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Should i disable the dhcp on my router when i enabled dhcp on pfsense?

Scheduled Pinned Locked Moved General pfSense Questions
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  • I
    iansphnx
    last edited by Apr 18, 2017, 5:50 AM

    My setup is pfsense server lan connected to switch and router. Should i disable the dhcp on my router?

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    • D
      Derelict LAYER 8 Netgate
      last edited by Apr 18, 2017, 6:46 AM

      Impossible to answer with the given information.

      In general there should only be one DHCP server on a given network segment.

      Chattanooga, Tennessee, USA
      A comprehensive network diagram is worth 10,000 words and 15 conference calls.
      DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
      Do Not Chat For Help! NO_WAN_EGRESS(TM)

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      • B
        big_D
        last edited by Apr 18, 2017, 11:18 AM

        As Derelict says, only one DHCP server. You need to disable one or the other.

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        • I
          iansphnx
          last edited by Feb 1, 2018, 4:33 AM

          Thanks to all! this topic is already SOLVED! Thanks!

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          • J
            JKnott
            last edited by Feb 1, 2018, 11:16 AM

            In general there should only be one DHCP server on a given network segment.

            Actually, that's incorrect.  There may be reasons, such as redundancy for having more than one.  However, in that case, there has to be some means to ensure they don't try to hand out the same addresses.  The easiest way is to divide the address pool among them.  DHCP is designed to work with multiple servers.

            PfSense running on Qotom mini PC
            i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
            UniFi AC-Lite access point

            I haven't lost my mind. It's around here...somewhere...

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            • D
              Derelict LAYER 8 Netgate
              last edited by Feb 1, 2018, 11:18 AM

              Come on, man.

              One DHCP server on the network.

              Configuring multiples to work as a team is beyond the scope of this thread.

              Chattanooga, Tennessee, USA
              A comprehensive network diagram is worth 10,000 words and 15 conference calls.
              DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
              Do Not Chat For Help! NO_WAN_EGRESS(TM)

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              • J
                JKnott
                last edited by Feb 1, 2018, 9:25 PM

                I'm not saying more than one DHCP server is needed on a small network, but many people are of the opinion that you can't have more than one and that's nonsense.  As I mentioned, it is possible and is done for redundancy.  Incidentally, today I was working in the Bell Canada lab, and guess what I saw.  Lots of redundant everything, including DNS servers.  I didn't specifically see them for DHCP, but I wouldn't be surprised if they were there..

                As I mentioned, one issue that may occur with DHCP servers is multiple servers handing out the same address.  These days, the trend is to Duplicate Address Detection, which avoids that problem.  While DAD is mandatory on IPv6 and commonly used on IPv4, you can't guarantee every IPv4 device uses it, so it's best to have different address ranges for each DHCPv4 server.

                PfSense running on Qotom mini PC
                i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
                UniFi AC-Lite access point

                I haven't lost my mind. It's around here...somewhere...

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