Your secret spy resident for Linux, web server and hardware

Using netstat utility in Linux it is possible to see not only opened connections, but also to see which ports are open at current connection.

To do so, type: netstat –nap

use netstat –help for more information.

To check open ports on your Linux system you will need following package: nmap

Debian/Ubuntu got his package in standard repository already for ages.
Installing the nmap.

To have simple check play with your local host IP, usually it’s 127.0.0.1.  To do so, type: nmap -sS -O 127.0.0.1

In this example it’s clear which port are open:

22/tcp    open  ssh
139/tcp   open  netbios-ssn
445/tcp   open  microsoft-ds
3306/tcp  open  mysql
10000/tcp open  snet-sensor-mgmt