networks.jelia.nyc
How the internet actually moves your data
Every message you send is chopped into packets, stamped with addresses, rewritten by routers you've never heard of, and passed hand to hand across the planet in a few milliseconds. This site is a visual, hands-on guide to how that works, from the cable behind your desk to the routing tables that hold the internet together.
No networking background needed. It starts with what a packet is, works up through the box under your TV, and goes as deep as NAT traversal and BGP if you want to follow it there.
WatchEach chapter opens with a short narrated walkthrough. Press play, sound on.
PlayInstruments you can poke and break: a subnet calculator, a live NAT table, a router that picks routes, a traceroute you can run.
ReadPlain-English sections, with "go deeper" panels for the protocol details when you want them.
Start here · chapter 01What a network is
Bits, packets and the layer cake: how a message becomes something a wire can carry.
Why this site exists · chapter 13Why a remote desktop got slow: a real case, solved
Twelve network adapters, a router behind a router, and a connection quietly falling back to a relay, traced tool by tool.