Nmap Development mailing list archives
Re: Showing Ports Nmap Hides
From: David Fifield <david () bamsoftware com>
Date: Mon, 31 Aug 2009 08:26:59 -0600
On Sun, Aug 30, 2009 at 02:48:09PM -0500, DePriest, Jason R. wrote:
On Sun, Aug 30, 2009 at 1:06 PM, Andrew Johnston<> wrote:I have recently downloaded and started using Nmap 5.00. Like all version of nmap, I find it is a very helpful tool. But recently, I was charged with scanning a group of computers. All nmap said was there was hundreds of filtered ports. I randomly guess a few ports and nmaped them. Nmap said they were filtered/closed, but they were completely open. How do I force nmap to show these ports? I believe that a firewall on the machine is recognizing the scan, because at first (at least in nessus) is shows them as open, but then the firewall is reconizing the scan, and sending out an RST to each port that was sent a SYN.Running -v -v should be enough to display all the ports. I think a -v will put all the ports in the greppable output.
Also, Nmap doesn't scan every port by default, only the 1000 most common. Use --top-ports with a higher number to scan more or list specifically the ports you want with -p. Use the --reason and --packet-trace options together to scan a couple of ports and see why they are being classified the way they are. David Fifield _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev Archived at http://SecLists.Org
Current thread:
- Showing Ports Nmap Hides Andrew Johnston (Aug 30)
- Re: Showing Ports Nmap Hides DePriest, Jason R. (Aug 30)
- Re: Showing Ports Nmap Hides David Fifield (Aug 31)
- Re: Showing Ports Nmap Hides DePriest, Jason R. (Aug 30)