RE: [fw-wiz] How to test a gateway / NAT for ports allowed

From: Vinicius Moreira Mello (vinicius_at_lineone.net)
Date: 11/09/03

  • Next message: Barney Wolff: "Re: [fw-wiz] RE: Why blocking bogons buys you nothing (Mikael Olsson)" 
    To: firewall-wizards@honor.icsalabs.com
Date: Sun, 9 Nov 2003 20:40:33 -0200

    Hi,

          Assuming that you are inside the network of the NAT gateway, you can
    use nmap to find out what IS blocked. A single 'nmap <target>' should show
    you what is 'filtered'. You can test what is not blocked using individual
    ports, such like:

    # nmap -P0 -sS -p 6667 --packet_trace <targets> 

    --
Vinicius
>-- Original Message --
>Reply-To: jago25_98@catholic.org
>From: "Jago Pearce" <jago25_98@hotmail.com>
>To: firewall-wizards@honor.icsalabs.com
>Subject: [fw-wiz] How to test a gateway / NAT for ports allowed
>Date: Sat, 08 Nov 2003 21:02:45 +0000
>
>... and ports blocked. It seems IRC ports may be blocked but I >need to
be sure. How can I use nmap to find what ISN'T blocked?
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