An introduction to Networking with Netcat and NodeJS

Watch on YouTube: youtu.be/iL6fWeJ_FfQ

Here's a quick overview of topics covered in the video:

IP Address

• Like phone numbers or house addresses
• Every computer calls itself localhost which means 127.0.0.1
• Private networks (meaning intranets, NATs) have non-unique addresses
  • 192.168.x.y
  • 10.x.y.z
  • 172.16.x.y to 172.31.x.y
• When no router is available to assign an address, a computer will give itself an address in the 169.x.y.z range
• Laptops, Phones, Printers, etc use can use mDNS and their name to find themselves by name such as ajs-iphone.local or macbook-pro.local

TCP with Netcat

• When you use netcat, there's no magic, it's just stuff going across the wire
• When you use your browser on a netcat server you can see that http isn't crazy magic either
• Two computers can talk to eachother easily
• They can also share files
• All computers can create a connection with a server on the internet
• Computers on the Internet create connections to a computer on an intranet (the address only works one-direction)

Netcat in Node

• The net module handles TCP
• console.log puts an extra newline when it logs things
• The server can handle many clients simultaneously
• The client only speaks to one server
• process.stdin handles input from the terminal

By AJ ONeal


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