediately get an ip-address from the dhcp.

    Same Computer on PXE boot gets an IP in Room2, but not in Room1 but it gets an ip via dhcp when windows is running in Room1.

    Any ideas?

    Thanx in advance
    Rainer

    1 Reply Last reply Reply Quote 0
    • W
      Wayne Workman @george1421
      last edited by Wayne Workman Sep 4, 2017, 8:37 AM Sep 4, 2017, 2:36 PM

      @george1421 I’ve had this problem before, it was a port-fast issue on a particular switch. It could also be a vlan issue, but I think that’s less likely.

      @Tywyn in the room where it doesn’t work right, put a mini-switch (a dumb switch) between the building and the computer and see if that works.

      Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
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      • G
        george1421 Moderator
        last edited by Sep 4, 2017, 11:47 AM

        Let me see if I understand the truth table here.

        Computer A in room 1 = no pxe boot
        Computer A in room 2 = pxe boot and imaging.
        Computer A back in room 1 = Windows boot + dhcp.

        OK So I would have to ask this.

        1. When computer A is in room 2 what is the dhcp address (specifically)?
        2. When computer A is in room 1 what is the dhcp address (when booted in windows)
        3. Do each rooms have their own subnet or does your whole building have the same subnet?
        4. Is there a router in the mix some place between the FOG server and these two classrooms?
        5. Is the dhcp server for your network a windows dhcp server or linux?

        Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

        W 1 Reply Last reply Sep 4, 2017, 2:36 PM Reply Quote 0
        • W
          Wayne Workman @george1421
          last edited by Wayne Workman Sep 4, 2017, 8:37 AM Sep 4, 2017, 2:36 PM

          @george1421 I’ve had this problem before, it was a port-fast issue on a particular switch. It could also be a vlan issue, but I think that’s less likely.

          @Tywyn in the room where it doesn’t work right, put a mini-switch (a dumb switch) between the building and the computer and see if that works.

          Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
          Daily Clean Installation Results:
          https://fogtesting.fogproject.us/
          FOG Reporting:
          https://fog-external-reporting-results.fogproject.us/

          1 Reply Last reply Reply Quote 0
          • T
            Tywyn
            last edited by Tywyn Sep 6, 2017, 2:45 AM Sep 6, 2017, 8:44 AM

            @Wayne-Workman, @george1421 Thank you, gentlemen. It was indeed a portfast issue. Enabling portfast on the specific switches solved the problem.
            Btw: Your hint to put a dump hub/switch between client and network dose did solve the problem as well.

            G 1 Reply Last reply Sep 6, 2017, 9:41 AM Reply Quote 0
            • G
              george1421 Moderator @Tywyn
              last edited by Sep 6, 2017, 9:41 AM

              @tywyn said in Computer does not see DHCP on PXE-Boot, but it does with Windows running:

              Your hint to put a dump hub/switch between client and network dose did solve the problem as well.

              FWIW: This is a quick test we can use to see if standard spanning tree is the issue. The dumb switch will keep the building switch from transitioning during the boot of FOS.

              Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

              1 Reply Last reply Reply Quote 0
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