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NBP filesize is 0 Bytes; PXE-E18: Server response timeout

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  • S
    Sebastian Roth Moderator
    last edited by Dec 23, 2020, 7:09 PM

    @foggymind said in NBP filesize is 0 Bytes; PXE-E18: Server response timeout:

    Looks like the fog server isn’t receiving the TFTP requests for some reason.

    Either firewall (though this would be either working or not) or some random DHCP server in your network is answering as well and leads the PXE booting machines to a different TFTP server address.

    Did you attempt to capture DHCP traffic in your network to see what’s going on?

    Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

    Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

    F 1 Reply Last reply Dec 23, 2020, 7:46 PM Reply Quote 0
    • F
      foggymind @Sebastian Roth
      last edited by Dec 23, 2020, 7:46 PM

      @sebastian-roth Yeah that could definitely be it, I haven’t captured the DHCP traffic, is that something I would use wireshark for?

      F 2 Replies Last reply Dec 23, 2020, 7:57 PM Reply Quote 0
      • F
        foggymind @foggymind
        last edited by foggymind Dec 23, 2020, 1:58 PM Dec 23, 2020, 7:57 PM

        @foggymind Oh yeah, one more thing I just remembered. I noticed that ALL the hosts show up as a red unknown status in the fog interface. They used to show a green status if they were on. I know that they are on but they still show that status. I’m not sure if that happened at the same time, but it definitely wasn’t like that before. The weird thing is that if I apply a computer name change, the fog client picks it up and applies the change.
        fog.png

        1 Reply Last reply Reply Quote 0
        • F
          foggymind @foggymind
          last edited by Dec 23, 2020, 8:12 PM

          @foggymind I did this (below) and captured via wireshark but it doesn’t seem to show anything interesting, just the DHCP server that’s serving the IP address. Is there something in particular I should be looking for?

          dhcp capture.png

          G 1 Reply Last reply Dec 23, 2020, 9:00 PM Reply Quote 0
          • G
            george1421 Moderator @foggymind
            last edited by george1421 Dec 23, 2020, 3:02 PM Dec 23, 2020, 9:00 PM

            @foggymind You need to capture the pxe booting process not the dhcp release /renew. This is release/renew is handled by windows where the pxe booting process is handled by the uefi/pxe rom. The process is to start wireshark with a capture filter of port 67 or port 68 to capture the dhcp process. If your fog server and target computers are on the same subnet then you can use tcpdump on the fog server to get the best details into what is not working.

            Again are your clients that you are trying to pxe boot beyond a router? I have see (and again just recently) that if your MTU of the link is set below the block size for tftp the file will not transfer because the packets will be fragmented. tftp doesn’t handle fragmented packets. So everything will look like its working up to the point where it tries to send the file to the target computer. If everything is on a LAN and your mtu is the default of 1500 then we should look elsewhere.

            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!

            F 1 Reply Last reply Feb 12, 2021, 3:27 PM Reply Quote 0
            • F
              foggymind
              last edited by Feb 12, 2021, 2:01 PM

              This post is deleted!
              1 Reply Last reply Reply Quote 0
              • F
                foggymind
                last edited by Feb 12, 2021, 2:03 PM

                I’m taking another look at this and basically have no idea where to go from here, any help would be greatly appreciated!

                F 1 Reply Last reply Feb 12, 2021, 2:07 PM Reply Quote 0
                • F
                  foggymind @foggymind
                  last edited by Feb 12, 2021, 2:07 PM

                  @foggymind Another note, I seem to be able to rename systems so communication with the fog client seems to be working.

                  1 Reply Last reply Reply Quote 0
                  • F
                    foggymind @george1421
                    last edited by Feb 12, 2021, 3:27 PM

                    @george1421 I ran tcpdump on the fog server and got the following results.

                    ac641d1e-50a2-444e-b789-7902462f4d64-image.png

                    G 1 Reply Last reply Feb 12, 2021, 3:55 PM Reply Quote 0
                    • G
                      george1421 Moderator @foggymind
                      last edited by Feb 12, 2021, 3:55 PM

                      @foggymind What was your capture filter on the FOG sever? Was it according to the tutorial? https://forums.fogproject.org/topic/9673/when-dhcp-pxe-booting-process-goes-bad-and-you-have-no-clue

                      From the screen shot it looks strange in that there was a discover, then 3 offers from the dhcp server and then after 4 seconds the client sends the request. What is the target computer playing hard to get?

                      I would expect to see after that ACK, a query from the target computer to the FOG server asking for the file on udp port 69.

                      Make sure you have the proper capture filter. Once you have a good pcap upload it to a file share site and post the link here or IM me the link. I need to look into each packet to find out what is going wrong. From the picture it should be working.

                      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!

                      F 1 Reply Last reply Feb 12, 2021, 4:20 PM Reply Quote 0
                      • S
                        Sebastian Roth Moderator
                        last edited by Feb 12, 2021, 3:59 PM

                        I am wondering why we see three offers all coming from the very same IP. Is this the way Windows DHCP servers do this when they are in a sync pool?

                        @foggymind Would be helpful if you could save and upload a PCAP file from Wireshark so we can have a deeper look as well to be able to help. If you don’t want to post this to the public then send George and/or me a private message in the forum.

                        Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                        Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                        1 Reply Last reply Reply Quote 0
                        • F
                          foggymind @george1421
                          last edited by Feb 12, 2021, 4:20 PM

                          @george1421
                          Thanks for the quick reply!

                          From the screen shot it looks strange in that there was a discover, then 3 offers from the dhcp server and then after 4 seconds the client sends the request. What is the target computer playing hard to get? – not sure!

                          Yes, I followed that tutorial, is there something else I need to do with the filters or just type in the command?

                          1 Reply Last reply Reply Quote 0
                          • F
                            fargat
                            last edited by Jun 7, 2021, 2:54 PM

                            Hi

                            what is solution of the problem

                            1 Reply Last reply Reply Quote 0
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