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    DNS Resolver

    2.2 Snapshot Feedback and Problems - RETIRED
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    • E
      Escorpiom
      last edited by

      I'm sorry to say that Unbound in 2.2 beta has (still) issues:

      Nov 12 18:21:42	unbound: [94783:0] notice: Restart of unbound 1.4.22.
Nov 12 18:21:42	unbound: [94783:0] warning: too many file descriptors requested. The builtinmini-event cannot handle more than 1024\. Config for less fds or compile with libevent
Nov 12 18:21:42	unbound: [94783:0] warning: continuing with less udp ports: 91

      I've seen this a couple of times here, but no solution was found.
      From what can be found on the web, it seems to be a problem with multicore cpu's (mine's a 2558 SOC).
      The "Number of queries per thread" in the web interface shows 512, but in the actual config file it's still set at 1024.

      The value should sit around 250 for a 4-core cpu, not exceeding a total of 1024.
      Manually adjusting the Unbound config is no use, after saving a change in the admin interface, it resets to 1024 again.

      This issue is causing Unbound to restart and when it does, delays the DNS lookups.
      Old bug that really need to be fixed.

      Cheers.

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      • H
        Hugovsky
        last edited by

        Seems some options are not parsed to the config file. I've already posted about the advanced field, but I've found another:

        2.2-BETA (amd64)
        built on Thu Nov 13 06:05:47 CST 2014
        FreeBSD 10.1-RELEASE

        check in the config file below and check the pic:

        /var/unbound: cat unbound.conf
        ##########################

        Unbound Configuration

        ##########################

        Server configuration

        server:
        chroot: /var/unbound
        username: "unbound"
        directory: "/var/unbound"
        pidfile: "/var/run/unbound.pid"
        use-syslog: yes
        port: 53
        verbosity: 1
        harden-referral-path: no
        do-ip4: yes
        do-ip6: yes
        do-udp: yes
        do-tcp: yes
        do-daemonize: yes
        module-config: "validator iterator"
        unwanted-reply-threshold: 0
        num-queries-per-thread: 1024
        jostle-timeout: 200
        infra-host-ttl: 900
        infra-lame-ttl: 900
        infra-cache-numhosts: 10000
        outgoing-num-tcp: 10
        incoming-num-tcp: 10
        edns-buffer-size: 4096
        cache-max-ttl: 86400
        cache-min-ttl: 0
        harden-dnssec-stripped: yes
        num-threads: 2
        msg-cache-slabs: 4
        rrset-cache-slabs: 4
        infra-cache-slabs: 4
        key-cache-slabs: 4
        msg-cache-size: 4m
        rrset-cache-size: 8m
        outgoing-range: 462
        #so-rcvbuf: 4m
        auto-trust-anchor-file: /var/unbound/root.key
        prefetch: no
        prefetch-key: no

        Statistics

        Unbound Statistics

        statistics-interval: 0
        extended-statistics: yes
        statistics-cumulative: yes

        Interface IP(s) to bind to

        interface: 192.168.50.1
        interface: 10.1.2.1
        interface: 192.168.51.1
        interface: 127.0.0.1
        interface: ::1

        Outgoing interfaces to be used

        outgoing-interface: #####
        outgoing-interface: #####

        DNS Rebinding

        For DNS Rebinding prevention

        private-address: 10.0.0.0/8
        private-address: 172.16.0.0/12
        private-address: 192.168.0.0/16
        private-address: 192.254.0.0/16
        private-address: fd00::/8
        private-address: fe80::/10

        Set private domains in case authoritative name server returns a Private IP address

        private-domain: "hsnetworks"
        domain-insecure: "hsnetworks"

        Access lists

        include: /var/unbound/access_lists.conf

        Static host entries

        include: /var/unbound/host_entries.conf

        Domain overrides

        include: /var/unbound/domainoverrides.conf

        Remote Control Config

        include: /var/unbound/remotecontrol.conf

        (edited to include snapshot version)

        general.jpg
        general.jpg_thumb
        advanced.jpg
        advanced.jpg_thumb

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        • H
          Hugovsky
          last edited by

          More info on this:

          although the config file of unbound doesn't have it, config.xml does have the right settings:

          <custom_options>include:/var/unbound/local-blocking-data.conf</custom_options>
          <dnssec><prefetch><prefetchkey><msgcachesize>4</msgcachesize>
          <outgoing_num_tcp>0</outgoing_num_tcp>
          <incoming_num_tcp>0</incoming_num_tcp>
          <edns_buffer_size>1480</edns_buffer_size>
          <num_queries_per_thread>512</num_queries_per_thread>
          <jostle_timeout>100</jostle_timeout></prefetchkey></prefetch></dnssec>

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          • P
            phil.davis
            last edited by

            The code in /etc/inc/unbound.inc simply does not implement the settings into the conf file.
            I am looking at this. It will be easy to finish the implementation - pull request in 1 hour hopefully.

            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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            • P
              phil.davis
              last edited by

              Pull request: https://github.com/pfsense/pfsense/pull/1336

              That makes it implement all the parameters that can be specified in the "Advanced" section (the custom options box) and on the "Advanced" tab. unbound.conf has all this stuff now after pressing Apply.

              And it took me 72 minutes between posts - there were a few little extra bits to think about, software project estimation is never an exact science, and I actually tested it also  ;)

              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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              • H
                Hugovsky
                last edited by

                Thanks again for being so fast. I'll test it and report back.

