• Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Search
  • Register
  • Login
Netgate Discussion Forum
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Search
  • Register
  • Login

Having a hell of a time with DNS Resolver and Domain / Host Overrides

Scheduled Pinned Locked Moved DHCP and DNS
8 Posts 4 Posters 1.0k Views
Loading More Posts
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • P Offline
    ProxyMoron
    last edited by Aug 25, 2017, 4:14 PM Aug 25, 2017, 4:06 PM

    Firstly, johnpoz - i tried man - i really tried - been at this for hours.  ;D

    So i have a Windows Server on my LAN configured to provide DNS for Windows Machines on a domain test.com.

    That then points to pfSense as a forwarder to resolve queries it doesn't know and this all works a treat.

    In pfsense i have set up the domain as test.com in the General Setup, with NO DNS servers configured.

    In the DNS resolver, i have it turned on, (Forwarder is off BTY) - listening only on interfaces i need (LAN, DMZ etc) and outgoing on LAN (idea being for the Windows Server to be contactable from other Interfaces), WAN and localhost.

    DNSSEC is ticked and thats pretty much it (Enable Forwarding Mode is OFF) so im using the root servers.

    So i have a homeserver at homeserver.test.com that i would like pfsense to be able to resolve. So in DNS overrides, i configured test.com and point that to my internal Windows Server on the LAN.

    If i then nslookup from a PC, with the default of the windows server selected and a DNS prefix of test.com, and lookup homeserver - i get the correct IP of the server.

    In nslookup if i then change to "server <pfsense ip="">" and then do homeserver i get a response from a root server, which means test.com lookups are leaking.

    So it appears to be ignoring anything i put in the override for test.com. A wireshark trace shows a DNS query going to pfsense with homeserver.test.com and a response of A or AAAA homeserver.test.com no such name.

    I have also tried specifically setting a host override of homeserver and test.com to the proper IP with no joy.

    The really weird thing here is that from pfSense, if i do an DNS lookup it resolves correctly too.

    Can anyone point me in the right direction here?</pfsense>

    1 Reply Last reply Reply Quote 0
    • J Offline
      johnpoz LAYER 8 Global Moderator
      last edited by Aug 25, 2017, 6:35 PM

      "and then do homeserver i get a response from a root server, which means test.com lookups are leaking."

      No it doesn't..  Your lookup should be homeserver.test.com

      If it was going to the public internet you would get an answer

      ;; QUESTION SECTION:
      ;homeserver.test.com.          IN      A

      ;; ANSWER SECTION:
      homeserver.test.com.    3600    IN      A      69.172.200.109

      ;; Query time: 72 msec
      ;; SERVER: 127.0.0.1#53(127.0.0.1)
      ;; WHEN: Fri Aug 25 13:26:25 CDT 2017
      ;; MSG SIZE  rcvd: 64

      "I have also tried specifically setting a host override of homeserver and test.com to the proper IP with no joy."

      My guess is you put the in the WRONG place.. ie the forwarder vs the resolver, etc.  Or the resolver never actually took the setting.

      Creating a host override for anything takes all of .2 seconds to do.. See attached.. Without picture I can not tell where your going wrong..  If you can not get this to work, or getting SOA for looking up homeserver.test.com – when this resolves on the public internet then you got something wrong yes.

      override.png
      override.png_thumb
      before-after.png
      before-after.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 25.07 | Lab VMs 2.8, 25.07

      1 Reply Last reply Reply Quote 0
      • J Offline
        JuantonJohn
        last edited by Aug 25, 2017, 8:50 PM

        To add to JohnPoz - To be thorough; do a ipconfig renew and ipconfig /flushdns - and restart the DNS Resolver services on pfSense.

        1 Reply Last reply Reply Quote 0
        • P Offline
          ProxyMoron
          last edited by Aug 25, 2017, 9:50 PM

          @johnpoz:

          "and then do homeserver i get a response from a root server, which means test.com lookups are leaking."

          No it doesn't..  Your lookup should be homeserver.test.com

          If it was going to the public internet you would get an answer

          ;; QUESTION SECTION:
          ;homeserver.test.com.          IN      A

          ;; ANSWER SECTION:
          homeserver.test.com.    3600    IN      A      69.172.200.109

          ;; Query time: 72 msec
          ;; SERVER: 127.0.0.1#53(127.0.0.1)
          ;; WHEN: Fri Aug 25 13:26:25 CDT 2017
          ;; MSG SIZE  rcvd: 64

          "I have also tried specifically setting a host override of homeserver and test.com to the proper IP with no joy."

          My guess is you put the in the WRONG place.. ie the forwarder vs the resolver, etc.  Or the resolver never actually took the setting.

