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    DNS Resolver problems

    Scheduled Pinned Locked Moved DHCP and DNS
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    • johnpozJ
      johnpoz LAYER 8 Global Moderator
      last edited by

      Lets be clear here, dns has NOTHING to do with the latency of your connection.  It can be a bit slower than just using a resolver because it is talking to the actual authoritative server of the domain, and not just pulling a cached entry from your isp or public dns that has 100 of thousands of queries going to it and more likely than not has what you were looking for cached.

      The authoritative name server for a specific domain might be on the other side of the globe from you.  And you have to find it by walking to down the tree from root.. from . to tld to domain, etc.  So that initial query might be a bit slower than just your plain jane forwarder.  Also resolver is using dnssec out of the box, which the forwarder is not.

      With the resolver you are sure you have full dnssec support and are getting the info from the horses mouth, with a forwarder you have no idea if that IP you looked up is OLD or bad even.. Your just getting what is in the cache of that dns your using.

      Now once the resolver has looked it up, it will cache it and the next time you query it as long as your inside the ttl of that record is will be FAST as anything else you look up from the forwarder that was locally cached.

      This has nothing to do with SSL or latency of your actual connection.

      As to using plex with ssl..  WTF does that have to do with dns??  And sure and the hell pfsense is not going to be doing anything with a https connection any different than any other packets.  Unless your using squid with pfsense??  And trying to do ssl interception??

      I have plex server and use pfsense have no issues at all.  If you point me to this plex thread or give some details of what doesn't work I would be happy to test that.

      As to using forwarder vs resolver - I can tell you if your internet connection is shitty, or your isp is shitty and does dns interception/blocking then yea resolver is not going to be for you.  And your better off using the forwarder.

      But in the big picture using the resolver is much better from a security standpoint than using a forwarder.

      Where you can also have a problem with resolver is if the domain your trying to lookup has broken dnssec - then yeah those lookups will FAIL as they rightfully should.. Where if using the forwarder that is not doing dnssec they would lookup just fine.

      If your stuff is working fine with forwarder, and your happy then there you go end of discussion.  But there is nothing different in the end result with forwarder or resolver when ti comes to looking up something - in the end you look up www.domain.tld you get back an IP..  Those are the exactly the same - its just the security and method of how that actually happens is where there is a difference.  And none of that would have any effect on the speed of your connection or ssl..

      As to not being able to do speedtest - I use the resolver and can tell you for fact that speedtest works just fine..

      If you want to figure out what your actual problem is, please go back to the resolver and post some actual info to what your problem is other than some mention of latency error??  To what speedtest?  Something your ISP has setup??  That maybe only their dns resolves?  What is the FQDN your trying to go to something.domain.tld ???

      And are you trying to connect to your plex remotely with SSL??  Or what exactly?

      An intelligent man is sometimes forced to be drunk to spend time with his fools
      If you get confused: Listen to the Music Play
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      • DerelictD
        Derelict LAYER 8 Netgate
        last edited by

        And if the forwarder works and you decide to stick with it I would try enabling forwarder mode of the resolver instead. Then you'll be using the currently-embraced unbound instead of the on-the-way-out dnsmasq.

        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)

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        • C
          Chrismallia
          last edited by

          @johnpoz:

          Lets be clear here, dns has NOTHING to do with the latency of your connection.  It can be a bit slower than just using a resolver because it is talking to the actual authoritative server of the domain, and not just pulling a cached entry from your isp or public dns that has 100 of thousands of queries going to it and more likely than not has what you were looking for cached.

          The authoritative name server for a specific domain might be on the other side of the globe from you.  And you have to find it by walking to down the tree from root.. from . to tld to domain, etc.  So that initial query might be a bit slower than just your plain jane forwarder.  Also resolver is using dnssec out of the box, which the forwarder is not.

          With the resolver you are sure you have full dnssec support and are getting the info from the horses mouth, with a forwarder you have no idea if that IP you looked up is OLD or bad even.. Your just getting what is in the cache of that dns your using.

          Now once the resolver has looked it up, it will cache it and the next time you query it as long as your inside the ttl of that record is will be FAST as anything else you look up from the forwarder that was locally cached.

          This has nothing to do with SSL or latency of your actual connection.

          As to using plex with ssl..  WTF does that have to do with dns??  And sure and the hell pfsense is not going to be doing anything with a https connection any different than any other packets.  Unless your using squid with pfsense??  And trying to do ssl interception??

          I have plex server and use pfsense have no issues at all.  If you point me to this plex thread or give some details of what doesn't work I would be happy to test that.

