Use " sudo " before your command line
without sudo i cannot start nmap>
Code:
kcdtv@noname4u:~$ nmap -sS 192.168.0.1
You requested a scan type which requires root privileges.
QUITTING!
adding sudo before my order i can use nmap
Code:
sudo nmap -sS 192.168.0.1
Starting Nmap 6.40 ( http://nmap.org ) at 2013-09-16 09:08 CEST
Nmap scan report for 192.168.0.1
Host is up (0.0067s latency).
Not shown: 998 closed ports
PORT STATE SERVICE
53/tcp open domain
80/tcp open http
MAC Address: B8:55:10:XXXXXX (Zioncom Electronics (Shenzhen))
Nmap done: 1 IP address (1 host up) scanned in 3.03 seconds
Or you can start by "sudo su" in your shell and the shell will be established with root privilege all along and you will be able to launch aplications such as nmap, mdk3, aireplay-ng etc... without writing "sudo"
Now you have got it, sudo is your new friend for ever, it is very important and usefull in debian based system such as Kali or XUbuntu, Ubuntu etc...