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    DNS Resolver problems

    Scheduled Pinned Locked Moved DHCP and DNS
    43 Posts 5 Posters 18.7k Views
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    • johnpozJ
      johnpoz LAYER 8 Global Moderator
      last edited by

      what do you get when you try and resolve it.. Use nslookup, or dig or drill or even the diag lookup page on pfsense.

      Try to ping the name - does it come back with IP or unknown host, etc.

      Let me see if that domain has dnssec enabled that is broken

      edit: I don't show them having dnssec available… But its quite possible your having issue with connectivity to their authoritative servers..

      But I do show their dns to be hosed from online testers

      I show their 1 server for sure not answering

      ;; ANSWER SECTION:
      melita.com.            3600    IN      NS      ns1.melitacable.com.
      melita.com.            3600    IN      NS      ns.melitacable.com.

      ;; ADDITIONAL SECTION:
      ns.melitacable.com.    3600    IN      A      212.56.128.132
      ns1.melitacable.com.    3600    IN      A      212.56.128.196

      so while .196 answers, I can not get a response from .132

      ; <<>> DiG 9.9.5-3ubuntu0.7-Ubuntu <<>> @212.56.128.132 melita.com NS
      ; (1 server found)
      ;; global options: +cmd
      ;; connection timed out; no servers could be reached

      So it would seem they have issues.. Might be connectivity from parts of the world, etc.

      Well now another query works... So they could be having issues.. If your resolving and having problems talking to their NS then yes that could explain why using forwarder works since your just asking for something that a NS already has cached.

      dnsproblems.png
      dnsproblems.png_thumb

      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

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      • C
        Chrismallia
        last edited by

        In the browser I get
        This webpage is not available

        DNS_PROBE_FINISHED_NXDOMAIN

        In pfsense dns lookup I get

        Host must be a valid hostname or IP address.

        In cmd ipconfig I get

        Ping request could not find host http://speedtest.melita.com/speedtest/latency.txt. Please check the name and try again.

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        • johnpozJ
          johnpoz LAYER 8 Global Moderator
          last edited by

          yeah your having issues resolving their dns… you could try a trace in say nslookup or dig.

          But that explains your problem - your having problems resolving that domain..  You could try putting in a host over ride.

          I show that server resolving to.. 212.56.138.60

          So in the resolver create a host override for speedtest with melita.com as domain and that IP.. then see if you can ping by name

          Where I see a major issue is they have a TTL of 100 seconds

          So when they do resolve, it doesn't stay cached long

          ;; ANSWER SECTION:
          speedtest.melita.com.  100    IN      A      212.56.138.60

          ;; AUTHORITY SECTION:
          melita.com.            3600    IN      NS      ns.melitacable.com.
          melita.com.            3600    IN      NS      ns1.melitacable.com.

          ;; ADDITIONAL SECTION:
          ns.melitacable.com.    3600    IN      A      212.56.128.132
          ns1.melitacable.com.    3600    IN      A      212.56.128.196

          Trying to query their servers seems to be hit and miss.. Sometimes it works, and then it fails… So even when you do get it resolved, it only stays cached for 100 seconds.

          If they are your isp you might want to contact them their dns is messed up!!!

          Their SOA is WRONG too...

          ;; QUESTION SECTION:
          ;speedtest.melita.com.          IN      SOA

          ;; AUTHORITY SECTION:
          melita.com.            3561    IN      SOA    helium.melitacable.com. domains.melitacable.com. 2016022500 28800 7200 2419200 86400

          SOA should point to 1 of their name servers..

          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

          1 Reply Last reply Reply Quote 1
          • C
            Chrismallia
            last edited by

            wow your Great so that explains it you should come to Malta and give them a lecture lol ye they are my ISP  that might explane some issues they are having with internet disconnects and slow downs ? everyone is complaining and they say they have no problems lol.  Please how can I donate something to Thank  you for the hole day you spent with me and for all the work?

            1 Reply Last reply Reply Quote 1
            • C
              Chrismallia
              last edited by

              And btw for plex under advance alternative host name I put plex.direct and it is now working great. I can't thank you enough

              1 Reply Last reply Reply Quote 0
              • C
                Chrismallia
                last edited by

                I just gave $20 to free bsd from your link https://www.freebsdfoundation.org/donate/ and have the email to prove it if you would like to see. I also thankt you in the comment  box. Regards friend and thank you again

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

                  No problem - thanks for the donation.. You use to be able to donate direct to pfsense, but this is how they want donations now.

                  I do this for fun, I like tech problems and helping people resolve them.  Getting useful info is normally the hard part.

                  Yeah I would say they are having all kinds of issues.  Is that the dns they hand out to their subscribers?  Or is that just their authoritative dns for their own domain?  When you let pfsense get dns from your isp what IPs do you get?  It doesn't seem to be an open resolver so that is good ;)  I get a refused when try and query say google.com off of them.

                  What I can see as problems is that SOA helium.melitacable.com is not even a valid record in their nameservers.  I see that both the name servers are on the same ASN (same network) looks to be the same class C.  This is BAD IDEA!!!  If problem with that network both nameservers are down..  Most likely they are in the same location too, this is bad - what happens if location has outage?

                  The SOA expire is quite long at 2419200, this should be more like 1 week, 2 weeks tops not 28 days (4 weeks)

                  Doesn't look like their MX accepts mail for postmaster, which is BAD..  And breaks all kinds of rfc's and there isn't even a SPF record.. Some fly by night shitty little ISP to be 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

                  1 Reply Last reply Reply Quote 1
                  • C
                    Chrismallia
                    last edited by

                    Here are the dns I get when I let pfsense use there dns 212.56.129.228 and
                    212.56.132.20  :)
                    Unfortunately  Here in Malta we only have Melita. VODAFONE (4G) and another is GO but GO do not have fiber everywhere yet, :) when you have time is it possible for you to check on GO please? and tell me if they are better. O n speedtest there server are MARSA that by the way speedtest works fine for me when I use there servers :)  and if possible  Vodafone is b'kara. Thanks again for all your help  thanks to you I will choose the better ISP when available

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                    • johnpozJ
                      johnpoz LAYER 8 Global Moderator
                      last edited by

                      well those ns are not open for people to query them when not on that isp… When I try and query them I get refused.  Which is typical setup for ISP name servers.

                      Is this your go site?

                      https://www.go.com.mt

                      They have some issues with their dns as well.. Its not that hard people ;) heheheh

                      They got no glue for 2 of their names servers, they have 4 of them.  They are running old version of Bind on atleast 2 of them.

                      195.38.30.13: "9.3.6-P1-RedHat-9.3.6-25.P1.el5_11.3"

                      That was Deprecated back in like 2009... WTF???

                      They got the same issue where their listed SOA doesn't have record ns1.go.com.nt -- and I show ns1 and ns2 being open you can query them for www.google.com and get an answer..

                      Based solely on their shameful setup of their authoritative name servers for their own freaking domain I would say yeah they have basic lack of technical skill required to run a freaking ISP ;)  But that just me an grumpy old man on the internet that has been doing this for 30 some years ;)

                      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

                      1 Reply Last reply Reply Quote 0
                      • C
                        Chrismallia
                        last edited by

                        loooll yes that go site hehehe wow 1 worse then the other lool. sorry but have you checked the vodafone that is the last one lol? I really love your opinions lool

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