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    Port 5900 (vnc) to a pc with different gateway

    Scheduled Pinned Locked Moved NAT
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    • johnpozJ
      johnpoz LAYER 8 Global Moderator
      last edited by

      Opening up vnc to the public internet is a bad idea all the way around.. Can you atleast lock down the source IP of who is going to be using this port forward?  You really should vpn into your network to access this sort of thing from outside your network.

      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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      • T
        tonysud
        last edited by

        @johnpoz:

        Can you atleast lock down the source IP of who is going to be using this port forward?

        No, I can't. Client has dynamic internet address

        @johnpoz:

        You really should vpn into your network to access this sort of thing from outside your network.

        client is too lazy to make a vpn before connecting to vnc and I don't want him in my lan

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        • johnpozJ
          johnpoz LAYER 8 Global Moderator
          last edited by

          and from the vnc to that box, what stops him from going where ever he wants in that lan?

          Client too lazy to do something correctly shouldn't be allowed access - that is the best solution.

          If your going to open up something like that to the public, I would make sure its locked down where that box is isolated and can not do anything other than what he needs to do with it.  And make it hard for him to vnc to it - leave the rule disabled unless he calls and sets up time..

          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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          • T
            tonysud
            last edited by

            @johnpoz:

            and from the vnc to that box, what stops him from going where ever he wants in that lan?

            The client that connects to vnc server call us, and we see what he does with the pc
            no problem for this

            Translating the source address would be the only option here, otherwise response packets from 192.168.0.75 are directed to its default gateway.

            To do so, switch the pfSense Outbound NAT to Hybrid mode. Firewall > NAT > Outbound
            Add a rule:
            Interface: LAN (or which is facing to 192.168.0.75)
            Protocol: TCP
            source: any
            destination: Network - 192.168.0.75/32 port 5900
            Translation: Interface address

            I have tried, and it seems to work
            Infact I see on vnc server: connection from the pfsense lan ip
            but I noticed that randomly, I loose connection, and I can't login to web interface of pfsense machine
            If I reboot the machine, it start working again

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            • johnpozJ
              johnpoz LAYER 8 Global Moderator
              last edited by

              "The client that connects to vnc server call us, and we see what he does with the pc"

              Ok so the rule on pfsense is disabled until he calls, and vnc is not even running on pc until he calls.  That is something.

              "but I noticed that randomly, I loose connection, and I can't login to web interface of pfsense machine"

              That seems unrelated to your vnc ?  Port forwarding traffic would have nothing to do with having to reboot pfsense because you can not access its web gui.  Does ssh work, can you ping pfsense.  Is traffic flowing through pfsense for other users, dns working, etc. etc.

              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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              • T
                tonysud
                last edited by

                Ok so the rule on pfsense is disabled until he calls, and vnc is not even running on pc until he calls.  That is something.

                No, the rule is always enabled, but vnc server is always disabled, until the client call, so we start vnc server and he connect to pfsense WANIP:5900

                That seems unrelated to your vnc ?  Port forwarding traffic would have nothing to do with having to reboot pfsense because you can not access its web gui.  Does ssh work, can you ping pfsense.  Is traffic flowing through pfsense for other users, dns working, etc. etc.

                I don't know, I have installed pfsense on a pc only to make this redirect to vnc server, I haven't other users using this pfsense machine

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                • johnpozJ
                  johnpoz LAYER 8 Global Moderator
                  last edited by

                  seems odd that you would need pfsense to allow access to vnc if vnc is not even using pfsense as its gateway and you have some other connection in and out of your network.

                  So you don't know if you can ssh or ping pfsense when you can not access its gui?

                  Could you draw up your network and how you have pfsense deployed in it, etc.

                  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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                  • T
                    tonysud
                    last edited by

                    I'm testing vnc through pfsense and it seems working very well now
                    probably I did some mistakes when I set up rules

                    the problem with the vnc server was this: I have as gateway of that pc a router that has dynamic ip address, but I wanted to give access to that pc using a static ip address, so I set up pfsense with static ip address, and through pfsense vnc server is always reachable without dynamic dns issues

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                    • johnpozJ
                      johnpoz LAYER 8 Global Moderator
                      last edited by

                      That makes no sense - so pfsense is behind your other router, or on same isp connection but static?  Or a different isp?

                      pfsense has a public IP on it, ie not rf1918 (10.x.x.x, 192.168.x.x, 172.16-31.x.x) on its wan?  And this is the same ISP that your other router is dynamic wan IP?

                      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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                      • T
                        tonysud
                        last edited by

                        we have 8 internet connections with different ISP (two lines of them are of the same ISP), with different speed, some with dynamic IP via PPPOE, some with static IP
                        we also have a /29 subnet.. one of those IP I have used on wan interface of pfsense

                        pfsense has a public IP on it, ie not rf1918 (10.x.x.x, 192.168.x.x, 172.16-31.x.x) on its wan?

                        yes

                        And this is the same ISP that your other router is dynamic wan IP?

                        no

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