          As to using forwarder vs resolver - I can tell you if your internet connection is shitty, or your isp is shitty and does dns interception/blocking then yea resolver is not going to be for you.  And your better off using the forwarder.

          But in the big picture using the resolver is much better from a security standpoint than using a forwarder.

          Where you can also have a problem with resolver is if the domain your trying to lookup has broken dnssec - then yeah those lookups will FAIL as they rightfully should.. Where if using the forwarder that is not doing dnssec they would lookup just fine.

          If your stuff is working fine with forwarder, and your happy then there you go end of discussion.  But there is nothing different in the end result with forwarder or resolver when ti comes to looking up something - in the end you look up www.domain.tld you get back an IP..  Those are the exactly the same - its just the security and method of how that actually happens is where there is a difference.  And none of that would have any effect on the speed of your connection or ssl..

          As to not being able to do speedtest - I use the resolver and can tell you for fact that speedtest works just fine..

          If you want to figure out what your actual problem is, please go back to the resolver and post some actual info to what your problem is other than some mention of latency error??  To what speedtest?  Something your ISP has setup??  That maybe only their dns resolves?  What is the FQDN your trying to go to something.domain.tld ???

          And are you trying to connect to your plex remotely with SSL??  Or what exactly?

          http://forums.sagetv.com/forums/showthread.php?t=62233
          https://forums.plex.tv/discussion/175111/pfsense-plex-secure-plex-web-and-long-delay-at-startup

          here is  the plex problems I am not the only one.  say that it can not be how much you like I know what problems I have I invite any admin for a rdp session and see whats going on. As for speedtest.net yes yes with only the resolver I get the error when I enter a opendns in the dhcp serve the problems go, I have had ddwrt,gargoylr,netgear,Asus and untangle and never had these 2 problems I install pfsense with resolver and I get these 2 problems and you say its from my end? if its from my end how come these problems happen only in pfsense using resolver?

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          • DerelictD
            Derelict LAYER 8 Netgate
            last edited by

            If you're having DNS problems learn to use DNS tools like dig/drill to figure out what's going on.

            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)

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            • C
              Chrismallia
              last edited by

              @Derelict:

              And if the forwarder works and you decide to stick with it I would try enabling forwarder mode of the resolver instead. Then you'll be using the currently-embraced unbound instead of the on-the-way-out dnsmasq.

              Thanks will try it

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              • C
                Chrismallia
                last edited by

                I removed the opendns and tried speed test here is a pic

                Untitled.png
                Untitled.png_thumb

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                • H
                  hda
                  last edited by

                  Your pfSense problems need pictures of:
                  System: General Setup,
                  Services: DNS forwarder,
                  Services: DNS Resolver,
                  Services: DHCP server,
                  and the clienthost IPaddress from where you test the speed. :)

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                  • C
                    Chrismallia
                    last edited by

                    IP 192.168.1.14 AND 192.168.1.2

                    Thanks

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                    • H
                      hda
                      last edited by

                      System: General Setup, you do not need "allow DNS serverlist overridden checked.."
                      Services: DNS Resolver, listening Network interfaces: select only the inside LAN's,

                      Both the clients have received a DHCP-lease, with DNS 127.0.0.1/192.168.1.1 right ? (So no static with own public DNS)
                      You have allowed firewall LAN all outgoing ? (at least you want [IPv4 TCP/UDP LAN net * This Firewall 53 (DNS)] )

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                      • johnpozJ
                        johnpoz LAYER 8 Global Moderator
                        last edited by

                        That plex issue with secure plex sure seems to be rebinding protection.. Not DNS exactly..  Yeah public domains shouldn't resolve to rfc1918 address space..

                        So you could make an exception
                        server:
                        private-domain: "example.com"

                        For the domain your trying to hit, or you could just use a host override to point whatever your accessing outside locally so its not public lookup that returns rfc1918

                        Forwarder does rebinding protection as well you would need something like
                        rebind-domain-ok=/mydomain.com/

                        https://doc.pfsense.org/index.php/DNS_Rebinding_Protections

                        In the advanced section of the forwarder to allow your domain to return private IP space.  or you could just turn off rebinding protection.  How exactly are you trying to access plex??

                        More than likely your shitty off the shelf routers not going to provide rebinding protection. As to your speedtest… What is the url your using to access that speedtest??

                        Me personally I don't access my plex from outside other than with vpn..  Clickity Clickity on my vpn network, click open plex app on phone or ipad there you go.. Same goes for any computer, I just vpn in and hit the web page of my plex server.

