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    DNS resolver stopped resolving one hostname

    DHCP and DNS
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    • johnpozJ
      johnpoz LAYER 8 Global Moderator @silmaril
      last edited by johnpoz

      So do you have pfsense using itself for dns?

      What is the output of your dns gui query? Which you say works - does it just list 127.0.0.1 or some other dns?

      example - that resolves fine here, just using unbound for pfsense own queries. But if you have dns setup in general, or allowing dhcp to hand out dns to pfsense it could be using that in the gui. While if your clients ask, it would just be using unbound - which is resolving or forwarding (if so to where?)

      What are you using for your local domain? Do you have any domain overrides setup, etc.

      dnslookup.png

      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

      S 1 Reply Last reply Reply Quote 0
      • S
        silmaril @johnpoz
        last edited by

        @johnpoz
        126c3a45-e009-4a83-b43f-4a68a41ab3a1-image.png

        Yes, it seems it's using itself / localhost as DNS as well as another IP which is the DSL router on the WAN interface.

        An as far as I understand, it's getting the correct answer, but it doesn't tell me, if it got the same answer from both sources.

        This lead me to an additional test:
        I connected to the pfsense via SSH and did the dig there, too.

        dig @192.168.178.1 muenchen.social returns the correct IP, but both dig @127.0.0.1 muenchen.social and dig muenchen.social don't return an answer section.

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

          Why doesn't 127.0.0.1 answer? is unbound not actually running?

          Do you not have it listening on loopback? You for sure should be able to do a query on pfsense going to loopback.

          and just normal dig should do that too..

          [21.05-RELEASE][admin@sg4860.local.lan]/root: dig muenchen.social
          
          ; <<>> DiG 9.16.15 <<>> muenchen.social
          ;; global options: +cmd
          ;; Got answer:
          ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3216
          ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
          
          ;; OPT PSEUDOSECTION:
          ; EDNS: version: 0, flags:; udp: 4096
          ;; QUESTION SECTION:
          ;muenchen.social.               IN      A
          
          ;; ANSWER SECTION:
          muenchen.social.        1414    IN      A       159.69.89.221
          
          ;; Query time: 0 msec
          ;; SERVER: 127.0.0.1#53(127.0.0.1)
          ;; WHEN: Sun Jul 11 16:17:48 CDT 2021
          ;; MSG SIZE  rcvd: 60
          
          [21.05-RELEASE][admin@sg4860.local.lan]/root: 
          

          You can see there it used loopback for the query.

          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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          • S
            silmaril @johnpoz
            last edited by

            @johnpoz
            Not sure what's happening here, but after I woke up this morning, resolving the problematic host is working again.

            pfBlockerNG is still disabled, so I don't think it has anything to do with my whitelist entry.

            I'm still trying to understand the problem. What do you mean by "is unbound running"? Which options should I check here?

            (Sorry, I don't have much knowledge about DNS, until now that was just something that worked fine 😄 ).

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

              @silmaril said in DNS resolver stopped resolving one hostname:

              pfBlockerNG is still disabled,

              Was it ( pfBlockerNG ) running when you found out that muenchen.social wasn't resolving - the first time ?
              Was it resolving to something like "10.10.10.1" or just nothing at all ?

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

              S 1 Reply Last reply Reply Quote 0
              • S
                silmaril @Gertjan
                last edited by

                @gertjan
                As far as I can reproduce it, I am pretty sure, pfBlockerNG was not running when the problem first occured.
                It did not return any IP.

                When testing with Network Analyzer on an Android phone, I got a SERVFAIL error, which seems strange, because usually it's NXDOMAIN if the name cannot be resolved.

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

                  @silmaril said in DNS resolver stopped resolving one hostname:

                  Network Analyzer on an Android phone

                  For the next time :
                  Use

                  dig muenchen.social +trace
                  

                  on the console (or : easier : ssh) access.
                  You'll have all answers on the screen.

                  Or, on a PC :

                  nslookup
                  

                  and activate the debug :

                  set debug=on
                  

                  Now enter :

                  muenchen.social
                  

                  and you have all the details.

                  I don't have android device - neither would I use such a device for these tests.

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

                  S 1 Reply Last reply Reply Quote 0
                  • S
                    silmaril @Gertjan
                    last edited by

                    @gertjan said in DNS resolver stopped resolving one hostname:

                    @silmaril said in DNS resolver stopped resolving one hostname:

                    Network Analyzer on an Android phone

                    For the next time :
                    Use

                    dig muenchen.social +trace
                    

                    on the console (or : easier : ssh) access.
                    You'll have all answers on the screen.

                    That's awesome! Thanks for this hint!

                    Or, on a PC :

                    nslookup
                    

                    My PC is running Linux ;-)

                    I don't have android device - neither would I use such a device for these tests.

                    It was just interesting because of this error code - but I will use dig ... +trace, if I encounter similar problems in the future.

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

                      btw you can install dig on your pc.. Its a MUST have for me ;)

                      Just install the bind package from isc and pick tools only..

                      here is my windows machine

                      C:\>dig
                      
                      ; <<>> DiG 9.16.18 <<>>
                      

                      if linux than yeah easy as well to install dig if you don't have it.

                      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

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

                        For pfSense :

                        pkg install bind-tools
                        

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

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

                          @gertjan didn't they make it default installed? I know I am on clean install of pfsense+ and I don't recall installing that package..

                          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

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

                            @johnpoz said in DNS resolver stopped resolving one hostname:

                            didn't they make it default installed?

                            I don't think so. But I can't remember.
                            Installed pfSense ones, version 1 ? When I was fiddling with M0n0wall. Or something like that. Seems ages (a decade ?) to me. Been upgrading since, never re installed, it.

                            edit :

                            Joined 29 Dec 2005, 21:40
                            

                            Ok, more then a decade.

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

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

                              I think it is part of base install now... When 2.5/+ came out I did clean installs.. And I don't recall having to install that, and I have dig..

                              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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