Tag: networking

Hide your SSH port from scanners with port knocking. It's not a replacement for security, but it's a valid defense-in-depth tactic.

Your upload works fine locally. It times out through NGINX. The client closes the connection. Here's why.

Set up Chrony for NTP time sync in your home lab. Covers chrony.conf, chronyc tracking, stratum levels, LAN NTP server setup, and why correct time matters more than you think.

You enabled the VPN but half your traffic still bypasses it. Here's why and how routing actually works.

Your backend can't see the client IP because the reverse proxy silently dropped it. Here's why and how to fix it right.

IPv6 isn't just for the future, it's broken on your network right now. Here's why you should care and how to actually set it up.

Your DNS queries go out in plain text, so your ISP logs every site you visit. This covers how DoH, DoT, and DoQ fix that, and how to self-host with AdGuard Home.

You don't need a GUI to see network packets. Learn tcpdump filters, flags, and pcap capture to debug servers from the command line, no Wireshark needed.

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.

Long-lived connections dropping randomly? Your OS is killing them. Here's why keepalives matter and how to tune them.

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.