Sunday, June 30, 2019

TCP scanning using NMAP

What is Nmap
  • Nmap (Network Mapper) is a free and open source (license) utility.
  • Nmap can network discovery and security auditing.
  • Many systems and network administrators also find it useful for tasks such as
    • network inventory
    • managing service upgrade schedules
    • monitoring host
    • service uptime
  • Nmap uses raw IP packets in novel ways to determine
    • what hosts are available on the network
    • what services (application name and version) those hosts are offering
    • what operating systems (and OS versions) they are running
    • what type of packet firewall are in use
    • and dozens of other characteristics
What is TCP Scanning
  • The two basic scan types used most in Nmap are
    • TCP connect scanning
      • sockets programming uses a system call named connect to begin a TCP connection to a remote site. If connect succeeds, a connection was made.This allows a basic type of port scan, which attempts to connect to every port in turn, and notes whether or not the connection succeeded. Once the scan is completed, ports to which a connection could be established are listed as open, the rest are said to be closed. 
    • TCP SYN scanning
      • When a TCP connection is made between two systems, a process known as a "three way handshake" occurs. This involves the exchange of three packets, and synchronises the systems with each other. 
Nmap Practical using Nmap tools



Step 1 : Open Zenmap in your computer


Step 2 : In Target Filed Write IP Address or Website (Target System) and click on scan button


Step 3 : You can find open port list if they are otherwise u can't get any open port

Step 4 : You can find Traceroute path on Topology tab


Step 5 : You can find all the host details in Host Details tab



How to Install Nmap(zenmap) in Windows and Linux
Download the Software Form this source:Nmap
How to Install Nmap(zenmap) in Linux RPM

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