This paper introduces the installation and use of the Nmap network scanning tool under centos.
NMAP is a popular network scanning and sniffing tools is also a powerful tool for port scanning type safety assessment, is widely used in the security scan, NMAP is a useful online tool, also is often used in the production and development, mainly for port open view of detection and LAN information collection, etc., different Linux distributions generally also with NMAP package management tool, can also choose to go to the website to download the source code package compiled installation.
In case, you are unable to use nmap command, use below command to install it
centos：yum install nmap ubuntu：apt-get install nmap
Check that the installation is successful
Nmap usage method
- Scan IP which common TCP port and UDP port are open
nmap 127.0.0.1 or nmap -sS -sU -p 1-65535 127.0.0.1
- Scan multiple IP addresses or subnet
nmap 127.0.0.1 172.16.6.1 nmap 172.16.6.1-100 nmap 172.16.6.0/24
In the scan result, if the state column is open, it means the state is open; if it is filtered, it may be filtered by a firewall; if it is closed, it means the port is closed.
- Scans which hosts are alive in the subnet
nmap -n -sP 172.16.6.0/24
- Nmap route trace
namp –traceroute 220.127.116.11
- Scans IP or subnet hosts for port
nmap -p 12598 127.0.0.1 nmap -p 12598 172.16.6.0/24
- An option that goes one step further and gives you more information about the services running on a specific host is ‘-A’.
nmap -A 127.0.0.1
- Nmap scans the operating system type using the -O option
nmap -O 12598 127.0.0.1
- For an in-depth understanding of the use of the nmap command, use it to examine the man pages
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