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    Help: Frequent DHCP disconnects

    Scheduled Pinned Locked Moved DHCP and DNS
    13 Posts 3 Posters 2.4k Views
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    • johnpozJ Offline
      johnpoz LAYER 8 Global Moderator
      last edited by

      why did you hid the mac address?  You do understand that is completely useless for anyone in finding you.  Most we could do with it is tell what hardware it was from the first 3 numbers.

      Why is your client sending discover after he sends out dhcpack saying ok I will take that lease, and then 19 seconds later he sends another discover?

      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 25.07.1 | Lab VMs 2.8.1, 25.07.1

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      • I Offline
        Isegrim
        last edited by

        @johnpoz:

        why did you hid the mac address?  You do understand that is completely useless for anyone in finding you.  Most we could do with it is tell what hardware it was from the first 3 numbers.

        Why is your client sending discover after he sends out dhcpack saying ok I will take that lease, and then 19 seconds later he sends another discover?

        No i didn't know that's all you can do with a mac adress.
        Even thoug i deleted the double lease. My dhcp lease file looks like this the next day:
        lease 10.1.2.21 {
          starts 3 2015/09/23 21:14:14;
          ends 3 2015/09/23 23:14:14;
          cltt 3 2015/09/23 21:14:14;
          binding state active;
          next binding state free;
          rewind binding state free;
          hardware ethernet 70:9e:29:db:e2:5d;
          uid "\001p\236)\333\342]";
        }
        server-duid "\000\001\000\001\035\224\203\014\000\031f\325VJ";

        lease 10.1.2.21 {
          starts 3 2015/09/23 21:14:34;
          ends 3 2015/09/23 23:14:34;
          cltt 3 2015/09/23 21:14:34;
          binding state active;
          next binding state free;
          rewind binding state free;
          hardware ethernet 70:9e:29:db:e2:5d;
          uid "\001p\236)\333\342]";
        }

        Looks like it's sending a discover request two times because of the double lease. I can't get rid of it.

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        • C Offline
          cmb
          last edited by

          That has nothing to do with the leases contents. The fact it's there multiple times is a symptom of the problem with the client, or the network in between, nothing to do with the cause.

          The client either isn't getting the response from the server, or it's refusing it for some reason, and re-issuing the request. Look at the client, that's where the issue resides.

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          • johnpozJ Offline
            johnpoz LAYER 8 Global Moderator
            last edited by

            "Looks like it's sending a discover request two times because of the double lease"

            No that is NOT how it works!!!  As cmb stated the issue is on your CLIENT!!

            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 25.07.1 | Lab VMs 2.8.1, 25.07.1

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            • I Offline
              Isegrim
              last edited by

              How can it be the client? Setting it to a static ip is the only change i can make on the client side. The only thing between client and server is a unmanaged switch.

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              • C Offline
                cmb
                last edited by

                Only the client controls whether and when it sends a DHCPDISCOVER. Either the offer isn't getting back to the client (network in between somewhere is dropping it) or the client is refusing the lease.

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                • I Offline
                  Isegrim
                  last edited by

                  I guess it's not an dhcp issue after all. Got this today : "a lan cable is not connected".  My wan seems to drop the connection every couple of hours.

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                  • johnpozJ Offline
                    johnpoz LAYER 8 Global Moderator
                    last edited by

                    what would your pfsense wan have to do with a client sending multiple discovers?

                    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 25.07.1 | Lab VMs 2.8.1, 25.07.1

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                    • I Offline
                      Isegrim
                      last edited by

                      @johnpoz:

                      what would your pfsense wan have to do with a client sending multiple discovers?

                      I don't know. The client i mentioned seems to send a discover each time the drop happens, while my pc gives me a dns error for a couple of seconds.

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                      • I Offline
                        Isegrim
                        last edited by

                        Is there no body that can help me with this? A dropping internet connection is the worst.

                        Before anyone says it's the client. I did hook up my old  linksys e4200 and did work normally over the weekend.

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                        • C Offline
                          cmb
                          last edited by

                          @Isegrim:

                          I guess it's not an dhcp issue after all. Got this today : "a lan cable is not connected".  My wan seems to drop the connection every couple of hours.

                          That would explain why it's grabbing another lease, it's losing link to the switch it's plugged into. When it re-gains link, it'll request another DHCP lease. That has nothing to do with your WAN connection, and nothing you've shown indicates your WAN is dropping.

                          When you switched to the Linksys I'm guessing you changed switches as well, or changed something else about where that client machine's plugged in.

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                          • I Offline
                            Isegrim
                            last edited by

                            That would explain why it's grabbing another lease, it's losing link to the switch it's plugged into. When it re-gains link, it'll request another DHCP lease. That has nothing to do with your WAN connection, and nothing you've shown indicates your WAN is dropping.

                            When you switched to the Linksys I'm guessing you changed switches as well, or changed something else about where that client machine's plugged in.

                            Yes.
                            Before: Pfsense > switch 1 > switch 2 > work pc / console & TV | pfsense > switch 1 > a tv and a couple of other entertainment devices.
                            After: Linksys > switch 1 > work pc / console & TV. Everything else is connected wirelessly in this setup.
                            i'll get another switch and see if that fixes my issues.

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