vaheeD khoshnouD

Nmap is a command line tool for network exploration or security auditing.It supports ping scanning (determine which hosts are up), many port scanning techniques (determine what services the hosts are offering), and TCP/IP fingerprinting (remote host operating system identification).

Installation Debian / Ubuntu

To install nmap for Debian and Ubuntu Linux based server systems type the following apt-get command:
$ sudo apt-get install nmap
Sample outputs:

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  nmap
0 upgraded, 1 newly installed, 0 to remove and 2 not upgraded.
Need to get 1,643 kB of archives.
After this operation, 6,913 kB of additional disk space will be used.
Get:1 http://mirrors.service.networklayer.com/ubuntu/ precise/main nmap amd64 5.21-1.1ubuntu1 [1,643 kB]
Fetched 1,643 kB in 0s (16.4 MB/s)
Selecting previously unselected package nmap.
(Reading database ... 56834 files and directories currently installed.)
Unpacking nmap (from .../nmap_5.21-1.1ubuntu1_amd64.deb) ...
Processing triggers for man-db ...
Setting up nmap (5.21-1.1ubuntu1) ...

Examples

To find the nmap version, enter:
# nmap -V
OR
# nmap --version
Sample outputs:

Nmap version 5.21 ( http://nmap.org )

Installation CentOS / RHEL

To install nmap on RHEL based Linux distributions, type the following yum command:
# yum install nmap
Sample outputs:

 
Loaded plugins: protectbase, rhnplugin, security
0 packages excluded due to repository protections
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package nmap.x86_64 2:5.51-2.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package    Arch         Version               Repository                  Size
================================================================================
Installing:
 nmap       x86_64       2:5.51-2.el6          rhel-x86_64-server-6       2.8 M

Transaction Summary
================================================================================
Install       1 Package(s)

Total download size: 2.8 M
Installed size: 0
Is this ok [y/N]: y
Downloading Packages:
nmap-5.51-2.el6.x86_64.rpm                               | 2.8 MB     00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : 2:nmap-5.51-2.el6.x86_64                                     1/1
  Verifying  : 2:nmap-5.51-2.el6.x86_64                                     1/1

Installed:
  nmap.x86_64 2:5.51-2.el6

Complete!

How do I use nmap command?

To find out nmap version, run:
# nmap --version
Sample outputs:

Nmap version 5.51 ( http://nmap.org )

Installation OpenBSD

Use pkg_add command to install software package called nmap under OpenBSD operating system. First, you must set the PKG_PATH environment variable as follows:

export PKG_PATH=http://mirror.esc7.net/pub/OpenBSD/`uname -r`/packages/`machine -a`/

Type the following pkg_add command to install nmap tool. The -v flag was used to give a more verbose output. This option is not needed but it is helpful for debugging and was used here to give a little more insight into what pkg_add is actually doing under OpenBSD:
# pkg_add -v nmap
Sample outputs:

nmap-6.01: ok

Examples

To find out nmap version, enter:
# nmap --version
Sample outputs:

Nmap version 6.01 ( http://nmap.org )
Platform: i386-unknown-openbsd5.2
Compiled with: liblua-5.1.5 openssl-1.0.0f libpcre-8.30 libpcap-(OpenBSD libpcap) nmap-libdnet-1.12 ipv6
Compiled without:

Installation Mac OSX

To install nmap for Mac OSX based server systems type the following port command:
$ sudo port install nmap
Sample outputs:

--->  Computing dependencies for nmap

..
..
..

Examples

To find the nmap version, enter:
# nmap -V
OR
# nmap --version
Sample outputs:

Nmap version 6.25 ( http://nmap.org )
Platform: x86_64-apple-darwin10.8.0
Compiled with: liblua-5.2.1 openssl-0.9.7l nmap-libpcre-7.6 nmap-libpcap-1.2.1 nmap-libdnet-1.12 ipv6
Compiled without:
Available nsock engines: kqueue poll select