By default, netcat outputs nothing when it connects. This makes an instance connecting from an instance connected indistinguishable
until the target host has sent content or a timeout has expired (after which netcat displays an error if it failed to connect). A
timeout will hapen when trying to connect to a filtered port.

Option -v solves this by printing a message when the connection is established, but is not enabled by default.

This could be addressed either by making -v the default or via documentation. Documentation could at least specify that -v prints a
line when the connection is established. There could also be explicit treatment of the issue in the introduction or in the BUGS
section.