How would I connect from the Internet to a machine in the internal network which is behind a router?
You should enable “port forwarding” in your router’s configuration. Port forwarding allows passing external connections to computers in the internal network. Almost all routers support this type of redirection. For example, to access VNC or TightVNC server running on default ports, a router can be configured such way that TCP connections to ports 5900 and 5800 would be passed to the same ports of a particular machine with a specified private IP address (typically 192.168.x.x). Here is an example of configuring port forwarding, assuming that TightVNC Server is running on default ports 5900 and 5800, on the machine with IP 192.168.1.
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