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    IPsec Site-to-Site with NAT

    Scheduled Pinned Locked Moved IPsec
    28 Posts 3 Posters 2.5k Views
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    • DerelictD
      Derelict LAYER 8 Netgate
      last edited by

      And how do you source connections from that address?

      Chattanooga, Tennessee, USA
      A comprehensive network diagram is worth 10,000 words and 15 conference calls.
      DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
      Do Not Chat For Help! NO_WAN_EGRESS(TM)

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      • J
        jf5264835
        last edited by

        Screen Shot 2019-08-25 at 1.03.38 PM.png

        They are just setup as Virtual IPs on the WAN interface. Browsing to one that hasn't been setup yet with 1:1 nat takes you to the pfSense login page (https://54.39.70.254/), and those addresses reply to ICMP requests, so I know that part is good.

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        • DerelictD
          Derelict LAYER 8 Netgate
          last edited by Derelict

          Well whatever is set up on WAN has nothing to do with the IPsec NAT.

          That configures what happens to the NAT in the tunnel itself.

          When the other side connects to 172.21.69.1 what do you want to happen?

          Specifically, what connecting to what is not working?

          Chattanooga, Tennessee, USA
          A comprehensive network diagram is worth 10,000 words and 15 conference calls.
          DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
          Do Not Chat For Help! NO_WAN_EGRESS(TM)

          1 Reply Last reply Reply Quote 0
          • J
            jf5264835
            last edited by

            I want to be able to connect to say, 54.39.70.254 in a web browser, and have it show content from 172.21.0.11. From my understanding, I'd need source NAT for the incoming traffic, and a 1:1 NAT for traffic for External IP>Internal Host IP.

            DerelictD 1 Reply Last reply Reply Quote 0
            • DerelictD
              Derelict LAYER 8 Netgate @jf5264835
              last edited by

              @jf5264835

              jf5264835 less than a minute ago

              I want to be able to connect to say, 54.39.70.254 in a web browser,

              Connect to that from where?

              Chattanooga, Tennessee, USA
              A comprehensive network diagram is worth 10,000 words and 15 conference calls.
              DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
              Do Not Chat For Help! NO_WAN_EGRESS(TM)

              1 Reply Last reply Reply Quote 0
              • DerelictD
                Derelict LAYER 8 Netgate
                last edited by

                If you are talking about connections coming into WAN then out over the IPsec to a server across the tunnel then that is not the correct method.

                You would need to set the source on the phase 2 to Network 0.0.0.0/0 with a NAT to Address 54.39.14.0 to make that traffic interesting to IPsec. The WAN external 1:1 address in that case would be 54.39.70.254, not 54.39.70.0.

                Chattanooga, Tennessee, USA
                A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                Do Not Chat For Help! NO_WAN_EGRESS(TM)

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                • J
                  jf5264835
                  last edited by

                  Anywhere. Public IP address, so basically anywhere,anytime.

                  1 Reply Last reply Reply Quote 0
                  • DerelictD
                    Derelict LAYER 8 Netgate
                    last edited by

                    When a connection attempt comes into WAN, the 1:1 NAT translates the destination address. When the connection goes out the IPsec tunnel the NAT there translates the source address.

                    Chattanooga, Tennessee, USA
                    A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                    DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                    Do Not Chat For Help! NO_WAN_EGRESS(TM)

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                    • J
                      jf5264835
                      last edited by

                      Screen Shot 2019-08-25 at 1.23.29 PM.png

                      So I'd want the P2 to be like this?

                      1 Reply Last reply Reply Quote 0
                      • DerelictD
                        Derelict LAYER 8 Netgate
                        last edited by

                        It has to be to have a hope of the traffic being put into IPsec at all.

                        OpenVPN is much more flexible in this regard, but IPsec might be able to be coerced to work.

                        Chattanooga, Tennessee, USA
                        A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                        DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                        Do Not Chat For Help! NO_WAN_EGRESS(TM)

                        1 Reply Last reply Reply Quote 0
                        • J
                          jf5264835
                          last edited by

                          Screen Shot 2019-08-25 at 1.57.13 PM.png

                          ICMP comes in and gets NATed, but nothing goes through the IPsec tunnel.
                          Screen Shot 2019-08-25 at 1.59.35 PM.png

                          Time to try OpenVPN?

                          1 Reply Last reply Reply Quote 0
                          • DerelictD
                            Derelict LAYER 8 Netgate
                            last edited by

                            That does not look like the traffic is being picked up by the traffic selectors after the NAT happens. It looks like it is just going back out the WAN.

                            I was expecting you to be pinging .254 from the outside, not .0

                            Chattanooga, Tennessee, USA
                            A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                            DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                            Do Not Chat For Help! NO_WAN_EGRESS(TM)

                            1 Reply Last reply Reply Quote 0
                            • J
                              jf5264835
                              last edited by

                              I was using the .254 as an example, been primarily trying things with just the .0.

                              1 Reply Last reply Reply Quote 0
                              • DerelictD
                                Derelict LAYER 8 Netgate
                                last edited by

                                What is the output of swanctl --list-sas ??

                                Chattanooga, Tennessee, USA
                                A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                                DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                                Do Not Chat For Help! NO_WAN_EGRESS(TM)

                                1 Reply Last reply Reply Quote 0
                                • J
                                  jf5264835
                                  last edited by

                                  con1000: #156, ESTABLISHED, IKEv1, 07efff97c8376e52_i* 1270ead44af08916_r
                                    local  '167.114.185.196' @ 167.114.185.196[4500]
                                    remote '76.31.172.16' @ 76.31.172.16[4500]
                                    AES_CBC-128/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_2048
                                    established 38s ago, reauth in 27959s
                                    con1000: #70, reqid 6, INSTALLED, TUNNEL-in-UDP, ESP:AES_CBC-128/HMAC_SHA1_96/MODP_2048
                                      installed 38s ago, rekeying in 2759s, expires in 3562s
                                      in  c91e225c,      0 bytes,     0 packets,    38s ago
                                      out ca6a137a,      0 bytes,     0 packets
                                      local  54.39.14.0/32|/0
                                      remote 172.21.0.0/24|/0
                                  
                                  1 Reply Last reply Reply Quote 0
                                  • J
                                    jf5264835
                                    last edited by

                                    Well, doesn't matter now, I got it properly working using OpenVPN, took all of an hour including coffee time, vs IPsec which has been weeks in the making. Thank you for steering me into the light @Derelict

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