Manually opening TCP ports

[Wojciech Puchar]

>
> I am just wondering if there is a utility (or any feature in FreeBSD)
> that allows me to manually open a TCP port on a machine. I am looking
> for a way that could either allow me to open ALL or many TCP ports on
> a machine.

man nc

>
> Also, is there any way of running a service on more than a single
> port, or on all or many ports?
not all, but on more than a single - of course, just start more than once.