Database access over INTERNET

I have a database on a machine on the INTERNET (say MAC1).
I also have a LAN setup, wherein we access the internet via a proxy server.
I can ping MAC1 from the proxy server on my LAN but as I cannot ping MAC1 from any other machine in the LAN, and hence I am unable to create Net8 connection, and hence could not connect to the server.
Looking for a way around.
Advice..................

The most obvious solution is open a port in the firewall, by default, that is 1521.
Have you considered using a VPN or SSH tunnel? (If your server is *NIX based.)

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