                        rebind.png
                        rebind.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 2.7.2, 24.11

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                        • C
                          Chrismallia
                          last edited by

                          HI johnpoz

                          You are 100 percent right, the plex problem was the rebinding and ye lol you where again right shitty routers do not have dns rebinding protection and looks like untangle does not have it  also so A++ to pfsense  :P, I use the phone app or some users use the web browser to access plex, the problem seams to be in using browser but hey it is not worth loosing rebinding protection over it It makes much more sence as you say to use VPN. As for the speedtest I go to speedtest.net and choose my ISP server Madlina, strange part is if i user speedtest.net and select a different server other then my isp it works, and when I specify a public dns in dhcp server madlina works, I turned of dns overwrite in general setup but still same problem

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                          • C
                            Chrismallia
                            last edited by

                            @hda:

                            System: General Setup, you do not need "allow DNS serverlist overridden checked.."
                            Services: DNS Resolver, listening Network interfaces: select only the inside LAN's,

                            Both the clients have received a DHCP-lease, with DNS 127.0.0.1/192.168.1.1 right ? (So no static with own public DNS)
                            You have allowed firewall LAN all outgoing ? (at least you want [IPv4 TCP/UDP LAN net * This Firewall 53 (DNS)] )

                            Hi I removed the overwrite in general
                            2 the 192.168.1.2 has a static dhcp set in the pfsense dhcp
                            3 resolver listining interface I can not select LAN on its own I get
                            The following input errors were detected:

                            This system is configured to use the DNS Resolver as its DNS server, so Localhost or All must be selected in Network Interfaces.
                            when I select local host I do ot get dns

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                            • H
                              hda
                              last edited by

                              @Chrismallia:

                              resolver listining interface I can not select LAN on its own I get
                              The following input errors were detected:

                              This system is configured to use the DNS Resolver as its DNS server, so Localhost or All must be selected in Network Interfaces.
                              when I select local host I do ot get dns

                              Correct, I forgot to point for Localhost too. Use Ctrl+mouseclick to select LAN(s) and Localhost. (But 'All' should work OK)

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                              • C
                                Chrismallia
                                last edited by

                                @hda:

                                @Chrismallia:

                                resolver listining interface I can not select LAN on its own I get
                                The following input errors were detected:

                                This system is configured to use the DNS Resolver as its DNS server, so Localhost or All must be selected in Network Interfaces.
                                when I select local host I do ot get dns

                                Correct, I forgot to point for Localhost too. Use Ctrl+mouseclick to select LAN(s) and Localhost. (But 'All' should work OK)

                                here are the pic same problem

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                                • H
                                  hda
                                  last edited by

                                  Then to me it looks like DNSSEC-support problem at test-site.
                                  You could test this with unchecking DNSSEC support. But not recommended for the ultimate Resolver use ;)

                                  N.B. There is another tough criterium, see Services: DNS Resolver: Advanced (Harden DNSSEC data).

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                                  • C
                                    Chrismallia
                                    last edited by

                                    @hda:

                                    Then to me it looks like DNSSEC-support problem at test-site.
                                    You could test this with unchecking DNSSEC support. But not recommended for the ultimate Resolver use ;)

                                    N.B. There is another tough criterium, see Services: DNS Resolver: Advanced (Harden DNSSEC data).

                                    Hi unchecked both but same problem. lol its a mystery

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                                    • johnpozJ
                                      johnpoz LAYER 8 Global Moderator
                                      last edited by

                                      How do you pick "Madlina"

                                      in speedtest?  I want to look to what IP/FQDN your testing too..

                                      What city are you using that allows you to select Madlina?  Can you post a screen shot showing you picking this - see example below

                                      2016-03-08_091648.png
                                      2016-03-08_091648.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 2.7.2, 24.11

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                                      • C
                                        Chrismallia
                                        last edited by

                                        Hi I am from Malta so in Malta and Madlina is where my isp servers are Melita plc

                                        madlina.png
                                        madlina.png_thumb

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                                        • johnpozJ
                                          johnpoz LAYER 8 Global Moderator
                                          last edited by

                                          Ok I am using resolver and have no issues testing to that server.

                                          I would suggest you do a sniff on your machine when you try and test to that server, vs when you test to a server that works.  Or even easier enable debug..  So click on your map before you start test and type debug and you should get a window - see attached… What errors/info do you get in there?

                                          enabledebug.png
                                          enabledebug.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 2.7.2, 24.11

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                                          • C
                                            Chrismallia
                                            last edited by

                                            @johnpoz:

                                            Ok I am using resolver and have no issues testing to that server.

                                            I would suggest you do a sniff on your machine when you try and test to that server, vs when you test to a server that works

                                            No idea I installed pfsense on a different pc and same results it only works when I use public dns.  sorry what do you mean by doing a sniff?

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