TCP IP header flags list

MODULE 5:- Scanning Network and Vulnerability

  1. Introduction of port Scanning – Penetration testing
  2. TCP IP header flags list
  3. Examples of Network Scanning for Live Host by Kali Linux
  4. important nmap commands in Kali Linux with Example
  5. Techniques of Nmap port scanner – Scanning
  6. Nmap Timing Templates – You should know
  7. Nmap options for Firewall IDS evasion in Kali Linux
  8. commands to save Nmap output to file
  9. Nmap Scripts in Kali Linux
  10. 10 best open port checker Or Scanner
  11. 10 hping3 examples for scanning network in Kali Linux
  12. How to Install Nessus on Kali Linux 2.0 step by step
  13. Nessus scan policies and report Tutorial for beginner
  14. Nessus Vulnerability Scanner Tutorial For beginner

What is TCP IP header?

TCP IP header refers Transmission control Protocol is responsible to make communication between  devices and send data over network. It provides reliable, ordered and error check comunications. Major internet application rely on by this protocol such as World wide web, email, remote adminsitration, file transfer etc. Applications that don’t require reliableity use UDP (User Datagram Protocol).

  • TCP has main operations at the time of communication:
  • Establish connections
  • Terminate connections
  • Reliable Transmission
  • Error Detection and check sum
  • Flow Control
  • Congestion control
  • Decide maximum segment size
  • Acknowledgment of transfer data
  • Forcing data delivery

And these operations handled by TCP IP header Communication flags. There are six type of Flags used by TCP

URG (Urgent)
Data with this flag should be processed immediately
FIN (finish)
this flag tell there is no more data remain for transmission on remote system
RST (Reset)
It is used to reset the connection
PSH (Push)
It is used to instruct to send all buffered data immendiately to the recieving system
ACK (Acknowledgement)
Used acknowledge the receipt data packets
SYN (Synchronize)
It is used to initiate the a connection between the hosts

To know More : Packetcrafter

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