bash
ip -br addressNotes
A compact everyday networking view.
Linux Networking Admin Cheat Sheet
Comprehensive Linux networking administration reference covering iproute2, DNS, HTTP debugging, TLS, SSH tunnels, packet capture, and firewall inspection.
Export
Copy the compact sheet, download it, or print it.
Download
`D` dense toggle · `C` copy all
Interfaces Routing and Addresses
Inspect and configure interfaces, routes, and gateways.
Show route used for destination
Display which route and source address would be used.
bashLINUXiproutenetwork
bash
ip route get 1.1.1.1Notes
Useful when policy routing or multiple interfaces are involved.
bash
sudo ip link set dev eth0 upNotes
Useful in labs, VMs, and interface recovery steps.
bash
sudo ip addr add 192.168.50.10/24 dev eth0Notes
Temporary until persisted through distro networking config.
bash
sudo ip route add 10.20.0.0/16 via 192.168.50.1Notes
Useful for lab environments and temporary routing changes.
bash
ip neigh showNotes
Useful for local-L2 reachability troubleshooting.
DNS HTTP and Remote Connectivity
Debug name resolution, HTTP, TLS, and remote host access.
bash
dig +trace example.comNotes
Useful when debugging delegation or authoritative-server issues.
bash
dig +short MX example.comNotes
Useful for mail diagnostics.
Verbose HTTP request
Show request/response details and TLS handshake summary.
bashLINUXcurlhttpdebug
bash
curl -v https://example.comNotes
Great for debugging redirects, headers, TLS, and auth.
bash
curl -X POST https://api.example.com/items -H 'Content-Type: application/json' -d '{"name":"demo"}'Notes
Useful for quick API testing without a GUI client.
bash
openssl s_client -connect example.com:443 -servername example.comNotes
A go-to tool for TLS debugging and certificate inspection.
Create local SSH port forward
Forward a local port to a remote host/port through SSH.
bashLINUXsshtunnelport-forward
bash
ssh -L 5433:127.0.0.1:5432 user@db-bastionNotes
Useful for securely reaching private services like databases.
bash
ssh-copy-id user@server.example.comNotes
Simplifies passwordless SSH setup.
Traffic Capture and Firewall Inspection
Capture packets and inspect firewall state.
Capture traffic on interface
Capture packets on a specific interface.
bashLINUXtcpdumpcapturenetwork
bash
sudo tcpdump -i eth0Notes
Start broad, then add host, port, or protocol filters.
Capture traffic by host and port
Limit packet capture to a host and service port.
bashLINUXtcpdumpcapturenetwork
bash
sudo tcpdump -i any host 10.0.0.10 and port 443Notes
Useful for focusing on one problematic connection.
bash
sudo iptables -L -n -vNotes
Common on older systems and container hosts.
bash
sudo nft list rulesetNotes
Modern Linux firewall inspection on nft-based systems.
bash
sudo ufw status verboseNotes
Common on Ubuntu servers and personal Linux systems.
bash
sudo firewall-cmd --list-allNotes
Useful on RHEL-family systems that use firewalld.
More in Linux
Linux Permissions and Security Cheat Sheet
High-value Linux permissions and security reference covering users, sudo, ACLs, special mode bits, SSH access, SELinux, and AppArmor basics.
Linux Shell Scripting Cheat Sheet
High-value Linux shell scripting reference covering variables, expansion, conditionals, loops, functions, redirection, pipelines, traps, getopts, and script debugging.
Linux Package Management Cheat Sheet
Comprehensive Linux package management reference for apt, dnf, yum, pacman, zypper, rpm, and dpkg workflows across common distributions.
Linux Command Cheat Sheet
Comprehensive Linux command reference covering navigation, files, text processing, permissions, processes, system information, networking, archives, services, storage, and troubleshooting.
Recommended next
Bash Scripting Patterns and Practical Recipes
BASH
Production-minded Bash script patterns for files, arguments, parsing, temp files, logging, retries, and common automation tasks.
Bash Builtins, Job Control, and Shell Behavior
BASH
Core Bash builtins, shell options, history, aliases, job control, traps, and interactive-shell behavior.
Bash Arrays, Strings, and Text Handling
BASH
Indexed and associative arrays, string handling, read/mapfile, and common Bash text-processing patterns.
Bash Conditionals, Loops, and Functions
BASH
Bash if/elif/case logic, test expressions, loops, functions, return codes, and robust control-flow patterns.
Bash Variables, Quoting, and Expansion
BASH
Bash variables, parameter expansion, quoting rules, command substitution, arithmetic, and shell expansion patterns.
Bash Cheat Sheet
BASH
Comprehensive Bash commands, shell syntax, quoting, variables, redirection, pipelines, and day-to-day scripting patterns.