Networking notes
Practical notes on DNS, TLS, nginx and running small Linux servers. Each article explains what actually happens on the wire, with commands you can run yourself.
How DNS resolution works
From the stub resolver to recursive servers and authoritative zones.
The TLS 1.3 handshake
What is sent in clear text, what is encrypted, and why it takes one round trip.
nginx as a TLS terminator
Server blocks, certificates, and a safe way to reload the configuration.
Hardening SSH on a fresh server
Keys first, password login last, and how to avoid locking yourself out.