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    DHCP custom set hostname are not resolving

    DHCP and DNS
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    • GertjanG
      Gertjan @CloudNode
      last edited by

      @iptvcld said in DHCP custom set hostname are not resolving:

      Any ides?

      The most obvious one.
      Netgate Adds Kea DHCP to pfSense Plus Software Version 23.09

      4060e463-a0dd-4dc3-baa8-5631d7a2cf3d-image.png

      What do you use ?

      Btw : when you set up a 'DHCP Static MAC Lease', you don't change the name of the host on the host itself.
      What you do 'change' is that the host name you've decralred is writtien in to the local pfSense cache, so your other network device can now use this name, and find the IP of your device.

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

      C 1 Reply Last reply Reply Quote 0
      • C
        CloudNode @Gertjan
        last edited by

        @Gertjan I am using ISC DHCP, I am also aware that changing the hostname vis pfSense will not change the actual host name of the client device.

        My question is, how can I change the DHCP resolved hostname without setting a static IP? When i set a static IP and change the hostname under the static mapping section, the new hostname name is able to be resolved via pinging that, however when I try to do the same without setting an IP, the name does not resolve.

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

          @iptvcld Personally I never understand this line of thinking... If your going to take the time to want to resolve some fqdn to set it up in a reservation.. Just set the IP while your in there..

          So you want to set the name, but just pull some whatever IP from the pool? Why not just set it? That way even if dns fails to resolve - you prob know what its IP is ;)

          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 2.7.2, 24.11

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          • C
            CloudNode @johnpoz
            last edited by

            @johnpoz I was thinking that as well but I have a bunch of dynamic IP devices that just have the IP as the hostname in pfSense. Sometimes these devices will need to join a different VLAN (for whatever reason, testing, etc..) and if i ser that device to a static IP on LAN lets say then if i were to connect that device to a different WIFI on VLAN 10 for example IOT, then that will break as the static set IP would not be in the same range.

            dont know why this does not work by setting the mac with a custom hostname - it should update and resolve.

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

              @iptvcld said in DHCP custom set hostname are not resolving:

              hen that will break as the static set IP would not be in the same range.

              huh?? Why would you set it on the device.. Set the reservation in dhcp, now if on network A it gets IP address X, if it moves to network B set that reservation to give it IP address Y.. Which is on the B network, etc.

              Example I have my ipad so it always gets the same last octet on whatever wifi network its on.. Be it my roku network, or my psk network or my trusted network it auths with eap-tls, 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 2.7.2, 24.11

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              • C
                CloudNode @johnpoz
                last edited by

                @johnpoz oh that makes sense.. and good tip for setting the last octet. So it looks like i still need to set the ip as well? I was hoping not to TBH., but if it is not possible then I have no choice.

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

                  @iptvcld Not sure if not possible - to be honest have never tried it.. Since it makes no sense to me to ever do such a thing. If I want to be able to resolve something, and going to take the time to setup a reservation so it has the name I want, why would you not just set the IP??

                  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 2.7.2, 24.11

                  C 2 Replies Last reply Reply Quote 0
                  • C
                    CloudNode @johnpoz
                    last edited by

                    @johnpoz I am going to have to decrease my DHCP scopes and leave more space as I did not account for many statics.

                    1 Reply Last reply Reply Quote 0
                    • C
                      CloudNode @johnpoz
                      last edited by

                      @johnpoz while on this topic, how do you manage devices that have 2 mac addresses such as a laptop (wifi and ethernet) - would you have to add 2 static entries? Or is there a better way perhaps via Client Identifier

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

                        @iptvcld I don't really have such devices.. The only devices on my wifi are devices that are mobile - I really don't have anything that moves from wired to wireless all the time?

                        My pc the wireless is disabled, my work laptop is wired while I am home working..

                        If I did fire up my wireless interface on either of those devices I wouldn't really care what its IP is, etc.

                        But if you have some device that you move about from wired to wireless, just setup 2 different IPs for the different macs..

                        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 2.7.2, 24.11

                        C 1 Reply Last reply Reply Quote 0
                        • C
                          CloudNode @johnpoz
                          last edited by

                          @johnpoz or I can setup 2 statics for each Mac using the same IP to sure if a device roams from eth to wifi that the IP will remain the same. I am using AdGuard Home as my dns server and a device may have some additional rules based on the set IP. So if that IP changes, I will have issues and unfortunately AdGuard cannot identify via MAC unless I use their DHCP server.

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

                            @iptvcld said in DHCP custom set hostname are not resolving:

                            I can setup 2 statics for each Mac using the same IP

                            Yeah I don't think it will let you do that.. I don't think it will let you set a reservation for mac abc to 192.168.1.100 and mac xyz to 192.168.1.100

                            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 2.7.2, 24.11

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                            • C
                              CloudNode @johnpoz
                              last edited by

                              @johnpoz Ok so it works, but not the best. I had to reboot the laptop each time even if I do a release and renew - not the best. Seems like I will need to have 2 IPs reserved for a laptop with host names such as LenovoWifi/LenovoEth and then in AdGuard (my DNS) - I would need 2 persistent clients using both IPs and have the same custom filters for both. Dirty..

                              GertjanG 1 Reply Last reply Reply Quote 0
                              • GertjanG
                                Gertjan @CloudNode
                                last edited by

                                @iptvcld said in DHCP custom set hostname are not resolving:

                                I had to reboot the laptop each time even if I do a release and renew - not the best

                                If it's a windows PC :

                                ipconfig /release
                                ipconfig /renew
                                

                                will do.

                                And that's even not needed.
                                A cable disconnect, and the device will 'loose' that lease by default.
                                When you select then with the Wifi a SSID, a lease will be obtained automatically.

                                When going back to cable, it might be best to actually disconnect - mouse click - from the SSID, and then put the cable in place.
                                Always worked for me like that for the better part of this century.
                                Info valid for every possible OS.

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

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