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    DNS Resolver

    2.2 Snapshot Feedback and Problems - RETIRED
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    • M
      mattbunce
      last edited by

      Hi - Sorry to be cheeky, I was wondering if anyone had any idea what might be going wrong in my case when using Domain Overrides to send specific domain queries to a different DNS server. (You can see more in my post above…)

      @mattbunce:

      It seems strange that DNS resolver has identified this as a query that should be sent via the VPN, but it still sends it to the main DNS servers?

      Is anyone else using the Domain Overrides feature and do they also see the requests being sent to the wrong servers before eventually being sent to the correct one?

      Thanks, Matt

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      • H
        Hugovsky
        last edited by

        Sorry to ask again but is there news about my issue reported back in page 6? Or is just misconfiguration I'm doing?

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        • P
          phil.davis
          last edited by

          @mattbunce:

          Hi - Sorry to be cheeky, I was wondering if anyone had any idea what might be going wrong in my case when using Domain Overrides to send specific domain queries to a different DNS server. (You can see more in my post above…)

          @mattbunce:

          It seems strange that DNS resolver has identified this as a query that should be sent via the VPN, but it still sends it to the main DNS servers?

          Is anyone else using the Domain Overrides feature and do they also see the requests being sent to the wrong servers before eventually being sent to the correct one?

          Thanks, Matt

          My system happily sends requests for domain override names just to the specified server.
          In your log, yours is doing that also - server.vpn goes internally.
          But server.vpn.local gets sent externally - you have specified .local as your domain for pfSense/LAN so clients on LAN are getting .local in their DNS suffix searchlist, and trying to append ".local" also when trying name lookups.
          You could also add an override for "local" that points to an internal IP address that does not exist (or to pfSense itself? That might make an interesting loop.) so that anything ending in ".local" does not go to the public DNS.
          DNS Forwarder has an optoin to put "!" instead of an IP address, and requests for that domain are not forwarded anywhere - if the name is not in the local hosts file, then NXDOMAIN is returned. That option is not in DNS Resolver.
          That would be useful to have - I will look in unbound manual and see if it will do it.

          Edit: Add: I think something in the config like:

          local-zone: "local" static

          will tell it that "local." is to be responded to just from pfSense itself - whatever host entries happen to be there that end in ".local" - but non-existent names in ".local" are immediately answered with NXDOMAIN.
          I tried that quickly, in the Advanced box, but unbound is telling me I have a syntax error.
          I also tried

          local-zone "local." redirect

          Still get syntax error message.
          But it looks like it is possible to create an internal zone in unbound that will just return entries it knows about, and NXDOMAIN for things in the zone that it does not know.

          As the Greek philosopher Isosceles used to say, "There are 3 sides to every triangle."
          If I helped you, then help someone else - buy someone a gift from the INF catalog http://secure.inf.org/gifts/usd/

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          • M
            mattbunce
            last edited by

            Thanks Phil

            So do you not have a domain set, and therefore your clients are not applying the suffix?

            In the log I provided, I only did one NSLOOKUP to server.vpn - so either the client sent a second request without the DNS suffix or pfSense dropped the local domain portion after not getting a response from the public DNS servers.

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            • P
              phil.davis
              last edited by

              The client will have tried server.vpn and server.vpn.local on your behalf. So the server sees 2 different requests.
              My pfSenses have their domain as the same as our internal Windows Server AD domain - e.g. internal.mycompany.com - and then a domain override to point internal.mycompany.com to the nearest Active Directory DNS Server.

              Having just 1 internal domain will also resolve the issue you see - at the moment you have a ".vpn" domain and a ".local"domain happening. Then your domain override will be for the domain that pfSense itself is in.

              As the Greek philosopher Isosceles used to say, "There are 3 sides to every triangle."
              If I helped you, then help someone else - buy someone a gift from the INF catalog http://secure.inf.org/gifts/usd/

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              • A
                amunrara
                last edited by

                working fine for me

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                • M
                  mattbunce
                  last edited by

                  Hmm - strange. I have had to use Phil's trick of directing the server.vpn.local requests to a non-existant server and then letting the server.vpn request go to the correct server. Without this I couldn't avoid the public DNS server being queried.

                  Maybe the issue is that I am not using AD? amunrara could you describe your set-up?

                  M

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                  • N
                    nzimmers
                    last edited by

                    I'm a pretty novice user but wanted to provide some feedback and see if there are any suggestions.  I'm currently using 2.2-BETA (i386) built on Thu Dec 04 08:23:23 CST 2014

                    when I check Status->Services  several times in a row I see Unbound DNS Resolver running and stopped at various times so it seems like it's constantly stopping and restarting.

                    in the general setup, I have Allow "DNS server list to be overridden by DHCP/PPP on WAN" unchecked and "Do not use the DNS Forwarder as a DNS server for the firewall" checked.

                    not sure if I have something configured wrong…..

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                    • H
                      Hugovsky
                      last edited by

                      Check the posts near the end of previous page. Might be your issue.

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                      • MikeV7896M
                        MikeV7896
                        last edited by

                        @Hugovsky:

                        Check the posts near the end of previous page. Might be your issue.

