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    offloading OpenVPN using external gateway

    Scheduled Pinned Locked Moved Routing and Multi WAN
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    • bingo600B
      bingo600 @chrispazz
      last edited by

      @chrispazz

      ??

      Then what is your ISP router inside ip ?

      If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

      pfSense+ 23.05.1 (ZFS)

      QOTOM-Q355G4 Quad Lan.
      CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
      LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

      C 1 Reply Last reply Reply Quote 0
      • bingo600B
        bingo600 @chrispazz
        last edited by

        @chrispazz said in offloading OpenVPN using external gateway:

        I tried enabling logging on the rule and I can confirm it is using it.

        Ok

        Now try to do a packet trace on the pfSense WAN

        Set host address to the Raspi IP

        63beebf6-8231-43a9-965c-b3349295c4c7-image.png

        And generate some traffic destined for VPN

        If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

        pfSense+ 23.05.1 (ZFS)

        QOTOM-Q355G4 Quad Lan.
        CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
        LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

        C 1 Reply Last reply Reply Quote 0
        • C
          chrispazz @bingo600
          last edited by

          @bingo600 oops....sorry. Inside IP of router is 192.168.5.254.

          Pf sense has 192.168.5.1 on the WAN side...

          1 Reply Last reply Reply Quote 0
          • C
            chrispazz @bingo600
            last edited by

            @bingo600

            Activated packet capture on host 192.168.5.9 and opened a webpage with www.google.it:

            16:58:57.410983 IP 192.168.5.1 > 192.168.5.9: ICMP echo request, id 43267, seq 8815, length 9
            16:58:57.920985 IP 192.168.5.1 > 192.168.5.9: ICMP echo request, id 43267, seq 8816, length 9

            bingo600B 1 Reply Last reply Reply Quote 0
            • bingo600B
              bingo600 @chrispazz
              last edited by

              @chrispazz said in offloading OpenVPN using external gateway:

              @bingo600

              Activated packet capture on host 192.168.5.9 and opened a webpage with www.google.it:

              16:58:57.410983 IP 192.168.5.1 > 192.168.5.9: ICMP echo request, id 43267, seq 8815, length 9
              16:58:57.920985 IP 192.168.5.1 > 192.168.5.9: ICMP echo request, id 43267, seq 8816, length 9

              Where did 192.168.5.9 come from ??
              did you mean 5.99

              If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

              pfSense+ 23.05.1 (ZFS)

              QOTOM-Q355G4 Quad Lan.
              CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
              LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

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              • C
                chrispazz @bingo600
                last edited by chrispazz

                @bingo600 yes is 5.99 :) don't hate me eheheh

                bingo600B 1 Reply Last reply Reply Quote 0
                • bingo600B
                  bingo600 @chrispazz
                  last edited by

                  @chrispazz

                  So we have confirmed that the ICMP (ping) packages are actually being "policy routed" from 5.1 (pfSense) to 5.99 (RasPI)

                  We don't see any Echo reply ... The issue is probably on the RasPI

                  If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

                  pfSense+ 23.05.1 (ZFS)

                  QOTOM-Q355G4 Quad Lan.
                  CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
                  LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

                  C 1 Reply Last reply Reply Quote 1
                  • bingo600B
                    bingo600
                    last edited by

                    On the Raspi (as root)

                    What does a : sudo iptables -L show ?

                    And this one ?
                    92d9b6a4-89e6-402d-aeb5-c359a7092195-image.png

                    If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

                    pfSense+ 23.05.1 (ZFS)

                    QOTOM-Q355G4 Quad Lan.
                    CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
                    LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

                    C 1 Reply Last reply Reply Quote 0
                    • C
                      chrispazz @bingo600
                      last edited by

                      This post is deleted!
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                      • bingo600B
                        bingo600
                        last edited by

                        Did you reboot the RasPI after enabling forwarding ?

                        If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

                        pfSense+ 23.05.1 (ZFS)

                        QOTOM-Q355G4 Quad Lan.
                        CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
                        LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

                        1 Reply Last reply Reply Quote 0
                        • C
                          chrispazz @bingo600
                          last edited by chrispazz

                          @bingo600 yes, forward is activated.

                          Chain INPUT (policy DROP)
                          target prot opt source destination
                          ACCEPT all -- anywhere anywhere
                          ACCEPT icmp -- anywhere anywhere
                          ACCEPT tcp -- anywhere anywhere tcp dpt:ssh
                          ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED

                          Chain FORWARD (policy DROP)
                          target prot opt source destination
                          ACCEPT all -- anywhere anywhere
                          ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED

                          Chain OUTPUT (policy ACCEPT)
                          target prot opt source destination

                          and yes, I rebooted it a lot of times :)

                          bingo600B 1 Reply Last reply Reply Quote 0
                          • bingo600B
                            bingo600 @chrispazz
                            last edited by

                            @chrispazz

                            Does this one give the expected result , should be your (OpenVPN public ip) ?

                            wget http://ipinfo.io/ip -qO -

                            Can you ping the google.it from the RasPI ?

                            /Bingo

                            If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

                            pfSense+ 23.05.1 (ZFS)

                            QOTOM-Q355G4 Quad Lan.
                            CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
                            LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

                            C 1 Reply Last reply Reply Quote 0
                            • C
                              chrispazz @bingo600
                              last edited by

                              @bingo600 said in offloading OpenVPN using external gateway:

                              wget http://ipinfo.io/ip -qO -

                              Both yes.
                              And if I test a traceroute from raspi I can confirm it is going outside using VPN connection....

