Networking · 4 min read
Understanding TCP Connections
Follow a TCP connection from its handshake to its final acknowledgment, and learn what throughput measurements can actually tell you.
The notebook
Notes
Clear explanations, concrete examples and the limits that matter.
12 notes
Linux · 4 min read
Running a small Linux service with systemd
Build a readable service unit, distinguish process startup from readiness, and verify safe operational behavior.
Web · 5 min read
Reverse Proxies Explained
Trace requests through a reverse proxy and understand the separate decisions around upstreams, headers, streaming, and failures.
Networking · 5 min read
Reading Traceroute Results
Learn what hop timings reveal, why missing replies can be harmless, and how to turn route output into careful network evidence.
Web · 4 min read
Reading HTTP status codes as operational signals
Understand what a response code establishes, how intermediaries affect it, and when a client can retry safely.
Security · 5 min read
Practical TLS Certificates
Connect certificate validation, automated issuance, and renewal monitoring into a clear operational workflow.
Operations · 4 min read
Monitoring a small Linux server with useful signals
Choose a compact set of service and resource measurements, interpret pressure correctly, and keep alerts actionable.
Networking · 4 min read
IPv4 subnets and CIDR in everyday operations
Read prefix lengths, calculate subnet boundaries, and avoid assumptions about routing, private addresses, and usable hosts.
Networking · 5 min read
How DNS Resolution Works
Understand resolvers, authoritative servers, caching, and the practical checks that make DNS failures easier to explain.
Web · 5 min read
HTTP/2 vs HTTP/3
Compare the transport choices behind modern HTTP and design tests that separate protocol effects from changing network conditions.
Networking · 4 min read
Diagnosing packet loss without blaming the wrong hop
A practical method for separating endpoint loss, filtered probes, local interface drops, and TCP recovery.
Networking · 4 min read
Bandwidth, throughput, and latency describe different limits
Use capacity, delivered rate, delay, and variation together when evaluating a network for interactive or streaming workloads.
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