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STUN and TURN Server

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WebRTC (Web Real-Time Communication) uses both STUN (Session Traversal Utilities for NAT) and TURN (Traversal Using Relays around NAT) servers to facilitate peer-to-peer communication when direct connections are hindered by NAT or firewall configurations.

STUN Server

STUN (Session Traversal Utilities for NAT):

  • Discovers the public IP address and port of a device, which is essential for establishing peer-to-peer connections behind NAT or firewalls.
  • Determines the NAT type, aiding in establishing direct connections when possible.
  • Does not relay media traffic — only assists during initial connection setup.
  • Works best when both peers can communicate directly after discovering their public addresses.

TURN Server

TURN (Traversal Using Relays around NAT):

  • Acts as an intermediary when direct peer-to-peer communication is not possible due to restrictive NAT or firewall configurations.
  • Relays media and data traffic between peers when direct connections fail.
  • Typically used as a fallback when STUN alone cannot establish a direct connection.
  • While STUN discovers public addresses, TURN actively relays traffic, making it more versatile for addressing connectivity issues.

Summary

In WebRTC applications, both STUN and TURN servers can be configured to handle various networking scenarios. These servers are crucial for achieving robust and reliable real-time communication, especially when dealing with the complexities of NAT traversal.