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    How to configure DHCP Proxy?

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    • Wayne WorkmanW
      Wayne Workman
      last edited by

      Try restarting the service,

      and check your firewall.
      [CODE]sudo iptables -L[/CODE]

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      • ?
        A Former User
        last edited by

        everything is good according to the “Troubleshoot TFTP” guide.
        I also changed permissions.
        yet, can’t boot from ws.
        what should I do next?

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        • Wayne WorkmanW
          Wayne Workman
          last edited by

          What’s the output of this:

          [CODE]ls -a /tftpboot[/CODE]

          and, try changing /etc/dnsmasq.d/ltsp.conf:

          this line:
          [FONT=Consolas]dhcp-boot=undionly.kpxe,10.0.0.210 [/FONT]
          [FONT=Consolas]to:[/FONT]
          [FONT=Consolas]dhcp-boot=undionly.kpxe,[/FONT][FONT=Consolas]10.0.0.210[/FONT][FONT=Consolas],10.0.0.210[/FONT]

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          • ?
            A Former User
            last edited by

            output is attached.

            I edited the /etc/dnsmasq.d/ltsp.conf file. same error.

            [url=“/_imported_xf_attachments/1/1875_ls -a output.PNG?:”]ls -a output.PNG[/url]

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            • Wayne WorkmanW
              Wayne Workman
              last edited by

              What happens when you try to get undionly.kpxe through command line?

              You can use Windows, or a Linux live disk for this. There are examples for testing in the “Troubleshoot TFTP” page.
              Please post the output of it.

              If you are successful, please do a TCP dump next, and post the resulting file. Here are some general instructions:

              [CODE]sudo tcpdump -w issue.pcap -i eth0[/CODE]

              You might need to change the interface name in the above command, seems like I have never had an interface named eth0 in Linux… This command will list all available interfaces. Pick the right one.
              [CODE]ip link show[/CODE]

              Run the above capture command on the FOG machine, then start the remote target host. Wait till it fails, then stop tcpdump (ctrl+c), transfer the PCAP file to your PC and examine it using wireshark. After the capture is completed, please use the MAC address of the target host as the filter for sender & receiver. This address will filter out ALL traffic that isn’t coming from or going to the target client.

              Example Filter (change the MAC addresses):
              [CODE]eth.dst == 00:0C:CC:76:4E:07 || eth.src==00:0C:CC:76:4E:07[/CODE]

              Please also post this PCAP file so we can look at it and see what’s going on. And if you don’t filter the file for us, we will need the target host’s MAC as well so we can filter it.

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              • ?
                A Former User
                last edited by

                here is the pcap file:
                [url]https://copy.com/iH3hRuI7Xcb6dfnY[/url]

                I forgot to mention that the remote host is a vm, and the network interface configured as a bridge

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                • Wayne WorkmanW
                  Wayne Workman
                  last edited by

                  The problem is that the client is asking for the wrong file.

                  It’s asking for pxelinux.0 which is not only wrong, but according to your screenshot that file does not exist - for real.

                  Re-examine ltsp.conf, make sure it’s giving either undionly.kpxe or undionly.0 and also restart the dnsmasq service and try again.

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                  • Wayne WorkmanW
                    Wayne Workman
                    last edited by

                    Also,

                    I’m not seeing a packet sent from 10.0.0.210 telling the client to use undionly.0, or 10.0.0.210 as the next-server…

                    If you look at the capture you posted, there are a total of TWO packets sent from the FOG server to the client.

                    This might mean that the DHCP server is already handing out the boot-server and file name, options 066 and 067.

                    Do you have a network hub? (not a switch)

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                    • ?
                      A Former User
                      last edited by

                      here is my ltsp.conf file:

                      [CODE]port=0
                      log-dhcp
                      tftp-root=/tftpboot
                      dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
                      dhcp-option=17,/images
                      dhcp-option=vendor:PXEClient,6,2b
                      dhcp-no-override
                      pxe-prompt=“Press F8 for boot menu”, 0
                      pxe-service=X86PC, “Boot from network”, pxelinux
                      pxe-service=X86PC, “Boot from local hard disk”, 0
                      dhcp-range=10.0.0.210,proxy
                      [/CODE]

                      I dont have a network hub.
                      again, I’m running the client under virtual box. does it matter?

