Nmap is a program that scans all of the ports in your computer and check it  whether they are open or not.
 
So lets start the scanning process in Backtrack 5 Environment.
 

Ping Scan

 

Range Scan 

 

Stealth Scan (-sS)

 

OS SCAN : It showed us which Operating system is running by the host.

TCP SCAN : This scan will show all the open tcp ports . 

ADVANTAGES :

  1. Speed
  2. Free to use 
  3. Don’t need priviledges
DISADVANTAGES
  1. Easily Detectable and Filterable .
FIN SCAN 
 
 
 
NULL SCAN
 


UDP SCAN
In udp scanning we use udp scan instead of tcp scan .
 
 
Protocol Scan -sO <Target Ip >
 
 
IP PROTOCOL SCAN 
 
This Scan is used to find the ip protocols in use .
 
 
ACK (Acknowledgement Scan)
 

This Article was Written by Vivek Kathayat

Vivek Kathyat is a professional blogger at HackingDNA, writes article about Linux Tools, Vulnerabiltiy Assesment, Penetration Testing & How-to Guides.
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