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    Switch Doesn't accept DHCP Lease after Pfsense service gets boot late after the switch is already booted.

    Scheduled Pinned Locked Moved DHCP and DNS
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    • AndyRHA
      AndyRH
      last edited by

      To me it sounds like the clients are coming up faster than pfSense and think they are on a different network and are dropping their IPs.
      Rebooting the switch will make the clients re-evaluate what network they are on and request an address when the network comes on-line.

      As others have suggested, review the clients, my guess is you will find they have 169.254 addresses.
      pfSense will never start faster then an unmanaged switch.

      I do not have a solution other than what you are doing or simply waiting for the clients to check again for a DHCP server.

      o||||o
      7100-1u

      johnpozJ P 2 Replies Last reply Reply Quote 0
      • johnpozJ
        johnpoz LAYER 8 Global Moderator @AndyRH
        last edited by

        @AndyRH said in Switch Doesn't accept DHCP Lease after Pfsense service gets boot late after the switch is already booted.:

        simply waiting for the clients to check again for a DHCP server.

        Yeah they should - quick google

        https://learn.microsoft.com/en-us/windows-server/troubleshoot/how-to-use-automatic-tcpip-addressing-without-a-dh#example-1-no-previous-ip-address-and-no-dhcp-server

        And it looks like windows will check every 3 minutes after it has gone with the 169.254 address

        "An error message is presented to the user and discover messages are transmitted every 3 minutes."

        Or could be 5 minutes?

        "The computer then broadcasts four discover messages, and after every 5 minutes it repeats the whole procedure until a DHCP server comes on line."

        Depending on if it had a previous IP or if lease had expired, etc.

        An intelligent man is sometimes forced to be drunk to spend time with his fools
        If you get confused: Listen to the Music Play
        Please don't Chat/PM me for help, unless mod related
        SG-4860 24.11 | Lab VMs 2.8, 24.11

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        • P
          pjaiswal0231 @AndyRH
          last edited by

          @AndyRH thanks I also thought so as in west africa the price of managed switch are 3 times or 4 times higher then the other places so i have to wait till some one goes to UAE and pick one up for saving the cost

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          • P
            pjaiswal0231 @johnpoz
            last edited by

            @johnpoz what you are saying is true but in my scenario it didn't happens, the only solution is reboot the switch as it is stuck like this for 3 hours then also nothing happen so reboot is the only solution, I will try to change LAN card and check one that is the easiest and cheapest solution.

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            • GertjanG
              Gertjan @pjaiswal0231
              last edited by

              @pjaiswal0231

              The ultimate test tool - you can start it with one click :

              950ba855-0146-4878-b4c9-152393d7cd09-image.png

              Enter first :
              LAN, because you want to capture on your pfSEnse LAN
              UDP because DHCP is 'UDP' only
              Ports 67 and 68 because DHCP uses these ports.
              And "Full" details as you are the admin, and you want details.

              Now hit start !

              And you'll see the request and answers.

              If you're in a hurry, go to a LAN device, a PC, and enter the magic command :

              ipconfig /renew4
              

              The packet capture will show the DHCP exchanges in real time.

              No "help me" PM's please. Use the forum, the community will thank you.
              Edit : and where are the logs ??

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              • johnpozJ
                johnpoz LAYER 8 Global Moderator @pjaiswal0231
                last edited by johnpoz

                @pjaiswal0231 please answer some basic questions.. Does your pc get a 169.254.x.x address?

                Is dhcp even running on pfsense? What dhcp server are you using on pfsense, shoot what version of pfsense are you even using?

                Is the lan interface of pfsense even coming up - do you see lights on the pfsense port and switch ports? Can you console in to pfsense?

                The only thing an unmanaged switch does is provide connection between your pc and pfsense.. You sure shouldn't have to reboot it just because it came up before the devices connected to it - pfsense or PC..

                What switch is this - maybe its just a POS? A managed switch isn't going to make any difference here really if all your doing is single vlan stuff.. What OS is your PC even running? For all we know your still running windows ME or something?

                Vs rebooting the switch - what happens if you just unplug the the port from from the switch or pfsense or pc and plug it back in?

                An intelligent man is sometimes forced to be drunk to spend time with his fools
                If you get confused: Listen to the Music Play
                Please don't Chat/PM me for help, unless mod related
                SG-4860 24.11 | Lab VMs 2.8, 24.11

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                • P
                  pjaiswal0231 @johnpoz
                  last edited by

                  @johnpoz I will share you all the details and snapshot tomorrow.

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                  • P
                    pjaiswal0231
                    last edited by

                    Hi, The PfSense Version 2.7.2-RELEASE
                    I have also attached a screen shot of the DHCP Server.

                    But some thing happened it is fixed automatically

                    7d726ea2-b71d-4cae-8e99-2ca70c5fa6d8-image.png

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                    • P
                      pjaiswal0231 @pjaiswal0231
                      last edited by

                      @pjaiswal0231 I have also made changes I disabled IPV6 in DHCP Server, Router Advertisement and on the LAN interface i changed from auto negotiation to 100 full duplex according to my switch after that i rebooted the server 5 to 6 times now issue is not coming

                      johnpozJ 1 Reply Last reply Reply Quote 0
                      • johnpozJ
                        johnpoz LAYER 8 Global Moderator @pjaiswal0231
                        last edited by

                        @pjaiswal0231 said in Switch Doesn't accept DHCP Lease after Pfsense service gets boot late after the switch is already booted.:

                        i changed from auto negotiation to 100 full duplex according to my switch

                        So this dumb switch is also ancient - 100 full duplex.. ouch..

                        An intelligent man is sometimes forced to be drunk to spend time with his fools
                        If you get confused: Listen to the Music Play
                        Please don't Chat/PM me for help, unless mod related
                        SG-4860 24.11 | Lab VMs 2.8, 24.11

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