Docker tunnel traffic on specific port via VPN





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Not sure if this is docker specific or a general networking question.



I'm running a Debian Jessie server with serveral docker containers. My understanding is that docker creates a virtual interface (or strictly speaking a virtual ethernet bridge) called docker0 and binds the virtual interfaces of each individual container. It then manipulates the host's iptables to allow communication between each container's exposed ports and the host's network.



I have a VPN, the interface is tun0. One of the containers exposes two ports: 8888 and 23456. I want to tunnel all traffic to and from port 23456 through the VPN.



How can this be done?



Another way of looking at this is that docker automatically routes traffic based on the port to the right container. I want to insert another layer via iptables, where traffic on port 23456 is directed to the VPN and any traffic from the VPN is directed to port 23456.



For info, the VPN provider uses OpenVPN.










share|improve this question





























    2















    Not sure if this is docker specific or a general networking question.



    I'm running a Debian Jessie server with serveral docker containers. My understanding is that docker creates a virtual interface (or strictly speaking a virtual ethernet bridge) called docker0 and binds the virtual interfaces of each individual container. It then manipulates the host's iptables to allow communication between each container's exposed ports and the host's network.



    I have a VPN, the interface is tun0. One of the containers exposes two ports: 8888 and 23456. I want to tunnel all traffic to and from port 23456 through the VPN.



    How can this be done?



    Another way of looking at this is that docker automatically routes traffic based on the port to the right container. I want to insert another layer via iptables, where traffic on port 23456 is directed to the VPN and any traffic from the VPN is directed to port 23456.



    For info, the VPN provider uses OpenVPN.










    share|improve this question

























      2












      2








      2








      Not sure if this is docker specific or a general networking question.



      I'm running a Debian Jessie server with serveral docker containers. My understanding is that docker creates a virtual interface (or strictly speaking a virtual ethernet bridge) called docker0 and binds the virtual interfaces of each individual container. It then manipulates the host's iptables to allow communication between each container's exposed ports and the host's network.



      I have a VPN, the interface is tun0. One of the containers exposes two ports: 8888 and 23456. I want to tunnel all traffic to and from port 23456 through the VPN.



      How can this be done?



      Another way of looking at this is that docker automatically routes traffic based on the port to the right container. I want to insert another layer via iptables, where traffic on port 23456 is directed to the VPN and any traffic from the VPN is directed to port 23456.



      For info, the VPN provider uses OpenVPN.










      share|improve this question














      Not sure if this is docker specific or a general networking question.



      I'm running a Debian Jessie server with serveral docker containers. My understanding is that docker creates a virtual interface (or strictly speaking a virtual ethernet bridge) called docker0 and binds the virtual interfaces of each individual container. It then manipulates the host's iptables to allow communication between each container's exposed ports and the host's network.



      I have a VPN, the interface is tun0. One of the containers exposes two ports: 8888 and 23456. I want to tunnel all traffic to and from port 23456 through the VPN.



      How can this be done?



      Another way of looking at this is that docker automatically routes traffic based on the port to the right container. I want to insert another layer via iptables, where traffic on port 23456 is directed to the VPN and any traffic from the VPN is directed to port 23456.



      For info, the VPN provider uses OpenVPN.







      linux networking vpn routing iptables






      share|improve this question













      share|improve this question











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      asked May 7 '15 at 8:51









      fswingsfswings

      539523




      539523






















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          This should be completely automatic, except for the need of the usual masquerade rule:



            iptables -t nat -A POSTROUTING -i docker0 -o tun0 -j MASQUERADE


          Just for the sake of thoroughness, make sure you have the routing rule, on the host, servicing docker0: if you can ping the dockers from the host, no need to read further. Otherwise add



            ip route add Docker'sNetwork/16 via dev docker0





          share|improve this answer
























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            1 Answer
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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            0














            This should be completely automatic, except for the need of the usual masquerade rule:



              iptables -t nat -A POSTROUTING -i docker0 -o tun0 -j MASQUERADE


            Just for the sake of thoroughness, make sure you have the routing rule, on the host, servicing docker0: if you can ping the dockers from the host, no need to read further. Otherwise add



              ip route add Docker'sNetwork/16 via dev docker0





            share|improve this answer




























              0














              This should be completely automatic, except for the need of the usual masquerade rule:



                iptables -t nat -A POSTROUTING -i docker0 -o tun0 -j MASQUERADE


              Just for the sake of thoroughness, make sure you have the routing rule, on the host, servicing docker0: if you can ping the dockers from the host, no need to read further. Otherwise add



                ip route add Docker'sNetwork/16 via dev docker0





              share|improve this answer


























                0












                0








                0







                This should be completely automatic, except for the need of the usual masquerade rule:



                  iptables -t nat -A POSTROUTING -i docker0 -o tun0 -j MASQUERADE


                Just for the sake of thoroughness, make sure you have the routing rule, on the host, servicing docker0: if you can ping the dockers from the host, no need to read further. Otherwise add



                  ip route add Docker'sNetwork/16 via dev docker0





                share|improve this answer













                This should be completely automatic, except for the need of the usual masquerade rule:



                  iptables -t nat -A POSTROUTING -i docker0 -o tun0 -j MASQUERADE


                Just for the sake of thoroughness, make sure you have the routing rule, on the host, servicing docker0: if you can ping the dockers from the host, no need to read further. Otherwise add



                  ip route add Docker'sNetwork/16 via dev docker0






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Jun 13 '15 at 12:24









                MariusMatutiaeMariusMatutiae

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