DNS resolution
Lookups, answers and the difference between a name and a connection.
Notes on small systems.
Short reference notes on Unix, networking and the web. Mostly commands worth remembering, with enough context to read their output.
Reading a routing table
Find the next hop without changing the network configuration.
Service inspection
Read unit status and recent logs before restarting a process.
HTTP response headers
Check a response, follow redirects and interpret cache metadata.