Stories and lessons
Practical Networking guides for guides: recognize the symptoms, investigate the cause, and verify the outcome.
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Understand interfaces, frames, namespaces, and loopback, then create two isolated hosts and test how local services behave.
Connect two Linux namespaces with a veth pair, configure IPv4 addresses, inspect routes and ARP, and diagnose a disabled link.
Build a three-host Linux bridge, inspect MAC learning, capture ARP and ICMP, and separate network reachability from listener binding.
Connect two subnets through a Linux router, inspect next hops and packet headers, test return paths, and clean up the cumulative lab.
A four-lesson Linux networking course: start with isolated hosts, connect them, build a switched LAN, and route between subnets.