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                      • Tom ElliottT
                        Tom Elliott
                        last edited by

                        Change
                        [code]port=0
                        log-dhcp
                        tftp-root=/tftpboot
                        dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
                        dhcp-option=17,/images
                        dhcp-option=vendor:PXEClient,6,2b
                        dhcp-no-override
                        pxe-prompt=“Press F8 for boot menu”, 0
                        pxe-service=X86PC, “Boot from network”, pxelinux
                        pxe-service=X86PC, “Boot from local hard disk”, 0
                        dhcp-range=10.0.0.210,proxy[/code]

                        To:

                        [code]port=0
                        log-dhcp
                        tftp-root=/tftpboot
                        dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
                        dhcp-option=17,/images
                        dhcp-option=vendor:PXEClient,6,2b
                        dhcp-no-override
                        pxe-prompt=“Press F8 for boot menu”, 0
                        pxe-service=X86PC, “Boot from network”, undionly.kpxe
                        pxe-service=X86PC, “Boot from local hard disk”, 0
                        dhcp-range=10.0.0.210,proxy[/code]

                        Then make a copy of the undionly.kpxe to undionly.kpxe.0

                        [code]sudo cp /tftpboot/undionly.kpxe /tftpboot/undionly.kpxe.0[/code]

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                        • Jaymes DriverJ
                          Jaymes Driver Developer
                          last edited by

                          [quote=“Amit Madmoni, post: 45626, member: 29386”]here is my ltsp.conf file:

                          [CODE]port=0
                          log-dhcp
                          tftp-root=/tftpboot
                          dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
                          dhcp-option=17,/images
                          dhcp-option=vendor:PXEClient,6,2b
                          dhcp-no-override
                          pxe-prompt=“Press F8 for boot menu”, 0
                          pxe-service=X86PC, “Boot from network”, pxelinux
                          pxe-service=X86PC, “Boot from local hard disk”, 0
                          dhcp-range=10.0.0.210,proxy
                          [/CODE]

                          I dont have a network hub.
                          again, I’m running the client under virtual box. does it matter?[/quote]

                          Did you restart the service after inserting the LTSP.conf file?

                          you need to successfully restart the service for your updated LTSP.conf file to be of any use to dnsmasq.

                          WARNING TO USERS: My comments are written completely devoid of emotion, do not mistake my concise to the point manner as a personal insult or attack.

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                          • Wayne WorkmanW
                            Wayne Workman
                            last edited by

                            This post is deleted!
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                            • Wayne WorkmanW
                              Wayne Workman
                              last edited by

                              [quote=“Tom Elliott, post: 45628, member: 7271”]Change
                              [code]port=0
                              log-dhcp
                              tftp-root=/tftpboot
                              dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
                              dhcp-option=17,/images
                              dhcp-option=vendor:PXEClient,6,2b
                              dhcp-no-override
                              pxe-prompt=“Press F8 for boot menu”, 0
                              pxe-service=X86PC, “Boot from network”, pxelinux
                              pxe-service=X86PC, “Boot from local hard disk”, 0
                              dhcp-range=10.0.0.210,proxy[/code]

                              To:

                              [code]port=0
                              log-dhcp
                              tftp-root=/tftpboot
                              dhcp-boot=undionly.kpxe,10.0.0.210,10.0.0.210
                              dhcp-option=17,/images
                              dhcp-option=vendor:PXEClient,6,2b
                              dhcp-no-override
                              pxe-prompt=“Press F8 for boot menu”, 0
                              pxe-service=X86PC, “Boot from network”, undionly.kpxe
                              pxe-service=X86PC, “Boot from local hard disk”, 0
                              dhcp-range=10.0.0.210,proxy[/code]

                              Then make a copy of the undionly.kpxe to undionly.kpxe.0

                              [code]sudo cp /tftpboot/undionly.kpxe /tftpboot/undionly.kpxe.0[/code][/quote]

                              But, there are zero packets sent from the FOG machine that are even assigning the next-boot server or boot file…

                              FOG sent two packets, both simply saying “File not found.” If dnsmasq were sending out additional IP configuration, we’d see a few more packets for DHCP, coming from FOG, Probably about 2 more packets.

                              So, DHCP must be telling the client to use 10.0.0.210 and pxelinux.0

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                              • ?
                                A Former User
                                last edited by

                                Yeeeeeessssss!!!
                                It’s finally working!!!

                                I just did what TOM offered and it’s working!

                                thanks a lot guys!

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                                • Wayne WorkmanW
                                  Wayne Workman
                                  last edited by

                                  This post is deleted!
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                                  • Wayne WorkmanW
                                    Wayne Workman
                                    last edited by

                                    Wiki Updated to provide troubleshooting steps for this in the future:
                                    [url]http://fogproject.org/wiki/index.php/Using_FOG_with_an_unmodifiable_DHCP_server/_Using_FOG_with_no_DHCP_server#Troubleshooting[/url]

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                                    • ?
                                      A Former User
                                      last edited by

                                      wow. I should be proud.

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