Peter Van Eeckhoutte's Blog

Posts Tagged ‘open port’

Insecure.org has released a new major version of the free, open source “nmap” security scanner. (Don’t just call nmap a port scanner – Thanks to many improvements over the last years, nmap has become an excellent security scanner).

Visit http://nmap.org/5/ for more information about this new version.

Although there are roughly 600 updates in this new version, these are the top 5 improvements in nmap 5 :

ncat (allows data transfer, redirection and debugging) – (Remember hobbit’s nc ?)
ndiff scan comparison
better performance
improved zenmap GUI (including a real neat feature to visually map the network you have scanned)
Improvement of nmap scripting engine (nse), reviewed existing scripts and added 32 new scripts.

Download and install the new version, buy/read the book, spread the word, and scan ‘til you drop !

Some of my favorite nmap parameters/scan parameters :

Detecting common stateless …

I have written a small powershell script that will help you to monitor various hosts on your network.   Instead of using ping to see if a host is alive, this script will connect to tcp ports, so you can also monitor hosts behind firewalls (or hosts that cannot be pinged).  In addition to this, you can also test that a port is closed (and report that this is ok if that is what you want); and only report a problem when the port is found open (instead of closed)

The script can be downloaded from the link at the bottom of this post.
This is how it works
1. Download the script, unzip it, and put it in a folder on a machine that

has Powershell installed
has access to the hosts you want to monitor

2. Create a text file in the same folder, containing …