Network Encapsulation: Follow a Packet Across the Stack
Follow an HTTPS request from a browser through transport, IP, and link layers, and learn how headers, MTU, routers, and packet captures fit together.
Posts tagged with #networking
Ethernet, ARP, and Neighbor Discovery Explained
Learn how Ethernet frames, switches, VLANs, ARP, and IPv6 Neighbor Discovery deliver packets on a local link, with Linux diagnostics and failure examples.
Forward and Reverse Proxies: Routing, Trust, and Use Cases
Learn how forward and reverse proxies handle HTTP traffic, CONNECT tunnels, TLS termination, caching, routing, trusted headers, and production failures.
IP Routing and NAT: How Packets Cross Networks
Learn how routers choose paths with routing tables, longest-prefix match, and gateways, then see how NAT and port translation change packets at network edges.
IPv4 and IPv6 Addressing: CIDR and Subnetting
Read IPv4 and IPv6 prefixes, calculate subnet membership, plan routes, and avoid CIDR overlap with practical examples in Python and production network design.
Network Observability: Signals for Reliable Services
Track network health across hosts, DNS, paths, proxies, and requests. Learn which signals help diagnose failures without confusing telemetry with service SLOs.
Network Performance: Latency, Throughput, Jitter & Loss
Understand bandwidth, throughput, latency, RTT, jitter, and packet loss with practical measurements, tail percentiles, and production diagnostic guidance.
OSI and TCP/IP Network Models
Compare the OSI and TCP/IP models, trace an HTTPS request through their layers, and use the models to narrow network failures without confusing abstractions.
Packet Capture and Network Troubleshooting: Layered Workflow
Use a layered workflow to diagnose DNS, route, TCP, TLS, and HTTP failures with ping, curl, tcpdump, and Wireshark, then collect useful incident evidence.
TCP Congestion Control: Flow, Loss, and Fairness
Learn how TCP congestion control limits traffic, responds to ACKs and loss, and affects throughput, latency, and fairness, with Linux inspection commands.