In this tutorial, How to use NMAP Security Scanner on Linux. How to scan port, service name and ping v.v to target. Now, let’s go use nmap command in Linux.
Install Nmap
CentOS
$ sudo yum install nmap.
Debian
$ sudo apt-get install nmap.
Ubuntu
$ sudo apt-get install nmap.
Syntax use nmap command
nmap [Scan Type] [Options] {Target}
Target
For example, Domain: www.huuphan.com, www.devopsroles.com. IP Address: 192.168.1.4, 10.0.0-255.1-254
Scan Type
-sL: List Scan -- simply list targets to scan -sn: Ping Scan -- disable port scan -sP: Ping Scan -- go no further than determining if host is online -sS/sT/sA/sW/sM: TCP SYN/Connect()/ACK/ Window/Maimon scans -sV: Probe open ports to determine service/version info -sU: UDP Scan -sO: IP protocol scan -- ICMP,EIGRP, -b: FTP bounce scan -n/-R: Never do DNS resolution/Always resolve[default: sometimes]
Options
-p: Only scan specified ports -O: Enable OS detection -P0: Treat all hosts as online -- skip host discovery -e: Use specified interface
nmap command examples
Scan port
# all ports
$ nmap -v -PO www.huuphan.com
# speified port only
$ nmap -v -PO -p 22 192.168.1.0/24
# post scan & service name
$ nmap -v -sV 192.168.1.110ping scan
$ nmap -v -sn 192.168.1.0/24Check OS of specified IP
$ nmap -A 192.168.1.110Nmap option –traceroute to trace the route from the scanning machine to the target host
$ nmap -Pn --traceroute -p 443 www.huuphan.comConclusion
Nmap command is a simple command in Linux. It is tips and tricks for troubleshooting Linux. Thank you for reading the DevopsRoles page!
