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FOG DHCP problems with possible printer interference?

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FOG Problems
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  • A
    afriedman
    last edited by Dec 20, 2016, 8:40 PM

    @george1421 Spanning tree issue? Please explain.

    G 1 Reply Last reply Dec 20, 2016, 8:41 PM Reply Quote 0
    • G
      george1421 Moderator @afriedman
      last edited by george1421 Dec 20, 2016, 2:42 PM Dec 20, 2016, 8:41 PM

      @afriedman said in FOG DHCP problems with possible printer interference?:

      @george1421 Spanning tree issue? Please explain.

      I thought I did in my first post??

      If you are not using a fast spanning tree protocol the switch port won’t start transmitting data until 27 seconds after the link comes up.

      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
      • G
        george1421 Moderator
        last edited by Dec 20, 2016, 8:45 PM

        @Joe-Schmitt I think that Sebastian was working on one too using node-js. I’m not sure if is the same one you were working on or not.

        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
        • A
          afriedman
          last edited by Dec 20, 2016, 8:45 PM

          @george1421 sorry I didn’t see your original post - ill look at that.

          @Joe-Schmitt sounds good. I’ll be waiting for your answer.

          1 Reply Last reply Reply Quote 0
          • A
            afriedman
            last edited by Dec 20, 2016, 8:49 PM

            @Joe-Schmitt Thank you very much for this program.

            When I run this program, I should then turn on a different machine in the same area and look at the results on the computer where im running your program?

            1 Reply Last reply Reply Quote 0
            • J
              Joe Schmitt Senior Developer
              last edited by Joe Schmitt Dec 20, 2016, 2:50 PM Dec 20, 2016, 8:50 PM

              @afriedman Nope, the program will simulate a computer booting up requesting PXE information and capture who responds and with what.

              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! Get in contact with me (chat bubble in the top right corner) if you want to join in.

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              • A
                afriedman
                last edited by Dec 20, 2016, 8:51 PM

                @Joe-Schmitt Ahhhhhh okay. I’ll let you know the results very soon!

                1 Reply Last reply Reply Quote 0
                • G
                  george1421 Moderator
                  last edited by george1421 Dec 20, 2016, 2:57 PM Dec 20, 2016, 8:56 PM

                  @Joe-Schmitt Side note: it will need to capture at least two if not more offers from dhcp servers. If we are running dnsmasq you will get two offers right away one from the dhcp server and one from the dhcpProxy server.

                  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
                  • A
                    afriedman
                    last edited by afriedman Dec 20, 2016, 3:12 PM Dec 20, 2016, 9:11 PM

                    @Joe-Schmitt

                    http://imgur.com/a/y57wR

                    The bottom image is the first half, and the top image is the second half.

                    1 Reply Last reply Reply Quote 0
                    • A
                      afriedman
                      last edited by Dec 20, 2016, 9:27 PM

                      @Joe-Schmitt You weren’t expecting that outcome? Lol interesting.

                      1 Reply Last reply Reply Quote 0
                      • A
                        afriedman
                        last edited by Dec 20, 2016, 9:37 PM

                        @Joe-Schmitt Oh alright. Well it’s a pretty neat program.

                        @george1421 I’m going to try to talk to Cisco Technical Support either today or tomorrow about having them remote into our switch and turn on one of the fast STP protocols. I’ll let you know the results, unless you’d prefer I do something else before talking to Cisco.

                        G 2 Replies Last reply Dec 20, 2016, 9:43 PM Reply Quote 0
                        • G
                          george1421 Moderator @afriedman
                          last edited by Dec 20, 2016, 9:43 PM

                          @afriedman As I said, if you place the dumbest switch you can find (that’s still functional) between your cisco switch and the target computer. Then pxe boot the target computer, if you can get to the fog menu where you couldn’t without the dumb switch, then its most likely a spanning tree issue.

                          I can say typically they would turn on one of the fast STP protocols by default (just for this reason). There have been documented cases of target computers not getting dhcp addresses because of this.

                          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 @afriedman
                            last edited by Dec 20, 2016, 10:05 PM

                            @afriedman We’ll just taking with Joe through chat. What he’s seeing and what I thought I say was too different things.

                            It would be helpful if you can capture a pcap of the pxe booting process.

                            Please do the following (assuming your fog server, dhcp server, and pxe booting clinet are on the same subnet).

                            1. Install tcpdump on your fog server
                            2. Launch the tcpdump program with this command tcpdump -w output.pcap port 67 or port 68 or port 69 or port 4011
                            3. PXE boot the target computer until you get the error
                            4. Press ctrl-c to exit out of the tcpdump program
                            5. Upload the pcap file here for review.

                            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 1
                            • A
                              afriedman
                              last edited by Dec 20, 2016, 10:17 PM

                              @george1421

                              Amazing!! I just used a dumb switch in between that trouble computer, and it booted to FOG INSTANTLY, no hesitation.

                              Still want me to install tcpdump and follow your instructions for it?

                              G 1 Reply Last reply Dec 20, 2016, 10:18 PM Reply Quote 0
                              • G
                                george1421 Moderator @afriedman
                                last edited by george1421 Dec 20, 2016, 4:21 PM Dec 20, 2016, 10:18 PM

                                @afriedman Yes please that would help understand the data that joe’s script is spitting out.

                                But you know you need to talk with your network group about the switch configuration too, we kind of have two threads running inside this one.

                                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
                                • A
                                  afriedman
                                  last edited by Dec 20, 2016, 10:35 PM

                                  @george1421

                                  Sounds good. I’ll try to run that when I do some work from home tonight.

                                  Yeah I’m waiting on some responses from her. I believe I’ve narrowed it down to 1 specific cluster of computers (about 24-28 of them) in our building. All other 90% of computers see the FOG server with no problems.

                                  I’ll post an update when I can.

                                  1 Reply Last reply Reply Quote 0
                                  • A
                                    afriedman
                                    last edited by Dec 22, 2016, 3:16 PM

                                    @george1421

                                    Sorry about the delayed response, I was out sick yesterday.

                                    Do you want me to PXE boot a computer that isn’t booting to FOG with the tcpdump program? Or PXE boot a computer that is working with FOG?

                                    G 1 Reply Last reply Dec 22, 2016, 4:25 PM Reply Quote 0
                                    • G
                                      george1421 Moderator @afriedman
                                      last edited by Dec 22, 2016, 4:25 PM

                                      @afriedman Thinking about it a bit more, lets hold off on the tcpdump. I think you have a path forward there. Collecting a pcap would be nice to know but not need to know.

                                      IF you are still having issues after you get the spanning tree issues resolved then we can go down that path.

                                      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
                                      • A
                                        afriedman
                                        last edited by Dec 22, 2016, 4:27 PM

                                        @george1421

                                        Sounds good. I’ll update when I have more information.

                                        1 Reply Last reply Reply Quote 0
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