连接到lt2p VPN客户端

我遇到了一个可能与几个不同职位相关的问题,但是我不确定实际过程是什么,甚至从哪里开始。

Currently I have successfully set up a VPN with xl2tpd/strongswan following the steps in this tutorial. What I would like to do, is take specific ports from other servers (not the client VPN) and forward them to specific ports and IPs on to the client VPN with the intent to access specific shared folders. The topology should look like

+-------------------+             +---------------------+
|                   |             |                     |
|  server1          |             |          server2    |
|                   |             |                     |
|            port1  |             |   port1      port2  |
+-----------------+-+             +----+----------+-----+
                  |                    |          |
                  |                    |          |
                  |                    |          |
                  |       +------------+          |
                  |       |                       |
                  |       |      +----------------+
           port_x |       |      | port_z
              +---+-------+------+-+
              |         port_y     |
              |                    |
              |    VPN client      |
              |                    |
              |                    |
              +--------+-----------+
                       |
                       |VPN Connection
                       |
                       |
              +--------+-----------+
              |                    |
              |                    |
              |    VPN server      |
              |                    |
              |                    |
              +--------------------+

请注意,这不是通过局域网。

我已经研究了以下答案和站点(以及更多),但是它们似乎没有帮助,但是我认为这些站点与我的问题最相关:

可能我显然是新手,所以我可能会混用术语,并且我知道目前对于这种类型的网络我还是一无所知。在此先感谢您的帮助。

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