          Creating a host override for anything takes all of .2 seconds to do.. See attached.. Without picture I can not tell where your going wrong..  If you can not get this to work, or getting SOA for looking up homeserver.test.com – when this resolves on the public internet then you got something wrong yes.

          Ok,
            Your right it should be homeserver.test.com - but with nslookup / DNS on windows there is a DNS suffix - in my case test.com - which is appended to my queries like "homeserver" automagically - confirmed with wireshark e.g, if i was to query homeserver.test.com it would actually be looking for homeserver.test.com.test.com.

          Wireless LAN adapter WiFi:

          Connection-specific DNS Suffix  . : test.com

          So pfSense gets homeserver.test.com as the DNS name requested and i DO end up with a root server response

          PS C:\WINDOWS\system32> nslookup
          Default Server:  UnKnown
          Address:  192.168.1.10  –- Windows Server DNS on LAN

          homeserver
          Server:  UnKnown
          Address:  192.168.1.10

          Name:    homeserver.test.com  -- note the test.com suffix
          Address:  192.168.1.8

          server 192.168.1.1 -- change to pfSense box
          Default Server:  [192.168.1.1]
          Address:  192.168.1.1

          homeserver
          Server:  [192.168.1.1]
          Address:  192.168.1.1

          Non-authoritative answer:
          Name:    homeserver.com – actually resolves to a popular site - i am changing these responses for privacy though
          Address:  62.xx.xx.xxx

          I am defiantly doing this in the resolver - the forwarder is disabled.

          Finally - JuantonJohn - i dont need to flush the DNS cache on the clients as im directly querying the servers every time with the nslookup.

          What is confusing me here is that DNS lookup on the pfsense box itself returns the correct result.

          1 Reply Last reply Reply Quote 0
          • D Offline
            Derelict LAYER 8 Netgate
            last edited by Aug 26, 2017, 12:44 AM

            You need to make the client you are testing from use the correct default domain suffixes. It needs to specifically ask for homeserver.test.com.

            What does 192.168.1.1 return when asked to resolve homeserver.test.com. ??

            Note: windows nslookup sucks. Use something with dig or drill.

            See Also: DNS Suffix Search List in ipconfig /all.

            Chattanooga, Tennessee, USA
            A comprehensive network diagram is worth 10,000 words and 15 conference calls.
            DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
            Do Not Chat For Help! NO_WAN_EGRESS(TM)

            1 Reply Last reply Reply Quote 0
            • J Offline
              johnpoz LAYER 8 Global Moderator
              last edited by Aug 26, 2017, 9:16 AM Aug 26, 2017, 9:10 AM

              homeserver
              Server:  [192.168.1.1]
              Address:  192.168.1.1

              this is NOT a valid query via nslookup if looking for homeserver.test.com

              when you are wanting to do a query direct you should make sure you end fqdn with a . so that you don't get stuff appended with nslookup… It really is almost horrific to work with.  One of the first things I install on any windows machine I have to use is dig..  Its FREE and installs in seconds.. Just grab it from https://www.isc.org/downloads/  click on bind and then grab what version you want, just install the tools when you run the install or you end up with a full bind install ;)  I normally use the ED version..

              That you get this
              Default Server:  [192.168.1.1]
              Address:  192.168.1.1

              Vs the name via the PTR your client should do - see mine comes back pfsense.local.lan tells me you got something jacked…

              nslookup.png
              nslookup.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 25.07 | Lab VMs 2.8, 25.07

              1 Reply Last reply Reply Quote 0
              • P Offline
                ProxyMoron
                last edited by Aug 26, 2017, 10:11 AM

                Thanks folks,
                  I think i've managed to locate the issue, i had a NAT rule setup incorrectly which was redirecting my DNS traffic in a way i did not intend it too.

                I spent way too long on this, even went as far as renaming my internal domain away from a .local to my test.com (which i needed to do anyway as its bad practice.)

                Apologies for wasting your time here.

                1 Reply Last reply Reply Quote 0
                • J Offline
                  JuantonJohn
                  last edited by Aug 26, 2017, 5:03 PM

                  @ProxyMoron:

                  I spent way too long on this,…

                  This is how you learn.  When you're comfortable, you can help others out on here, pay it forward.
                  I can't fathom the number of hours I spent building and breaking stuff in pfSense and in my homelab network(s)!!

                  1 Reply Last reply Reply Quote 0
                  8 out of 8
                  • First post
                    8/8
                    Last post
                  Copyright 2025 Rubicon Communications LLC (Netgate). All rights reserved.
                    This community forum collects and processes your personal information.
                    consent.not_received