bashLINUXiplinkinterfaces
bash
ip link showList network links and their state.
Linux Networking Cheat Sheet
Comprehensive Linux networking commands for interfaces, sockets, packet capture, and throughput testing.
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Interfaces and Addresses
Inspect links, IP addresses, MTU, and interface state.
bashLINUXipaddressinterfaces
bash
ip addr showDisplay IPv4 and IPv6 addresses on all interfaces.
bashLINUXipaddressinterface
bash
ip addr show dev eth0Inspect addresses for a specific device.
bashLINUXiplinkup
bash
sudo ip link set dev eth0 upEnable a network interface.
bashLINUXiplinkdown
bash
sudo ip link set dev eth0 downDisable a network interface.
bashLINUXipaddressconfigure
bash
sudo ip addr add 192.168.1.10/24 dev eth0Assign an additional IP address to an interface.
bashLINUXipaddressconfigure
bash
sudo ip addr del 192.168.1.10/24 dev eth0Remove an IP address from an interface.
bashLINUXipmtuperformance
bash
sudo ip link set dev eth0 mtu 9000Change interface MTU size.
bashLINUXethtoolniclink
bash
sudo ethtool eth0Display link speed, duplex, and driver information.
bashLINUXethtoolstatsnic
bash
sudo ethtool -S eth0Display per-interface statistics exposed by the driver.
bashLINUXnmclinetworkmanagerinterfaces
bash
nmcli device statusList devices managed by NetworkManager and their states.
bashLINUXhostnameipquick-reference
bash
hostname -IPrint IP addresses assigned to the local host.
Sockets and Connections
Inspect listening ports, established sessions, and owning processes.
bashLINUXsstcpports
bash
ss -ltnpList listening TCP sockets with names.
bashLINUXssudpports
bash
ss -lunpList listening UDP sockets with names.
bashLINUXsstcpconnections
bash
ss -tp state establishedDisplay established TCP sessions.
bashLINUXssportfilter
bash
ss -ltnp '( sport = :443 )'Find sockets using a specific local port.
bashLINUXlsofportsprocess
bash
sudo lsof -iTCP:8080 -sTCP:LISTEN -n -PFind which process owns a TCP port.
bashLINUXlsofnetworkinspect
bash
sudo lsof -i -n -PList network connections for all processes.
bashLINUXfuserportprocess
bash
sudo fuser 5432/tcpIdentify processes using a TCP port.
bashLINUXnctcpconnectivity
bash
nc -vz example.com 443Check whether a remote TCP port is reachable.
bashLINUXnclistenertest
bash
nc -lv 9000Open a simple TCP listener for testing.
bashLINUXsocatport-forwardtest
bash
socat TCP-LISTEN:8080,fork TCP:127.0.0.1:80Create a TCP port forward with socat.
bashLINUXwatchssmonitoring
bash
watch -n 2 'ss -s; echo; ss -ltnp'Refresh socket view every 2 seconds.
Packet Capture and Throughput
Capture packets and benchmark throughput.
bashLINUXtcpdumpcaptureinterface
bash
sudo tcpdump -i eth0Capture packets on a specific network interface.
bashLINUXtcpdumpportcapture
bash
sudo tcpdump -i any tcp port 443Capture traffic for a single TCP port.
bashLINUXtcpdumphostcapture
bash
sudo tcpdump -i any host 10.0.0.5Capture traffic to or from a host.
bashLINUXtcpdumppcapcapture
bash
sudo tcpdump -i any -w capture.pcapSave a capture to a file for Wireshark analysis.
bashLINUXtcpdumppcapread
bash
tcpdump -nn -r capture.pcapInspect a saved packet capture file.
bashLINUXmtrlatencypath
bash
mtr example.comContinuously test latency and path quality.
bashLINUXiperf3throughputserver
bash
iperf3 -sStart a throughput test server.
bashLINUXiperf3throughputclient
bash
iperf3 -c 10.0.0.10Benchmark throughput to a remote host.
bashLINUXiperf3throughputreverse
bash
iperf3 -c 10.0.0.10 -RMeasure reverse-direction throughput.
bashLINUXpingstressicmp
bash
sudo ping -f 10.0.0.10Use with care on controlled networks only.
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