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    DHCP + Hostname + DDNS Problem

    Scheduled Pinned Locked Moved DHCP and DNS
    7 Posts 3 Posters 6.6k Views
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    • M
      Maps
      last edited by

      I had nothing found about this Topic.

      I have two client blackboard. Both send Client as hostname.
      I have configured 2 DHCP fixed entries with two different IPs.
      Both client use the fixed IPs, no Problem

      But the firewall send two DDNS update with Client to the nameserver with client.domain.com
      I need to overwrite the DDNS update with the Hostname configured in the DHCP setup.
      I had setup 2 fixed IP with 2 different Hostnames, but no success.

      Any ideas?
      Thanks

      Version used 2.3.3

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      • D
        doktornotor Banned
        last edited by

        No. Either fix the hostnames on the clients, or stop doing dynamic DNS with such broken things and set up static IPs for them.

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        • M
          Maps
          last edited by

          I found the option ddns-hostname for DHCP , would it work in pfsense ?

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          • D
            doktornotor Banned
            last edited by

            Never tried, no idea. Not using any of these dynamic registrations since either the DNS/DHCP is Active Directory, or to avoid restarting Unbound over and over again.

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            • I
              Inq
              last edited by

              It can be done, all you have to do is enter "deny client-updates" as a scope declaration in dhcpd.conf. Unfortunately pfsense doesn't expose this option in gui for the DHCPV4 server. What puzzles me is that option is present in gui  for the DHCPv6 server.

              Here is the description :

              "DDNS Client Updates -How Forward entries are handled when client indicates they wish to update DNS. Allow prevents DHCP from updating Forward entries, Deny indicates that DHCP will do the updates and the client should not, Ignore specifies that DHCP will do the update and the client can also attempt the update usually using a different domain name."

              The problem with making something idiot proof is that the world keeps making better idiots.

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              • M
                Maps
                last edited by

                I had checked
                ddns-hostname would work, but there is no gui to add the parameter.
                And the dhcpd.conf is rewrite at every startup per gui.

                deny client-updates don´t work for me, but same problem like ddns-hostname and startup.

                It there a possibility to add custom data when dhcpd.conf is written and save the data in the conf.xml ?

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                • I
                  Inq
                  last edited by

                  I'm not sure about the custom data saved in the config.xml. My solution was to modify /etc/inc/services.inc as follows :

                  /* write dhcpd.conf */
                  if (!@file_put_contents("{$g['dhcpd_chroot_path']}/etc/dhcpd.conf.auto", $dhcpdconf)).

                  After that at every boot pfsense rewrites dhcpd.conf.auto not dhcpd.conf. Manually modify dhcpd.conf as you wish, it should be persistent between reboots or service restarts.

                  The above solution is a hack, i do not recommend using it for production systems and it could completely break your pfsense install.

                  The problem with making something idiot proof is that the world keeps making better idiots.

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