How to list the ports open and closed by my firewall?

[Joseph Kubik]

On Sunday 23 April 2006 13:33, frankpeng-VsqqI1RANlHk1uMJSBkQmQ at public.gmane.org wrote:
> Hi,
>
> I made a simple firewall and I did not block some ports but some clients
> says my firewall blocked some ports. How do I know which ports are open and
> which are closed by my firewall?
>
> Thanks.
>
> Frank Peng.
> ___________________________________________________
> Try the New Netscape Mail Today!
> Virtually Spam-Free | More Storage | Import Your Contact List
> http://mail.netscape.com

nmap is a tool for this.
http://www.insecure.org/nmap/

-Joseph-
--
The Toronto Linux Users Group.      Meetings: http://tlug.ss.org
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml