WebRTC

Agenda

• WebRTC Overview
• WebRTC Demystified
  • NAT
  • STUN
  • TURN
  • ICE
  • SDP
  • Signaling the SDP
• Demo
• WebRTC Pros & Cons
• Few more thing.....

Overview

• Stands for Web Real-Time Communication
• Find a peer to peer to exchange video and audio in an efficient and low latency manner
• Standardized API
• Enables rich communications broswers, mobile, IOT devices

What exactly happens in WebRTC:

• A wants to connect to B.
• A finds out all possible ways the public can connect to it.
• B finds out all possible waus the public can connect to it.
• A & B signal this session information via other means, like:
  • WhatsApp
  • QR
  • Tweet
  • Websockets
  • HTTP Fetch, etc
• A connects to B via the most optimal path.
• A & B also exchanges their supported media and security.

Once they find the way:

WebRTC Demystified

• NAT - Network Address Translation

• NAT Translations Methods

  • One to One NAT (Full-cone NAT
  • Address restricted NAT
  • Port restricted NAT
  • Symmetric NAT

  One to One NAT (Full cone NAT)

  • Packets to external IP:port on the router alwasys maps to internal IP:port without exceptions.

  

  Example: