curl and HTTP Debugging Cheat Sheet
Inspect HTTP requests, response headers, redirects, TLS, timing, status failures, JSON payloads, authentication, downloads, retries, and proxies with curl.
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Networking and Connectivity
Diagnose, route, secure, and connect Linux networks and services.
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Networking and Connectivity cheat sheets
Each guide includes copy-ready syntax, detailed examples, and authoritative references.
iproute2 Routing and Traffic Control Cheat Sheet
Inspect and change Linux routes, policy rules, neighbors, links, namespaces, and traffic control with iproute2, rollback planning, and persistent configuration.
Open cheat sheetLinux DNS Resolution and Resolver Tools Cheat Sheet
Diagnose Linux name resolution with getent, dig, resolvectl, NSS, split DNS, resolver caches, and DNSSEC-aware checks without confusing application and DNS paths.
Open cheat sheetLinux Network Diagnostics Cheat Sheet
Diagnose Linux connectivity layer by layer with ip, ping, ss, getent, dig, and curl while separating local, DNS, transport, and HTTP failures.
Open cheat sheetLinux nftables Firewall Cheat Sheet
Inspect, validate, trace, back up, and manage nftables tables, chains, rules, sets, counters, and atomic ruleset changes safely.
Open cheat sheetNetworkManager Wi-Fi and Connections Cheat Sheet
Manage Linux Wi-Fi and NetworkManager connection profiles with nmcli, safe activation, secret handling, routing, DNS, checkpoints, and diagnostics.
Open cheat sheetWireGuard VPN Cheat Sheet
Configure and troubleshoot WireGuard tunnels on Linux with safe key handling, AllowedIPs, routing, firewalls, NAT, MTU, and key rotation.
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