Most networking guides start with acronyms. networks.jelia.nyc starts with what you can see: a packet leaving your laptop, and every hop it takes until it comes back.
It is a visual, hands-on guide in thirteen chapters, built so a curious owner and a seasoned engineer can both get something from it. Every chapter has a narrated walkthrough and an instrument you can poke at, and break, safely.
What it covers
- What a network is, then Ethernet, MAC addresses and switches
- IP addresses and subnets, DHCP and DNS
- TCP, UDP and ports, and your own home network
- NAT, double NAT and CGNAT, and how NAT traversal (STUN, hole punching, relays) gets around them
- Routing tables, longest-prefix match, OSPF and BGP
- VPNs, tunnels and overlays, and a troubleshooting toolkit to close
It is the same knowledge we use every day running mail, sign-on and video for our clients. When something is slow or unreachable, the answer is almost always somewhere in these chapters.
Read it: networks.jelia.nyc