From: Armin Schoech (armin.schoechweb.de)
Date: Thu May 29 2003 - 08:44:51 CDT

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Hello !

> how do i know if my server has an open port? how? can i use iptables
> to restrict ports thats open?
>
--> You can check the ports that are used on your machine as root with
the following two commands:
"lsof -i"
"netstat -at"

If you want to test your firewall, you should run a portscan from
another pc. First try would be
"nmap -sT" and "nmap -sU". Type "man nmap" for more information about
this portscanner.

HTH,
Armin

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