Manually opening TCP ports

[David Vincent]

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Siraj Shaikh wrote:
> I am just wondering if there is a utility (or any feature in
> ubuntu/Linux) 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.

Ever heard of "Port Knocking"?

http://www.google.ca/search?q=port+knocking

> Also, is there any way of running a service on more than a single
> port, or on all or many ports?

This depends on the service.

- -d
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