Oct 12, 2019 · The good thing is, we don’t have to worry about this (When to use Stun or Turn) as the evaluation and connection establishment is done automatically for us by WebRTC engine.

Feb 11, 2020 · STUN stands for Session Traversal of User Datagram Protocol, and is usually used indirectly in most WebRTC applications. TURN (Traversal Using Relay NAT) is the more advanced solution that incorporates the STUN protocols and most commercial WebRTC based services uses a TURN server for establishing connections between peers. Jan 06, 2017 · STUN stands for Session Traversal Utilities for NAT. It is a standard method of NAT traversal used in WebRTC. It is defined in IETF RFC 5389. At its core, STUN’s purpose is to answer the question “what is my IP address?” It does that by using a STUN server. In order for a WebRTC client to […] Sep 17, 2013 · To see STUN message details, click on a STUN packet->Session Traversal for NAT->Attributes . Note that a consequence of this simple STUN transaction, is that a public STUN server is a required piece of infrastructure needed for a WebRTC service to work optimally. Since this STUN transaction is fairly lightweight, the cost for this is not huge. ICE uses STUN and/or TURN servers to accomplish this, as described below. STUN Session Traversal Utilities for NAT (STU N ) (acronym within an acronym) is a protocol to discover your public address and determine any restrictions in your router that would prevent a direct connection with a peer. Individual STUN and TURN servers can be added using the Add server / Remove server controls below; in addition, the type of candidates released to the application can be controlled via the IceTransports constraint. If you test a STUN server, it works if you can gather a candidate with type "srflx". WebRTC - Finding a Route - In order to connect to another user, you should find a clear path around your own network and the other user's network. STUN helps to Figure 2. WebRTC Protocol Stack. ICE, STUN, and TURN are necessary to establish and maintain a peer-to-peer connection over UDP. DTLS is used to secure all data transfers between peers, as encryption is a mandatory feature of WebRTC.

Twilio’s Network Traversal Service is a globally distributed STUN/TURN service that helps you deploy more reliable peer-to-peer communications applications. You can use this service in your WebRTC and VoIP applications for traversal and relay around NAT/firewalls, so that your users make a successful connection every time.

STUN+TURN servers list. GitHub Gist: instantly share code, notes, and snippets.

Figure 2. WebRTC Protocol Stack. ICE, STUN, and TURN are necessary to establish and maintain a peer-to-peer connection over UDP. DTLS is used to secure all data transfers between peers, as encryption is a mandatory feature of WebRTC.

STUN, by default, works on UDP ports, not TCP. You could try specifying --protocol tcp on the stunclient command line to see if that makes any difference. But WebRTC only uses the UDP mode. One cheezy idea to try would be to host your own stun server on UDP port 53 (same as DNS) and see if that works. Such failures are a result of network configuration and how WebRTC communicates between clients. Zimbra Connect uses WebRTC, a peer to peer protocol that crosses different networks. Zimbra created this wiki to provide you, our customers, with an overview and guidance for STUN/TURN server implementation. Other WebRTC platforms and service providers provide only short-term, expiring IceServers whose STUN and TURN server credentials allow access for limited time generally 30-60 seconds. This is where STUN (Session Traversal Utilities for NAT) and TURN (Traversal Using Relays around NAT) servers come into play. In order for WebRTC technologies to work, a request for your public-facing IP address is first made to a STUN server. Apr 03, 2017 · STUN and TURN are drastically different from each other. We need both in real production WebRTC services. And we usually think of them of a single server entity deployed in the backend – for STUN we simply don’t fret about the resource needs it has and focus on what we need to get TURN running in scale and in multiple geographical locations.