Linux networking commands and their explanation

arp - see your arp table

Address resolution protocol used to translate between Layer 2 MAC addresses and Layer 3 IP addresses

Note:- If you don't have the arp command use this "sudo apt install net-tools"

aria2 – downloading just about everything. Torrents included

The aria2 is a tool that allows downloading files via the command line using various protocols such as HTTP, HTTPS, FTP, SFTP, BitTorrent, and Metalink. This tool resumes incomplete download where it stopped.

Note:- If you don't have the aria2 "sudo apt update"

sudo apt install -y aria2

After the installation is completed, aria2 will be available as aria2c command. We can check the version

aria2c --version

Testing aria2

aria2c http://ipv4.download.thinkbroadband.com/100MB.zip

The -o the option allows specifying the filename for the downloaded file.

aria2c -o test.zip http://ipv4.download.thinkbroadband.com/100MB.zip

Uninstall aria2

If you want to completely remove aria2 and related dependencies, execute the following command:

sudo apt purge --autoremove -y aria2

arpwatch

Ethernet Activity Monitor

/etc/rc.d/init.d/arpwatch : The arpwatch service for start or stop daemon.
/etc/sysconfig/arpwatch : This is main configuration file…
/usr/sbin/arpwatch : Binary command to starting and stopping tool via the terminal.
/var/arpwatch/arp.dat: This is the main database file where IP/MAC addresses are recorded.
/var/log/messages: The log file, where arpwatch writes any changes or unusual activity to IP/MAC.