                        Specifically, this one…

                        https://forum.pfsense.org/index.php?topic=78356.msg464921#msg464921

                        The S in IOT stands for Security

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                        • X
                          xbipin
                          last edited by

                          i started using the new dns resolver but im having one issue, i have set to reset the pppoe connection ever night so when this happens, unbound stops working, i get these errors in system log continuously

                          Dec 11 09:44:44 	unbound: [7669:0] error: can't bind socket: Can't assign requested address
Dec 11 09:44:44 	unbound: [7669:0] debug: failed address 92.98.234.229 port 61031
Dec 11 09:44:44 	unbound: [7669:0] error: can't bind socket: Can't assign requested address
Dec 11 09:44:44 	unbound: [7669:0] debug: failed address 92.98.234.229 port 19660
Dec 11 09:44:44 	unbound: [7669:0] error: can't bind socket: Can't assign requested address
Dec 11 09:44:44 	unbound: [7669:0] debug: failed address 92.98.234.229 port 26847
Dec 11 09:44:44 	unbound: [7669:0] error: can't bind socket: Can't assign requested address
Dec 11 09:44:44 	unbound: [7669:0] debug: failed address 92.98.234.229 port 26531
Dec 11 09:44:44 	unbound: [7669:0] error: can't bind socket: Can't assign requested address
Dec 11 09:44:44 	unbound: [7669:0] debug: failed address 92.98.234.229 port 65308
Dec 11 09:44:44 	unbound: [7669:0] error: can't bind socket: Can't assign requested address
Dec 11 09:44:44 	unbound: [7669:0] debug: failed address 92.98.234.229 port 19113
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                          • R
                            router_wang
                            last edited by

                            Does the resolver also handle IPv6 dns requests?

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                            • C
                              cmb
                              last edited by

                              @router_wang:

                              Does the resolver also handle IPv6 dns requests?

                              Of course.

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                              • N
                                NobodyHere
                                last edited by

                                We're running the December 10th build. I can confirm issues with a new WAN address breaking unbound. When our PPPoE WAN link gets a new IP address, the resolver will reply with internal IPs set via DHCP clientIDs, but any external DNS lookup made via a system on the LAN fails.

                                DNS resolving on the firewall continues to work, so it's clearly an issue with unbound.

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                                • C
                                  cmb
                                  last edited by

                                  @NobodyHere:

                                  We're running the December 10th build. I can confirm issues with a new WAN address breaking unbound. When our PPPoE WAN link gets a new IP address, the resolver will reply with internal IPs set via DHCP clientIDs, but any external DNS lookup made via a system on the LAN fails.

                                  DNS resolving on the firewall continues to work, so it's clearly an issue with unbound.

                                  https://redmine.pfsense.org/issues/4095

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                                  • N
                                    NobodyHere
                                    last edited by

                                    I'm not sure what a message consisting solely of a link to a similar bug report means…

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                                    • P
                                      phil.davis
                                      last edited by

                                      @NobodyHere:

                                      I'm not sure what a message consisting solely of a link to a similar bug report means…

                                      I think cmb means "it is a known issue and there is a bug report for it".
                                      It does really need fixing - as you have described, DNS resolution can stop working on a WAN DHCP address change, if you have an "unfortunate" combination of Unbound in forwarder mode… settings.

                                      As the Greek philosopher Isosceles used to say, "There are 3 sides to every triangle."
                                      If I helped you, then help someone else - buy someone a gift from the INF catalog http://secure.inf.org/gifts/usd/

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

                                        @phil.davis:

                                        @NobodyHere:

                                        I'm not sure what a message consisting solely of a link to a similar bug report means…

                                        I think cmb means "it is a known issue and there is a bug report for it".

                                        Yes, figured that was clear.

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                                        • D
                                          dstroot
                                          last edited by

                                          Latest version broke unbound for me - it did not start after the upgrade.  I had to uncheck "Enable DNSSEC Support" to get it to come up.

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                                          • J
                                            jbc
                                            last edited by

                                            I have DNS resolver setup to use opendns via dnscrypt-proxy.
                                            I then have firewall rules setup to only allow lan clients to query lan address on port 53,
                                            and block requests to remote DNS'; Everything works in this regard (no dns leaks).

                                            But, if I query an unknown, none existant name, such as qwertyuiopas.dfghjklzxcvbnm
                                            I get:
                                            drill qwertyuiopas.dfghjklzxcvbnm
                                            ;; ->>HEADER<<- opcode: QUERY, rcode: NXDOMAIN, id: 40495
                                            ;; flags: qr rd ra ; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
                                            ;; QUESTION SECTION:
                                            ;; qwertyuiopas.dfghjklzxcvbnm. IN      A

                                            ;; ANSWER SECTION:

                                            ;; AUTHORITY SECTION:
                                            .      2918    IN      SOA    a.root-servers.net. nstld.verisign-grs.com. 2014122700 1800 900 604800 86400

                                            ;; ADDITIONAL SECTION:

                                            ;; Query time: 28 msec
                                            ;; SERVER: 127.0.0.1
                                            ;; WHEN: Sat Dec 27 18:05:03 2014
                                            ;; MSG SIZE  rcvd: 120

                                            And if I ping qwertyuiopas.dfghjklzxcvbnm; It resolves to my WAN ip… (I would expect an unknown host response)

                                            I have "NAT Reflection mode for port forwards" set to Pure NAT, could this be the culprit?

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