Why do I need a STUN server?
The reason to have a STUN server is so that the two peers can send the media to each other. The media streams will not hit your signalling server but instead will go straight to the other party(the definition of a peer-to-peer connection), the exception to this would be the case when a TURN server is used.
The STUN server allows clients to find out their public address, the type of NAT they are behind and the Internet side port associated by the NAT with a particular local port. This information is used to set up UDP communication between the client and the VoIP provider to establish a call.
For most WebRTC applications to function a server is required for relaying the traffic between peers, since a direct socket is often not possible between the clients (unless they reside on the same local network). The common way to solve this is by using a TURN server.
A STUN server allows a computer on the internet to determine its own public-facing IP address. STUN uses UDP, and STUN servers typically listen for UDP requests on port 3478. For a client to use STUN, their network must allow UDP traffic.
To build the list of ICE candidates, Alice's browser makes a series of requests to a STUN server. The server returns the public IP address and port pair that originated the request.
WhatsApp is a popular messaging and voice over IP (VoIP) service owned by Facebook. The WhatsApp STUN protcol detects messages and notifications.
Apple's FaceTime is based on standards such as STUN and H. 264, but also includes unique features.
webrtc peer to peer chat without signaling server
a turn server is never used. since no signaling server is used the negotiation has to be done manually. that means a so called "offer" has to be copied from the initiator to the responder. and the "answer" has to be copied from the responder to the initiator.
- Step 1: Firewall rules to Open ports: ...
- Step 2: Coturn installation. ...
- Step 3: Start the Coturn Daemon at Startup. ...
- Step 4: Create a TURN user to Next, edit the main configuration file. ...
- Step 5: Restart the Coturn Service. ...
- Step 6: Testing Time.
The Google STUN server is something you can freely use for development purposes, but, as a free service, there is no SLA. If you are deploying a commercial application, you should plan to deploy your own STUN/TURN servers.
What is Cisco STUN?
Simple Traversal of UDP through NATs (STUN), is a network protocol allowing a client behind a NAT (Network Address Translator) to find out its public address, the type of NAT it is behind and the internet-side port associated by the NAT with a particular local port.
STUN. Session Traversal Utilities for NAT (STUN) is a protocol to discover your public address and determine any restrictions in your router that would prevent a direct connection with a peer.
TURN is a relay — both clients send data to the TURN server, which forwards it to the other client. STUN is not a relay — the STUN server helps to "make the connection" between the clients (by discovering and exchanging their external host:port pairs), after which they send data to each other directly.
Free and public Session Traversal Utilities for NAT server
There are various free STUN servers available out there. It is lightweight and carry no real authentication mechanism to it. This makes it simple for developers to connect to freeservers without any technical hurdles. It is not advisable to do so.
STUN is a tool used by other protocols, such as Interactive Connectivity Establishment (ICE), the Session Initiation Protocol (SIP), and WebRTC.
A server using the STUN protocol will rely on both UDP and TCP protocols. These servers usually listen on port 3478. It's common for clients to contact STUN servers on specific IPs and ports (i.e., 3478). However, these servers can hint the client to perform tests on alternate port number and IP addresses.
Facebook Messenger
Messenger uses port 3478 for STUN, TURN over UDP on port 40002, TURN over TCP on port 3478.
Find IP Address on WhatsApp via InspectLet
InspectLet is a service that allows users to track the IP address of any person you are chatting with on WhatsApp or Facebook.
Facebook Messenger has used VoIP (Voice Over Internet Protocol) since April 2014, which essentially allows users to communicate for free.
STUN stands for Session Traversal Utilities for NAT and includes a set of protocols used in networking to better handle communication when going through network address translation (NAT). In simple terms, STUN provides a way for devices to securely communicate with other devices when they're located behind a router.
What is Cisco STUN?
Simple Traversal of UDP through NATs (STUN), is a network protocol allowing a client behind a NAT (Network Address Translator) to find out its public address, the type of NAT it is behind and the internet-side port associated by the NAT with a particular local port.
The Google STUN server is something you can freely use for development purposes, but, as a free service, there is no SLA. If you are deploying a commercial application, you should plan to deploy your own STUN/TURN servers.
Simple Traversal Underneath NATs (STUN) is a lightweight protocol that serves as a tool for application protocols in dealing with NAT traversal.