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    DNS server not responding

    Scheduled Pinned Locked Moved General pfSense Questions
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    • Y
      yodar44
      last edited by

      i have 2 computers, one connected to the LAN port and one connected to the OPT port on my sg-1100.
      the one on LAN is working fine. the one on OPT shows no internet connection.
      when i run windows network diagnostics, it says DNS server not responding.
      ipconfig/all says
      IPv4 Address. . . . . . . . . . . : 10.100.1.3(Preferred)
      Default Gateway . . . . . . . . . : 10.100.1.1
      DHCP Server . . . . . . . . . . . : 10.100.1.1
      DNS Servers . . . . . . . . . . . : 10.100.1.1
      am i missing something in the OPT configuration, or what?

      Y 1 Reply Last reply Reply Quote 0
      • kiokomanK
        kiokoman LAYER 8
        last edited by kiokoman

        maybe a firewall rule that permit dns request?
        by default LAN is open but OPT need specific rules
        to surf the web you need at least port 53 (dns)/ 80 (http)/ 443 (https)

        ̿' ̿'\̵͇̿̿\з=(◕_◕)=ε/̵͇̿̿/'̿'̿ ̿
        Please do not use chat/PM to ask for help
        we must focus on silencing this @guest character. we must make up lies and alter the copyrights !
        Don't forget to Upvote with the 👍 button for any post you find to be helpful.

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        • Y
          yodar44 @yodar44
          last edited by

          @yodar44
          how do i do that?
          what would the rule say?

          1 Reply Last reply Reply Quote 0
          • kiokomanK
            kiokoman LAYER 8
            last edited by kiokoman

            this is for DNS
            Immagine1.jpg
            Immagine2.jpg

            repeat for port 80 and 443 with protocol TCP

            you should end up with something like this

            Immagine3.jpg

            ̿' ̿'\̵͇̿̿\з=(◕_◕)=ε/̵͇̿̿/'̿'̿ ̿
            Please do not use chat/PM to ask for help
            we must focus on silencing this @guest character. we must make up lies and alter the copyrights !
            Don't forget to Upvote with the 👍 button for any post you find to be helpful.

            Y 2 Replies Last reply Reply Quote 1
            • Y
              yodar44 @kiokoman
              last edited by

              @kiokoman
              ok, that fixed it.
              tnx
              is there a manual that covers stuff like this?
              i have Security Gateway Manual, SG-1100 [54pages]
              but it doesn't go into much detail.

              1 Reply Last reply Reply Quote 0
              • kiokomanK
                kiokoman LAYER 8
                last edited by

                almost everything is here https://docs.netgate.com/pfsense/en/latest/
                if something is not clear just ask here, no prob

                ̿' ̿'\̵͇̿̿\з=(◕_◕)=ε/̵͇̿̿/'̿'̿ ̿
                Please do not use chat/PM to ask for help
                we must focus on silencing this @guest character. we must make up lies and alter the copyrights !
                Don't forget to Upvote with the 👍 button for any post you find to be helpful.

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

                  37203ebd-cf5e-4ab9-9a70-0c121c08cbf5-image.png

                  I advise to change UDP for "TCP & UDP" ;)

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

                  1 Reply Last reply Reply Quote 0
                  • Y
                    yodar44 @kiokoman
                    last edited by

                    @kiokoman
                    it looks like i spoke too soon. most sites seem to be working, but not all. some that i haven't been to for a while say: Firefox can’t establish a connection to the server at www... etc. this only happens on the computer on the OPT port.
                    [ i did try Gertjans TCP/UDP suggestion too. no help]
                    this still seems to be a DNS problem. any suggestions?

                    GertjanG 1 Reply Last reply Reply Quote 0
                    • GertjanG
                      Gertjan @yodar44
                      last edited by

                      @yodar44 said in DNS server not responding:

                      any suggestions?

                      Always ;)

                      @yodar44 said in DNS server not responding:

                      seems to be a DNS problem

                      Normally, you can't stay in the "seem" state. Why would you ?
                      When your browser can't connect to 'some. site', you fire up a command prompt, type nslookup + enter and then

                      some.site
                      

                      and enter.
                      It resolves : no DNS issue.
                      It didn't resolve : DNS issue.

                      Example :

                      3eac6de6-6326-4e10-9f41-3ffdbb0d019f-image.png

                      thus www.google.com resolves (for me) to two IP's, and IPv4 and IPv6.

                      As @kiokoman already mentioned above, did you open TCP 80 and TCP 443 ?
                      If not, your browser will not be able to connect to the outside world, because you did not gave him the possibility to do so.

                      During testing, why not open everything on your OPT1 interface with an identical rule as you found on the LAN interface : you'll be sure outgoing connection will succeed, including FTP, SSH, all the mail connections, NTP, etc etc. When this works, you can decide to fine-grain your firewall rules.

                      Example (this is my OpenVPN interface - but is also valid for your OPT1 interface )

                      4bdc24b0-c210-445e-a970-af7a180d729c-image.png

                      Also : because posting images is so easy on this forum - post your OPT1 firewall rules.

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

                      1 Reply Last reply Reply Quote 0
                      • Y
                        yodar44
                        last edited by

                        Screen Shot 10-29-19 at 11.43 AM.JPG

                        Screen Shot 10-29-19 at 11.57 AM.JPG

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

                          This second rule

                          08c05935-4b7b-4851-ad97-971484485ced-image.png

                          should have been :

                          0ad334c1-61f5-455e-96e2-66ec74cff968-image.png

                          You're saved by the fact that the first rule is a "TCP pass all" (so TCP DNS requests to port 53 are handled by this rule).

                          Again, I advise you to put a pass all rule on the fifth position ( IPv4 TCP and UDP ).

                          Btw : did you change any of the DNS Resolver settings ?

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

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

                            Can tell there is something wrong..

                            See where when you do nslookup it comes back unknown for your dns..

                            That is not how it should look..

                            $ nslookup
                            Default Server:  sg4860.local.lan
                            Address:  192.168.9.253
                            
                            

                            This should come back with your pfsense fqdn.. If you can talk to pfsense for dns, dns is actually running on pfsense.. pfsense has to do no lookup at all for that to work.. So this would be basic sanity check.. If that does not come back with pfsnse name.. Then you have connectivity problem, unbound/dnsmasq/bind is not running on pfsense (whatever you are using).. Or there is some wrong with it for sure.

                            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 2.8, 24.11

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

                              @johnpoz said in DNS server not responding:

                              some wrong

                              For sure.
                              Like Resolver (unbound) using ACL - and nothing has been setup for OPT1.
                              Or its forwarding and that setup is faulty.
                              Or .... what ever.
                              It's time @yodar44 starts communicating a bit better as it's DNS ^^

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

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

                                @Gertjan said in DNS server not responding:

                                Or its forwarding and that setup is faulty.

                                Even even forwarding and not working, the name of pfsense should come back when the dns client does the ptr for it.

                                Your ACL suggestion possible yeah.

                                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 2.8, 24.11

                                Y 1 Reply Last reply Reply Quote 0
                                • Y
                                  yodar44 @johnpoz
                                  last edited by

                                  @johnpoz Screen Shot 10-30-19 at 10.08 AM 001.JPG Screen Shot 10-30-19 at 10.08 AM.JPG
                                  i'm attaching screen shots of DNS resolver settings. do you see any thing wrong? i didn't change anything. it is same as it came.

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

                                    what about your acl tab? Did you turn off the auto acl, or did you create your own? But if your acl were not allowing then you wouldn't ever get any answers.

                                    You sure its just not restarting a lot.. Are you running pfblocker, are you doing any attempted dns redirect..

                                    Here is the thing.. When put in the nslookup cmd and you don't get back the name of the dns your pointing to - this is telling you have a problem at basic level, and not just having issues resolving stuff.

                                    Type just nslookup at the cmd line... You should see a name for your pfsense, like you in mine.

                                    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 2.8, 24.11

                                    Y 1 Reply Last reply Reply Quote 0
                                    • Y
                                      yodar44 @johnpoz
                                      last edited by

                                      @johnpoz
                                      the acl tab is blank:
                                      ServicesDNS ResolverAccess Lists
                                      General Settings
                                      Advanced Settings
                                      Access Lists
                                      Access Lists to Control Access to the DNS Resolver

                                      i don't know what pfblocker is.
                                      i didn't intentionally do any dns redirect.
                                      my nslookup:
                                      C:\WINDOWS\system32>nslookup
                                      Default Server: UnKnown
                                      Address: 2001:558:feed::1

                                      how do i set what DNS i am pointing to?

