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nmap


Nmap (Network Mapper) is a tool for scanning and analysing hosts in a network.

Nmap is a powerful portscanner, one of the most important tools for a network administrator. It is able to find open ports on hosts and can identify an operating system, including the version of the OS and some components.

Installation

You can install nmap with Pakfire or on the shell with the command:

pakfire install -y nmap

Handling

Nmap can only be used on the shell, so I want to show you some commands and examples.

The "standard-scan" will scan every port from 1 to 1024 (e.g. on host 192.168.0.1):

nmap 192.168.0.1

The output is similar to this:

[root@ipfire ~]# nmap 192.168.0.1
Starting Nmap 7.70 ( https://nmap.org ) at 2019-02-04 14:51
Nmap scan report for pi.localdomain (192.168.0.1)
Host is up (0.00073s latency).
Not shown: 996 filtered ports
PORT     STATE  SERVICE
22/tcp   open   ssh
80/tcp   open   http
443/tcp  closed https
8080/tcp open   http-proxy
MAC Address: B8:27:EB:xx:xx:x (Raspberry Pi Foundation)

Nmap done: 1 IP address (1 host up) scanned in 18.66 seconds

If you want to lookup for port 80, because maybe there is a webservice offered:

nmap -p 80 192.168.0.1

To scan a handfull of ports use:

nmap -p 20,21,80 192.168.0.1

To scan a port range use:

nmap -p 80-90 192.168.0.1

You also can scan more than one host:

nmap -p 80 192.168.0.1,2,3,4 resp. # nmap -p 80 192.168.0.1-4

Settings for ports are the same as above.

As I already told nmap can be used for OS-fingerprinting, to use this feature you have to add -O to your scan command:

nmap -O 192.168.0.1

As example, the output of a scan from IPfire:

Starting Nmap 4.60 ( http://nmap.org ) at 2008-11-04 17:46 CET
Interesting ports on 192.168.0.1:
Not shown: 1711 closed ports
PORT    STATE SERVICE
53/tcp  open  domain
81/tcp  open  hosts2-ns
222/tcp open  rsh-spx
444/tcp open  snpp
MAC Address: 00:XX:XX:XX:XX:XX (Allied Telesyn Internaional)
Device type: testfire
Running: IPCop Linux 2.4.X
OS details: IPCop firewall 1.4.10 - 1.4.15 (Linux 2.4.31 - 2.4.34)
Network Distance: 1 hop

Nmap is a very powerfull tool and a lot of people have allready written quite good documents how to use it. So I want to refer you to this pages here:

HowTo from Stefano Albrecht

actual list of port numbers

Trojans Port List

github - nmap

Edit Page ‐ Yes, you can edit!

Older Revisions • Friday at 6:50 am • Erik Kapfer