Tag: linux

Cisco's OpenH264 download server geoblocks sanctioned regions, breaking Firefox and Flatpak installs. Four practical fixes, ranked simple to nuclear.

Set up a WireGuard VPN kill switch and prevent DNS leaks on Linux. Practical iptables rules, resolv.conf locking, and systemd-resolved config.

Run BGP in your home lab with FRRouting. Covers iBGP vs eBGP, FRR installation, basic BGP config, peering with OPNsense, route filtering, and when BGP is actually worth the complexity.

Suricata beats Snort on multi-threading and EVE JSON logging. Side-by-side IDS/IPS breakdown with Suricata install, suricata.yaml config, and OPNsense setup for home labs.

DNS broke again. Here's the exact command sequence to figure out what's happening without touching a GUI.

Podman skips the root daemon Docker needs. Quadlets let systemd manage containers natively, with auto-updates and health checks, for self-hosting without Compose.

Learn Linux capabilities to drop root privileges without breaking your apps. Master cap_drop, cap_add in Docker, and setcap for fine-grained privilege control.

Master the curl flags that'll save you hours debugging APIs, downloads, and web requests. From -X to --compressed, here's what actually matters.

Named pipes (FIFOs) let you buffer and synchronize between processes. They're underused but solve real problems: queuing, coordination, and complex data flows.

Go beyond ufw allow/deny: rate limiting with ufw limit, logging levels, before.rules for iptables, IPv6 handling, Docker bypass fixes, and fail2ban integration.

Declare, iterate, slice, and manipulate bash arrays safely. Indexed and associative arrays, the @ vs * trap, and patterns that make scripts readable.

Process substitution lets you treat a command's output as a file, and feed input to a command as if it were a file. It's weird but powerful.