                              bingo600B 1 Reply Last reply Reply Quote 0
                              • bingo600B
                                bingo600 @chrispazz
                                last edited by bingo600

                                @chrispazz

                                Now : I would connect a PC directly to the RasPI , or directly to the ISP inside LAN , and set def-gw to the RasPI , and maybe DNS to 8.8.8.8

                                Then start debugging directly between the PC & The Raspi.

                                This can come in handy ... Disables all iptables stuff on the Raspi.
                                But only for this "boot sesion"

                                iptables -F
                                iptables -X
                                iptables -t nat -F
                                iptables -t nat -X
                                iptables -t mangle -F
                                iptables -t mangle -X
                                iptables -P INPUT ACCEPT
                                iptables -P FORWARD ACCEPT
                                iptables -P OUTPUT ACCEPT
                                
                                

                                I use these rules on my Deb10 machines , for OVPN to a VPN provider.

                                Remember to replace ens192 with the name of your ethernet interface on the Raspi.

                                # Default policy to drop all incoming packets
                                iptables -P INPUT DROP
                                iptables -P FORWARD DROP
                                
                                # Accept incoming packets from localhost and the LAN interface
                                iptables -A INPUT -i lo -j ACCEPT
                                iptables -A INPUT -i ens192 -j ACCEPT
                                
                                # Accept incoming packets from the WAN if the router initiated
                                # the connection
                                iptables -A INPUT -i tun0 -m conntrack \
                                    --ctstate ESTABLISHED,RELATED -j ACCEPT
                                
                                # Forward LAN packets to the WAN
                                iptables -A FORWARD -i ens192 -o tun0 -j ACCEPT
                                
                                # Forward WAN packets to the LAN if the LAN initiated the
                                # connection
                                iptables -A FORWARD -i tun0 -o ens192 -m conntrack \
                                    --ctstate ESTABLISHED,RELATED -j ACCEPT
                                
                                # NAT traffic going out the WAN interface
                                iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE
                                #
                                
                                
                                

                                Remember to save new rules if you change them

                                sudo systemctl enable netfilter-persistent
                                

                                If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

                                pfSense+ 23.05.1 (ZFS)

                                QOTOM-Q355G4 Quad Lan.
                                CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
                                LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

                                C 1 Reply Last reply Reply Quote 0
                                • C
                                  chrispazz @bingo600
                                  last edited by chrispazz

                                  @bingo600 said in offloading OpenVPN using external gateway:

                                  sudo systemctl enable netfilter-persistent

                                  I made some other tests.

                                  Raspberry is working good if I set a client to use it as network interface gateway and connection will go thru VPN (using my own iptables rules or yours).

                                  So it seems that when I go thru pfsense, WAN main gateway (ISP router) is getting used instead of firewall rule gateway...

                                  bingo600B 1 Reply Last reply Reply Quote 0
                                  • bingo600B
                                    bingo600 @chrispazz
                                    last edited by

                                    @chrispazz said in offloading OpenVPN using external gateway:

                                    @bingo600 said in offloading OpenVPN using external gateway:

                                    sudo systemctl enable netfilter-persistent

                                    I made some other tests.

                                    Raspberry is working good if I set a client to use it as network interface gateway and connection will go thru VPN (using my own iptables rules or yours).

                                    So it seems that when I go thru pfsense, WAN main gateway (ISP router) is getting used instead of firewall rule gateway...

                                    That doesn't make sense
                                    The packet trace you made doesn't lie.

                                    If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

                                    pfSense+ 23.05.1 (ZFS)

                                    QOTOM-Q355G4 Quad Lan.
                                    CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
                                    LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

                                    1 Reply Last reply Reply Quote 0
                                    • bingo600B
                                      bingo600
                                      last edited by

                                      Now is the time to use tcpdump on the RasPI

                                      https://kalitut.com/record-network-traffic-with-raspberry/

                                      To see what it actually receives & forwards

                                      If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

                                      pfSense+ 23.05.1 (ZFS)

                                      QOTOM-Q355G4 Quad Lan.
                                      CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
                                      LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

                                      C 1 Reply Last reply Reply Quote 0
                                      • C
                                        chrispazz @bingo600
                                        last edited by

                                        @bingo600
                                        This is traceroute from the client with the firewall rule applies:

                                        traceroute to www.google.it (216.58.215.227), 64 hops max, 52 byte packets
                                        1 192.168.5.254 (192.168.5.254) 2.370 ms 1.583 ms 1.516 ms

                                        The first hop go to ISP gateway....I can't see Raspi here...

                                        bingo600B 1 Reply Last reply Reply Quote 0
                                        • bingo600B
                                          bingo600 @chrispazz
                                          last edited by bingo600

                                          @chrispazz
                                          But that is not consistent with the packet trace you made on the pfSense

                                          Can you do another trace , and then the traceroute ?

                                          If you find my answer useful - Please give the post a šŸ‘ - "thumbs up"

                                          pfSense+ 23.05.1 (ZFS)

                                          QOTOM-Q355G4 Quad Lan.
                                          CPUĀ  : Core i5 5250U, Ram : 8GB Kingston DDR3LV 1600
                                          LANĀ  : 4 x Intel 211, DiskĀ  : 240G SAMSUNG MZ7L3240HCHQ SSD

                                          C 1 Reply Last reply Reply Quote 0
                                          • C
                                            chrispazz @bingo600
                                            last edited by

                                            @bingo600 if I try a trace to www.google.it IP address as host I get this:

                                            18:25:31.846958 IP 192.168.5.1.4704 > 172.217.168.35.443: UDP, length 1350
                                            18:25:31.883433 IP 172.217.168.35.443 > 192.168.5.1.4704: UDP, length 1350

                                            so it is using 192.168.5.1 as gateway....

                                            C bingo600B 2 Replies Last reply Reply Quote 0
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