                                      GertjanG 1 Reply Last reply Reply Quote 0
                                      • GertjanG
                                        Gertjan @yodar44
                                        last edited by Gertjan

                                        @yodar44 said in DNS server not responding:

                                        how do i set what DNS i am pointing to?

                                        You said it yourself : your fist post :

                                        @yodar44 said in DNS server not responding:

                                        DNS Servers . . . . . . . . . . . : 10.100.1.1

                                        and just above :

                                        @yodar44 said in DNS server not responding:

                                        Address: 2001:558:feed::1

                                        which is ok for me .... I see the same "IPv6" address :
                                        5b3beecc-3a09-4a66-b264-9ff308a47d99-image.png

                                        Your OPT1 interface and for that matter pfSense is handling / has been set up to handle IPv6 ?
                                        edit : use

                                        ipconfig /all
                                        

                                        to see all the network details of your PC.

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

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

                                          @yodar44 said in DNS server not responding:

                                          how do i set what DNS i am pointing to?

                                          Via your dhcp.. Or directly on your client... What your pointing to there is a IPv6 address for Xfiniity dns..

                                          And that should resolve to
                                          cdns01.comcast.net.

                                          ;; QUESTION SECTION:
                                          ;1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.d.e.e.f.8.5.5.0.1.0.0.2.ip6.arpa. IN PTR
                                          
                                          ;; ANSWER SECTION:
                                          1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.d.e.e.f.8.5.5.0.1.0.0.2.ip6.arpa. 7172 IN PTR cdns01.comcast.net.
                                          

                                          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 2.8, 24.11

                                          Y 1 Reply Last reply Reply Quote 0
                                          • Y
                                            yodar44 @johnpoz
                                            last edited by

                                            @johnpoz
                                            this is my ipconfig/all
                                            Ethernet adapter Ethernet:

                                            Connection-specific DNS Suffix . : localdomain
                                            Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
                                            Physical Address. . . . . . . . . : DC-FE-07-0A-71-0B
                                            DHCP Enabled. . . . . . . . . . . : Yes
                                            Autoconfiguration Enabled . . . . : Yes
                                            IPv6 Address. . . . . . . . . . . : 2601:246:5680:ae30::bea3(Preferred)
                                            Lease Obtained. . . . . . . . . . : Wednesday, October 30, 2019 2:36:37 AM
                                            Lease Expires . . . . . . . . . . : Wednesday, November 6, 2019 2:36:37 AM
                                            Link-local IPv6 Address . . . . . : fe80::d9dd:4d34:3b6a:5c85%22(Preferred)
                                            IPv4 Address. . . . . . . . . . . : 10.100.1.3(Preferred)
                                            Subnet Mask . . . . . . . . . . . : 255.255.255.0
                                            Lease Obtained. . . . . . . . . . : Monday, October 28, 2019 4:16:13 PM
                                            Lease Expires . . . . . . . . . . : Wednesday, October 30, 2019 1:06:38 PM
                                            Default Gateway . . . . . . . . . : 10.100.1.1
                                            DHCP Server . . . . . . . . . . . : 10.100.1.1
                                            DHCPv6 IAID . . . . . . . . . . . : 383581703
                                            DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1E-26-DC-F7-DC-FE-07-0A-71-0B
                                            DNS Servers . . . . . . . . . . . : 2001:558:feed::1
                                            2001:558:feed::2
                                            10.100.1.1
                                            2001:558:feed::1
                                            2001:558:feed::2
                                            NetBIOS over Tcpip. . . . . . . . : Enabled

                                            the only difference between the LAN and OPT is the .1 on OPT vs .10 on LAN
                                            ServicesDHCP ServerOPT: Range 10.100.1.1 From, 10.100.1.254 To
                                            ServicesDHCP ServerLAN: Range 192.168.1.10 From, 192.168.1.245 To

                                            is that significant?

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