Linux network tools

Networking tools

• ping
• curl
• httpie
• wget: download files
• tc
• dig / nslookup
• whois: check domain registered
• ssh: secure shell
• scp: copy files (over ssh)
• rsync: copy only changed files (over ssh)
• ngrep: grep ur network
• tcpdump: show me all packets on port 80
• wireshark
• tshark
• tcpflow
• ifconfig: what is my IP address
• route: view for change the route table
• ip: replace ifconfig, route, ...
• arp: see ARP table
• mitmproxy: spy on SSL connections ur programs r making
• nmap: scanning ports
• zenmap: GUI for nmap
• p0f: identify OS of hosts connecting to you
• openvpn: a VPN
• wireguard: newer VPN
• nc: netcat, make TCP connections manually
• socat: proxy a TCP socket to a unit domain socket ...
• telnet: like ssh but insecure
• fpt / sftp: copy files
• netstat / ss / lsof / fuser: what ports are servers using
• iptables: setup firewalls & NAT
• nftables: new version of iptables
• hping 3: construct any TCP packet u want
• traceroute / mtr: what servers are on the way to that server
• tcptraceroute: use tcp packets instead of icmp to traceroute
• ethtool
• iw / iwconfig
• sysctl
• openssl: do literally anything with SSL certificates
• stunnel: make a SSL proxy for an insecure server
• iptraf / nethogs / iftap / ntap
• ab / nload / iperf: benchmarking tools
• ipcalc
• nsenter: enter a container process's network namespace

Find & kill Process Id

Way 1: Using fuser

fuser -k 80/tcp

• -k: kill

Way 2: Using fuser

pid=$(lsof -t -i :80) && kill $pid

• -t: TCP connections
• -i: filter

It's recommended to use the first method (fuser -k 80/tcp) as it directly terminates the process. The second method might require additional parsing depending on the output of lsof.