Connecting two COTURN servers for seamless communication

Currently, I have a total of 5 webRTC peers connected through the COTURN server (turnServer1). These peers are all behind symmetric NAT, requiring the use of the TURN server to establish connections. However, due to the media streams with audio and video being sent between peers, the TURN server is reaching its bandwidth limit and I am unable to add more peers to the conversation. The network structure looks like this: https://i.sstatic.net/UKdoF.jpg

If the network were to include 10 peers, each consuming around 100kB/s of bandwidth, the TURN server would need to handle 10^10 * 100kB/s = 10000kb/s. With an increase to 100 peers, this number would rise to 1000000Kb/s. My goal is to transform this webRTC peer-to-peer network into something similar to this: https://i.sstatic.net/VgQpI.jpg

By implementing such a network architecture, the burden on the TURN server's bandwidth can be reduced by almost half. I'm wondering if it's possible to achieve this and if so, how could it be done?

Any assistance would be greatly appreciated!

javascriptwebrtcturncoturn

Answer №1

If you have two peers connected to different TURN servers (like peer 3 and peer 10 in the example), there's no need for any special actions because TURN appears as plain UDP to the other side. This means turnServer1 doesn't even realize it's communicating with turnServer2 instead of a peer directly.

For this type of setup, you may want to consider using an SFU (selective forwarding unit) instead of a p2p/full mesh configuration with TURN servers.

Answer №2

According to Philipp, you don't need to do much as the TURN (relay) will act as your intermediary for connecting with other peers.

This resource (page 9), sourced from this GitHub discussion, provides a clear explanation:

In order to set up a WebRTC session, peers must exchange an SDP offer and answer. The SDP offer contains ICE candidates which describe how each peer can communicate. To gather these candidates, peers send requests to STUN servers to obtain their public IP address and port information. This process is known as ICE candidate gathering. Once a peer has gathered its ICE candidates, it shares them along with its SDP to the receiving peer through the signaling channel. The receiving peer then responds with its own SDP answer and ICE candidates. Peers then conduct connectivity checks based on priority of ICE candidates to establish a valid connection. If no valid connection is found, a peer can request a media relay address from the TURN server. This relay address is added to the candidate list and exchanged through the signaling channel.

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