CEH: Identifying Services & Scanning Ports | Gathering Network And Host Information | NMAP

CEH scanning methodology is the important step i.e. scanning for open ports over a network. Port is the technique used to scan for open ports. This methodology performed for the observation of the open and close ports running on the targeted machine. Port scanning gathered a valuable information about  the host and the weakness of the system more than ping sweep.

Network Mapping (NMAP)

Basically NMAP stands for Network Mapping. A free open source tool used for scanning ports, service detection, operating system detection and IP address detection of the targeted machine. Moreover, it performs a quick and efficient scanning a large number of machines in a single session to gathered information about ports and system connected to the network. It can be used over UNIX, LINUX and Windows.

There are some terminologies which we should understand directly whenever we heard like Open ports, Filtered ports and Unfiltered ports.

Open Ports means the target machine accepts incoming request on that port cause these ports are used to accept packets due to the configuration of TCP and UDP.

Filtered ports means the ports are usually opened but due to firewall or network filtering the nmap doesn't detect the open ports.

Unfiltered means the nmap is unable to determine whether the port is open or filtered  while the port is accessible.

Types Of NMAP Scan

Scan Type	Description
Null Scan	This scan is performed by both an ethical hackers and black hat hackers. This scan is used to identify the TCP port whether it is open or closed. Moreover, it only works over UNIX  based systems.
TCP connect	The attacker makes a full TCP connection to the target system. There's an opportunity to connect the specifically port which you want to connect with. SYN/ACK signal observed for open ports while RST/ACK signal observed for closed ports.
ACK scan	Discovering the state of firewall with the help ACK scan whether it is stateful or stateless. This scan is typically used for the detection of filtered ports if ports are filtered. Moreover, it only works over the UNIX based systems.
Windows scan	This type of scan is similar to the ACK scan but there is ability to detect an open ports as well filtered ports.
SYN stealth scan	This malicious attack is mostly performed by attacker to detect the communication ports without making full connection to the network. This is also known as half-open scanning.

 

All NMAP Commands 

Commands	Scan Performed
-sT	TCP connect scan
-sS	SYN scan
-sF	FIN scan
-sX	XMAS tree scan
-sN	Null scan
-sP	Ping scan
-sU	UDP scan
-sO	Protocol scan
-sA	ACK scan
-sW	Window scan
-sR	RPC scan
-sL	List/DNS scan
-sI	Idle scan
-Po	Don't ping
-PT	TCP ping
-PS	SYN ping
-PI	ICMP ping
-PB	ICMP and TCP ping
-PB	ICMP timestamp
-PM	ICMP netmask
-oN	Normal output
-oX	XML output
-oG	Greppable output
-oA	All output
-T Paranoid	Serial scan; 300 sec between scans
-T Sneaky	Serial scan; 15 sec between scans
-T Polite	Serial scan; .4 sec between scans
-T Normal	Parallel scan
-T Aggressive	Parallel scan, 300 sec timeout, and 1.25 sec/probe
-T Insane	Parallel scan, 75 sec timeout, and .3 sec/probe

 

How to Scan

You can perform nmap scanning over the windows command prompt followed by the syntax below. For example, If you wanna scan the host with the IP address 192.168.2.1 using a TCP connect scan type, enter this command:

nmap 192.168.2.1 –sT

nmap -sT 192.168.2.1

Related word

1. Hack Tools Online
2. Hacker Tools 2020
3. Pentest Tools Apk
4. Hacker Tools For Mac
5. Tools Used For Hacking
6. Hack Tools
7. Free Pentest Tools For Windows
8. Bluetooth Hacking Tools Kali
9. Pentest Tools For Mac
10. Hacking Tools 2020
11. Physical Pentest Tools
12. Growth Hacker Tools
13. Hacker Tools Linux
14. Pentest Tools Open Source
15. Hacking Tools For Windows Free Download
16. Hacker Tools Free Download
17. Hacker Tools For Pc
18. What Is Hacking Tools
19. What Are Hacking Tools
20. Blackhat Hacker Tools
21. Hacking Tools Windows
22. Hacker Search Tools
23. Install Pentest Tools Ubuntu
24. Hack Website Online Tool
25. Pentest Tools Alternative
26. Pentest Tools For Windows
27. Pentest Tools Alternative
28. Hacking Tools For Beginners
29. Github Hacking Tools
30. Black Hat Hacker Tools
31. Hacking Tools Download
32. What Is Hacking Tools
33. Usb Pentest Tools
34. Pentest Tools Port Scanner
35. How To Install Pentest Tools In Ubuntu
36. Hack App
37. Hacker Tools Apk Download
38. Pentest Tools Apk
39. Pentest Tools Online
40. Hacker Tools 2020
41. How To Make Hacking Tools
42. Hacker Security Tools
43. Pentest Reporting Tools
44. Hack And Tools
45. Hacker Tools Github
46. Pentest Tools Nmap
47. Hacker Tool Kit
48. Termux Hacking Tools 2019
49. Tools 4 Hack
50. Hack App
51. New Hack Tools