nmap gives info not of open ports but on services that are running.

[Strong]

On Wed, 02 May 2007 15:10:06 -0700 Michael A Peters <mpeters at mac.com>
wrote:
> You are probably using iptables to block an external IP address and
> using nmap on an internal IP address.
> 
> Try running nmap from a different machine.

THank You, but is there a way I can inspect my open ports from within
my machine?

More over, I set in iptables simply reject all - why it matters which
address (internal/external)?