VNC over shared internet connection

[Rodrigo Farias]

Hi, I'm having problems to use VNC. I would like you help me.

My situation:

  +---------+
  |Client 2 |- 192.168.1.2
  +----+----+
       | Intranet
  +----+----+
  |Server 2 |- 192.168.1.1
  +----+----+
       |
    +--+--+
    |Modem|- 200.97.31.173 (Dynamic)
    +--+--+
       |
+------+------+
|INTERNET     |
+------+------+
       |
    +--+--+
    |Modem|- 200.97.37.113 (Dynamic)
    +--+--+
       |
  +----+----+
  |Server 1 |- 192.168.0.1
  +----+----+
       | Intranet
  +----+----+
  |Client 1 |- 192.168.0.2
  +---------+

I have shared ADSL internet connection in Client 1. Actually the
internet arrives in Modem, which is connected to Server 1. Client 1 and
Server 1 are connected with local intranet. My friend, in Client 2, is
in the same situation. The IPs of Modems chang in every connection to
internet. IPs of Servers and Clients are fixed.

How can I connect Client 1 as viewer and Client 2 as server with VNC?

Thank you.
Rodrigo Farias