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                • H
                  Hugovsky
                  last edited by

                  It's working perfectly on the latest snapshot. Thanks again. Although, I was reading unbound docs and noticed this:

                  "FILE FORMAT
                        There  must be whitespace between keywords. Attribute keywords end with a colon ':'. An attribute is followed by its containing attributes, or a value."

                  Text parsed in the advanced field breaks the line with spaces. Do you think this is important?

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                  • E
                    Escorpiom
                    last edited by

                    Phil and Hugovsky, thanks for following up on this. I know it's community so it's awesome you helped out with this.
                    Will test it shortly.

                    Cheers.

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                    • A
                      athurdent
                      last edited by

                      @athurdent:

                      I'm using CARP virtual IPs and run Unbound on "All" interfaces.
                      If I query the CARP IP from a Linux box, I get this:

                      root@none:~# dig @192.168.xxx.254 www.heise.de
;; reply from unexpected source: 192.168.xxx.5#53, expected 192.168.xxx.254#53
;; reply from unexpected source: 192.168.xxx.5#53, expected 192.168.xxx.254#53
;; reply from unexpected source: 192.168.xxx.5#53, expected 192.168.xxx.254#53

                      Snapshot is AMD64 from today.

                      I took another look at this:

                      IP aliases can be explicitly chosen in the GUI but do not appear in unbound.conf so this does not help with the problem. Seems like a bug and should be fixed I guess.

                      If you set

                      interface-automatic: yes

                      then it replies properly when doing a dig@ the alias IP.
                      This feature is marked experimental though, I don't know the downsides.

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                      • P
                        p1erre
                        last edited by

                        Hi

                        I've another issue, all my DHCP6 static bindings are not included in /var/unbound/host_entries.conf. It shows only the IPv4 entries.

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                        • ?
                          Guest
                          last edited by

                          file a bug.

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                          • P
                            p1erre
                            last edited by

                            @gonzopancho:

                            file a bug.

                            Bug #4013

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                            • C
                              cmb
                              last edited by

                              Most things should be fixed here now. Open DNS Resolver bug tickets can be viewed here:
                              https://redmine.pfsense.org/projects/pfsense/issues?query_id=42

                              if you notice anything not on the list, please post here on this board, either in this thread or start your own. If you have a clearly-defined bug report, open a ticket at redmine.pfsense.org. If you're not sure the specific issue, it's best to discuss here first, where someone can help quantify the issue.

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                              • A
                                athurdent
                                last edited by

                                Does not seem to work properly with IP Aliases or CARP interfaces here. IP Aliases don't work at all, CARP virtual IPs create an interface entry with "Array" and unbound fails to start.

                                To reproduce:
                                -create an IP Alias
                                -choose it as the only Network interface in Unbound
                                Result in /var/unbound/unbound.conf

                                # Interface IP(s) to bind to

                                Or:
                                -create a CARP virtual IP
                                -choose it as the only Network interface in Unbound
                                Result in /var/unbound/unbound.conf

                                # Interface IP(s) to bind to
interface: 192.168.xxx.6
interface: Array

                                I'm testing on the latest:

                                2.2-BETA (amd64) 
built on Mon Nov 17 19:31:46 CST 2014 
FreeBSD 10.1-RELEASE
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                                • P
                                  phil.davis
                                  last edited by

                                  cmb fixed that "Array" thing with very recent commit https://github.com/pfsense/pfsense/commit/845fd268c94e3c4de31700ce29963038e28fa017
                                  But I suspect that now you might just get no binding.
                                  You could install the latest /etc/inc/unbound.inc and then report back what remains wrong.

                                  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
                                    athurdent
                                    last edited by

                                    Thanks Phil!
                                    CARP seems to work Ok now, also verified that it can be queried with dig@.
                                    An IP alias still behaves as described above.

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                                    • D
                                      dstroot
                                      last edited by

                                      Used to do this with dnsmasq:

                                      Insert the following into the “Advanced” text area field on the DNS Forwarder page in pfSense:  bogus-nxdomain=92.242.140.2

                                      This stopped my ISP from hijacking DNS.

                                      Doesn't seem to work with unbound.  Is there an equivalent command?  If I put it in the unbound advanced box unbound dies.

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                                      • C
                                        cmb
                                        last edited by

                                        I don't see an equivalent to that with Unbound. Though if you have Unbound doing its own recursion (don't enable forwarding mode), you should never see that from your ISP.

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                                        • D
                                          dstroot
                                          last edited by

                                          @CMB - thanks for the swift response.  I know you are working at banging out 2.2.

                                          Can you elaborate what "forwarding mode" does for unbound?  I want unbound to cache DNS queries and be the DNS server for my LAN.  I was under the impression I needed it on so unbound would be a cache server and "forward" the results of my main DNS servers (for example say 8.8.8.8).

                                          BTW I did turn forwarding off to see what happens and the DNS hijacking stopped.  Thx for that tip!

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                                          • P
                                            phil.davis
                                            last edited by

                                            Forwarding mode means it will just send queries (for domains not already in the cache) directly upstream to the defined upstream DNS server/s it has been told about.
                                            With recursion, unbound does its queries directly through the chain of internet root servers down to the authoritative server for the requested domain, thus avoiding using some intermediate upstream DNS and its cache, but keeps a cache for itself.
                                            http://en.wikipedia.org/wiki/Domain_Name_System#Recursive_and_caching_name_server

                                            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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