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[RESOLVED]No internet on ubuntu when disable dhcp

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  • J
    johnpoz LAYER 8 Global Moderator @Farisse
    last edited by Jul 12, 2020, 12:30 PM

    @Farisse said in No internet on ubuntu when disable dhcp:

    My firewall rules are empty (or everything is open)

    If your firewall rules are EMPTY then everything is blocked!

    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
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    F 1 Reply Last reply Jul 12, 2020, 12:46 PM Reply Quote 0
    • F
      Farisse @johnpoz
      last edited by Jul 12, 2020, 12:46 PM

      @johnpoz No sorry I mean everything is open 74ea0f9a-a7ef-4ac7-bcc2-c1b7bf11f7ec-image.png

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      • J
        johnpoz LAYER 8 Global Moderator
        last edited by johnpoz Jul 12, 2020, 12:49 PM Jul 12, 2020, 12:47 PM

        And clearly you have 13 states currently open using that rule, and have moved 63.18 MB of traffic.

        How about some actual info... Lets see you ping the DMZ address from this client.. Lets see you do a dns query to what the dmz address, some other dns server?

        Lets see the ifconfig output from this client. When you say it doesn't work, and then when you say it works if you turn on dhcp on pfsense.

        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

        F 1 Reply Last reply Jul 12, 2020, 1:02 PM Reply Quote 0
        • F
          Farisse @johnpoz
          last edited by Jul 12, 2020, 1:02 PM

          @johnpoz said in No internet on ubuntu when disable dhcp:

          How about some actual info... Lets see you ping the DMZ address from this client.. Lets see you do a dns query to what the dmz address, some other dns server?
          Lets see the ifconfig output from this client. When you say it doesn't work, and then when you say it works if you turn on dhcp on pfsense.

          i am not sure about understanding the questions do you mean that i show the results of the commands you said ?

          There are 2 dns servers. One one the schools network and the other in my lan network.

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          • J
            johnpoz LAYER 8 Global Moderator
            last edited by johnpoz Jul 12, 2020, 1:09 PM Jul 12, 2020, 1:05 PM

            Yes lets see the output of the commands.. Not just you saying something doesn't work via what a browser? ping pfsense dmz address, if you can't then your never getting anywhere.. If you can not query dns then your never going to get anywhere via fqdn.

            Lets see say a traceroute when it works, and when it doesn't work to both an IP say 8.8.8.8 and then say via a fqdn like www.google.com

            Your not doing something like static arps are you in pfsense?

            If you setup a static arp say for 1.2.3.4 mac xyz so that what the client gets when dhcp is on, and then you setup IP on the machine to be 1.2.3.5 then no it wouldn't work.

            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

            F 1 Reply Last reply Jul 12, 2020, 1:17 PM Reply Quote 0
            • F
              Farisse @johnpoz
              last edited by Farisse Jul 12, 2020, 1:30 PM Jul 12, 2020, 1:17 PM

              @johnpoz
              the video is uploading i'll add screenshots in a few minutes
              https://streamable.com/j30bzs

              Ping from Windows Hyper-v to DMZ network 455fbd6a-2e49-4aca-9c16-51e06309c41e-image.png

              Ping from Ubuntu to DNS/DMZ network + ifconfig
              41793422-93b4-41ea-b546-d88f9cc70877-image.png

              Do you need more info ?

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              • J
                johnpoz LAYER 8 Global Moderator
                last edited by Jul 12, 2020, 2:05 PM

                And that is with dhcp or static? And where is your dns query?

                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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                • F
                  Farisse
                  last edited by Farisse Jul 12, 2020, 2:17 PM Jul 12, 2020, 2:17 PM

                  This is Static the video is when internet was functional and then after reboot ... nothing anymore

                  here is the dns query:
                  c3cd78d9-8c96-438e-890e-4835863518f0-image.png

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                  • J
                    johnpoz LAYER 8 Global Moderator
                    last edited by johnpoz Jul 12, 2020, 3:53 PM Jul 12, 2020, 3:45 PM

                    Well not really possible to use the internet without dns resolution..

                    What server are you trying to query - can not tell from that command..

                    Do a dig with with @ipaddress of dns server.

                    something like dig @192.168.1.1 www.google.com

                    your command is just going to ask some dns server, which don't know what that is for 192.168.1.1

                    Is pfsense listening on dmz interface for dns? Are you pointing dns to something else?

                    how about this output

                    networkctl status
                    ●        State: routable
                           Address: 192.168.2.12 on ens3
                                    fe80::11:32ff:fe22:cc7d on ens3
                           Gateway: 192.168.2.253 (ADI Engineering, Inc.) on ens3
                               DNS: 192.168.3.10
                    Search Domains: local.lan
                               NTP: 192.168.3.32
                                    192.168.2.253
                    

                    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

                    F 1 Reply Last reply Jul 12, 2020, 4:02 PM Reply Quote 0
                    • F
                      Farisse @johnpoz
                      last edited by Jul 12, 2020, 4:02 PM

                      @johnpoz Well i didn't change anything and i have an internet connection again.

                      maybe extra information :
                      I use an external DNS in pfsense
                      25f8f886-96b7-48a5-ad05-9bf473fc797e-image.png

                      As from now i have internet this is the requested command :
                      2e919bed-ce19-4c6b-a4c7-be3a8079fe0c-image.png

                      cdea2864-c329-4214-bd3d-60812506f9b0-image.png

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                      • J
                        johnpoz LAYER 8 Global Moderator
                        last edited by Jul 12, 2020, 5:16 PM

                        Well from your output of nteworkctl you have NO DNS set..

