Tag: networking

Self-hosted email with Mailcow or Stalwart means daily SPF, DKIM, DMARC, and IP blacklist battles. Here's the honest case against running your own mail server.

Idle SSH sessions and long-lived connections die because the OS gives up first. What the three keepalive sysctls mean, how to tune them, and per-socket options.

Advanced Caddy server configuration: wildcard certs, Caddyfile matchers, Docker label integration, rate limiting, forward auth with Authelia, and the JSON API.

MTU mismatches silently break large file transfers, backups, and video calls. Here's how to find and fix the wrong frame size on your network.

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. The command sequence that finds it: verify the resolver, reach a server, dig the record, trace the query path, check reverse lookups.

Go beyond tailscale up with ACL policies, exit nodes, subnet routers, MagicDNS, and Taildrop. Plus: self-host your own control plane with Headscale.

nmap isn't just for pen testers. Learn what's actually worth scanning on your home network and what those open ports really mean.

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

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