Source: https://haydenjames.io/linux-networking-commands-scripts/
	
	
arpwatch – Ethernet Activity Monitor.
bmon – bandwidth monitor and rate estimator.
bwm-ng – live network bandwidth monitor.
curl – transferring data with URLs. (or try httpie)
darkstat – captures network traffic, usage statistics.
dhclient – Dynamic Host Configuration Protocol Client
dig – query DNS servers for information.
dstat – replacement for vmstat, iostat, mpstat, netstat and ifstat.
ethtool – utility for controlling network drivers and hardware.
gated – gateway routing daemon.
host – DNS lookup utility.
hping – TCP/IP packet assembler/analyzer.
ibmonitor – shows bandwidth and total data transferred.
ifstat –  report network interfaces bandwidth.
iftop – display bandwidth usage.
ip (PDF file) – a command with more features that ifconfig (net-tools).
iperf3 – network bandwidth measurement tool. (above screenshot Stacklinux VPS)
iproute2 – collection of utilities for controlling TCP/IP.
iptables – take control of network traffic.
IPTraf – An IP Network Monitor.
iputils – set of small useful utilities for Linux networking.
iw – a new nl80211 based CLI configuration utility for wireless devices.
jwhois (whois) – client for the whois service.
“lsof -i” – reveal information about your network sockets.
mtr – network diagnostic tool.
net-tools – utilities include: arp, hostname, ifconfig, netstat, rarp, route, plipconfig, slattach, mii-tool, iptunnel and ipmaddr.
ncat – improved re-implementation of the venerable netcat.
netcat – networking utility for reading/writing network connections.
nethogs – a small ‘net top’ tool.
Netperf – Network bandwidth Testing.
netsniff-ng – Swiss army knife for daily Linux network plumbing.
netstat – Print network connections, routing tables, statistics, etc.
netwatch – monitoring Network Connections.
ngrep – grep applied to the network layer.
nload – display network usage.
nmap – network discovery and security auditing.
nmcli – a command-line tool for controlling NetworkManager and reporting network status.
nmtui – provides a text interface to configure networking by controlling NetworkManager.
nslookup – query Internet name servers interactively.
ping – send icmp echo_request to network hosts.
route – show / manipulate the IP routing table.
slurm – network load monitor.
snort – Network Intrusion Detection and Prevention System.
smokeping –  keeps track of your network latency.
socat – establishes two bidirectional byte streams and transfers data between them.
speedometer – Measure and display the rate of data across a network.
speedtest-cli – test internet bandwidth using speedtest.net
ss – utility to investigate sockets.
ssh –  secure system administration and file transfers over insecure networks.
tcpdump – command-line packet analyzer.
tcptrack – Displays information about tcp connections on a network interface.
telnet – user interface to the TELNET protocol.
tracepath – very similar function to traceroute.
traceroute – print the route packets trace to network host.
vnStat – network traffic monitor.
websocat – Connection forwarder from/to web sockets to/from usual sockets, in style of socat.
wget –  retrieving files using HTTP, HTTPS, FTP and FTPS.
Wireless Tools for Linux – includes iwconfig, iwlist, iwspy, iwpriv and ifrename.
Wireshark – network protocol analyzer.