                        Unless you setup forwarding on pfsense, those dns servers don't do anything other what pfsense itself would use for dns.

                        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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                        • F
                          Farisse
                          last edited by Jul 12, 2020, 5:37 PM

                          The DNS forwarder is indeed enabled in pfsense and dns resolver to. Does it make any change if i configure the dns on a client machine ?

                          And why do i get internet for a few time then no more internet and after a few time back again without changing nothing ?

                          J 1 Reply Last reply Jul 12, 2020, 6:07 PM Reply Quote 0
                          • J
                            johnpoz LAYER 8 Global Moderator
                            last edited by Jul 12, 2020, 6:06 PM

                            My "guess" would be when your on dhcp you cache some records..

                            Clearly from what you posted you have no dns set.. So NO internet is never going to work - unless you plan on just using IPs only ;)

                            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
                            • J
                              johnpoz LAYER 8 Global Moderator @Farisse
                              last edited by johnpoz Jul 12, 2020, 6:08 PM Jul 12, 2020, 6:07 PM

                              @Farisse said in No internet on ubuntu when disable dhcp:

                              The DNS forwarder is indeed enabled in pfsense and dns resolver to

                              Well that is just borked! You mean you have unbound fowarding? Running both forward (dnsmasq) and resolver unbound is going to be problematic for sure.. Unless you have 1 running on different port than 53.

                              from your directed query to 192.168.1.1 you resolved google - so set your ubuntu to use that for its dns when you run static.

                              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

                              F 1 Reply Last reply Jul 12, 2020, 7:51 PM Reply Quote 0
                              • F
                                Farisse
                                last edited by Jul 12, 2020, 7:49 PM

                                They are on two different ports
                                92a0187a-0d46-47c6-81eb-425c49f9b715-image.png
                                90899a5d-f29b-4944-bfaa-6c614e19fe02-image.png

                                I should normally not have any problem with that ? Except maybe my other dns server who is in my lan that i use with freeradius on my guest network ?

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                                • F
                                  Farisse @johnpoz
                                  last edited by Jul 12, 2020, 7:51 PM

                                  @johnpoz said in No internet on ubuntu when disable dhcp:

                                  from your directed query to 192.168.1.1 you resolved google - so set your ubuntu to use that for its dns when you run static.

                                  What do you mean with this ? I thought i already configures my ubuntu for using a dns ?
                                  c6e5b648-ab3c-49db-9213-05f9dfa9cf4d-image.png
                                  286efefb-6daa-4f00-af26-9316acdd2e85-image.png

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                                  • J
                                    johnpoz LAYER 8 Global Moderator
                                    last edited by johnpoz Jul 12, 2020, 8:16 PM Jul 12, 2020, 8:09 PM

                                    Well clearly not using that now is it..

                                    When you directed to do dns it work @192.168.1.1

                                    When you just do dig, its saying it can not talk to dns.

                                    when you look with networkctrl status - does it show you dns.. NO... And its not working, so clearly its NOT SET!! if it was, then it would be using it and working...

                                    what does nslookup show you?

                                    user@NewUC:~$ nslookup www.google.com
                                    Server:         127.0.0.53
                                    Address:        127.0.0.53#53
                                    
                                    Non-authoritative answer:
                                    Name:   www.google.com
                                    Address: 172.217.4.196
                                    Name:   www.google.com
                                    Address: 2607:f8b0:4009:806::2004
                                    
                                    

                                    Here
                                    https://linuxize.com/post/how-to-configure-static-ip-address-on-ubuntu-18-04/

                                    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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                                    • F
                                      Farisse
                                      last edited by Farisse Jul 12, 2020, 8:33 PM Jul 12, 2020, 8:32 PM

                                      Yeah you’re right it should work if it was set do not understand why it doesn’t.

                                      Btw thank you for the link but I can’t process as it is explained. I removed netplan to use the old network configuration ( using /etc/network/interfaces & the screenshot above for the dns)

                                      This is the result of the requested command

                                      3243C0C6-218B-442F-B30F-5AB68AB3D35A.png

                                      alt text

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                                      • J
                                        johnpoz LAYER 8 Global Moderator
                                        last edited by Jul 12, 2020, 8:46 PM

                                        So from your nslookup its working, but its pointing to dnsmasq most likely running locally.. Which in turn forwards to whatever dns you want say 192.168.1.1

                                        So now it should be working?

                                        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
                                        • F
                                          Farisse
                                          last edited by Jul 12, 2020, 8:57 PM

                                          Ubuntu is insane haha >.< You set up everything to be used 'externally' and it choose to use local dnsmasq. Whatever ...

                                          It is working indeed, i'm just afraid to restart the machine and lose the connection again. i prefered to follow what you said to check everything and if its not working anymore search from where it doesn't work. So i'm going to restart now and hope it will still work.

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