Scanning Hosts with Nmap for vulnerability assessment.
Using Nmap
Nmap can be run from a shell prompt by typing the nmap command followed by the hostname or IP address of the machine to scan.
Administrators can use Nmap on a network to find host systems and open ports on those systems.
Nmap is a popular tool included in Red Hat Enterprise Linux that can be used to determine the layout of a network. Nmap has been available for many years and is probably the most often used tool when gathering information. An excellent man page is included that provides a de-
tailed description of its options and usage.
Nmap is a competent first step in vulnerability assessment. You can map out all the hosts within your network and even pass an option that allows Nmap to attempt to identify the operating system running on a particular host.
Starting Nmap 4.76 ( http://nmap.org ) at 2009-10-16 16:05 EDT
Interesting ports on localhost.localdomain (127.0.0.1):
Not shown: 996 closed ports
PORT STATE SERVICE
22/tcp open ssh
53/tcp open domain
3128/tcp open squid-http
3306/tcp open mysql
Nmap done: 1 IP address (1 host up) scanned in 0.32 seconds
For more information about using Nmap, refer to the official homepage at the following URL: http://www.insecure.org/
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