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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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    • P
      pjaiswal0231 @johnpoz
      last edited by

      @johnpoz wording i used in the earlier post for ip relay was not the senario the scenario I am mentioning it only happens when there is a power failure after the power come back on this happens all, on Pfsense LAN port the LAN card led in on and on the switch port also led is on but the dhcp is not able to provide ip. I have assign some static IP also on the LAN network but from the static IP system I am not able to ping pfsense and from pfsense also I am.not able to ping the LAN static IP but of pfsense I ping any internet IP or website it is pinging But after I reboot the switch every thing start working. It is a unmanaged switch thats why I am stuck, I can't check what is happening with the switch.

      But this scenario on power failure doesn't happen if I remove pfsense and put WiFi router and I use the WiFi router internal dhcp to provide IP when the power come back on same thing happen switch boot first and after 30 second the WiFi router services comes up all PC take ip. So in this scenario the switch doesn't have issue

      GertjanG 2 Replies Last reply Reply Quote 0
      • GertjanG
        Gertjan @pjaiswal0231
        last edited by

        @pjaiswal0231

        Lets start with this : an non managed switch isn't 100 % non managed, as there are two part you have to do yourself with a switch like this :

        1. Hook up the power.
        2. Slide in as many as network cables plugs as the switch can hold to forum a 'network'.

        And now your done. There is no more and no less.
        Switches replicate traffic on a port to a destination port.
        It doesn't care what the packers 'are' - it doesn't care about what a packets 'do'.
        So, if they are ICMP, or UDP, or TCP, or DHCP, etc, it's doesn't care ....

        So it can't have issue with 'DHCP', as it doesn't know what DHCP is.

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

        But this scenario on power failure doesn't

        Can be very bad for pfSense.
        pfSense doesn't run from a ROM (Read Only Memory) as the wallmart router does, it uses a real hard disk like your PC, NAS, phone etc. Power loses can mean : file system damaged. That's something you don't want to happen. if doubt, take an insurance (== UPS).

        What pfSense version do you use ?
        Did you change something ?
        Use this DHCP pfSense server :

        431242a3-7adf-4788-b716-421a13abd930-image.png

        and you'll be fine.

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

        1 Reply Last reply Reply Quote 0
        • 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

            P 1 Reply Last reply Reply Quote 0
            • 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

              1 Reply Last reply Reply Quote 0
              • 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.

                johnpozJ 1 Reply Last reply Reply Quote 0
                • 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 ??

                  1 Reply Last reply Reply Quote 0
                  • 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

                    P 1 Reply Last reply Reply Quote 0
                    • P
                      pjaiswal0231 @johnpoz
                      last edited by

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

                      1 Reply Last reply Reply Quote 0
                      • 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

                        P 1 Reply Last reply Reply Quote 0
                        • 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

                            1 Reply Last reply Reply Quote 0
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