nmap on linux | Techtimejourney

From time to time you might need to scan your network for router or device ip addresses. This can be easily done with nmap.

sudo apt-get install -nmap -y

Once you are done installing, you can run something like this:

nmap -sn 11.1.1.0/24

Replace 11.1.1 with the details of your actual ip. Keep the ending similar to 0/24 – you will want to scan the entire address range.

Nmap will now print something like this:

Starting Nmap 7.40 ( https://nmap.org ) at 2019-03-03 12:40 UTC
Nmap scan report for xxx (xxx.xxx.x.xxx)
Host is up (0.0035s latency).
Nmap scan report for something.localdomain (xxx.xxx.x.xxx)
…
Nmap done: xxx IP addresses (x hosts up) scanned in x.xx seconds

The output, similar to the above, should get you started on the road of discovering your devices. Note. Eventhough nmap is a poweful tool it will only tell you the address of your router/device where other devices on your network connect to. If you need more information you might use something like Wireshark. Currently, you would need to install Wireshark from source code – if you are using Linux.

For this tutorial I have the following setup: my desktop client is PostX Gnu/Linux(Debian based) and my server machine is Lubuntu´s latest image (as it was during October 2017).

SSH is a secure shell network protocol, which let’s you to form a connection from one computer to another securely over the network. SSH can be used to access remote devices, which are online somewhere but you can also use SSH to access devices on your LAN(devices like Raspberry PI).

We will be using OpenSSH. It comes in two parts: it has the client and the server. You need to install the server part to the machine that you want to access and the client part to the computer(s) accessing the server.

On Debian based systems this is usually as easy as: Continue reading →

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Using nmap to scan network for devices