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    [RESOLVED]No internet on ubuntu when disable dhcp

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    • johnpozJ
      johnpoz LAYER 8 Global Moderator @Farisse
      last edited by

      @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!

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      • F
        Farisse @johnpoz
        last edited by

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

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        • johnpozJ
          johnpoz LAYER 8 Global Moderator
          last edited by johnpoz

          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
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          • F
            Farisse @johnpoz
            last edited by

            @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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            • johnpozJ
              johnpoz LAYER 8 Global Moderator
              last edited by johnpoz

              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
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              • F
                Farisse @johnpoz
                last edited by Farisse

                @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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                • johnpozJ
                  johnpoz LAYER 8 Global Moderator
                  last edited by

                  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
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                  • F
                    Farisse
                    last edited by Farisse

                    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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                    • johnpozJ
                      johnpoz LAYER 8 Global Moderator
                      last edited by johnpoz

                      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
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                      Please don't Chat/PM me for help, unless mod related
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                      • F
                        Farisse @johnpoz
                        last edited by

                        @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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                        • johnpozJ
                          johnpoz LAYER 8 Global Moderator
                          last edited by

                          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
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                          • F
                            Farisse
                            last edited by

                            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 ?

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                            • johnpozJ
                              johnpoz LAYER 8 Global Moderator
                              last edited by

                              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 2.7.2, 24.11

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                              • johnpozJ
                                johnpoz LAYER 8 Global Moderator @Farisse
                                last edited by johnpoz

                                @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
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                                • F
                                  Farisse
                                  last edited by

                                  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

                                    @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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                                    • johnpozJ
                                      johnpoz LAYER 8 Global Moderator
                                      last edited by johnpoz

                                      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 2.7.2, 24.11

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                                      • F
                                        Farisse
                                        last edited by Farisse

                                        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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                                        • johnpozJ
                                          johnpoz LAYER 8 Global Moderator
                                          last edited by

                                          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 2.7.2, 24.11

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                                          • F
                                            Farisse
                                            last edited by

                                            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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