The SIP device registers its location with the registrar as sip: :5060. The SIP device has a non-routable Private IP address 192.168.0.10. A SIP device with user Bob sits behind a NAT and wants to register its location with a SIP registrar located on the public Internet. Contact us to discuss your network application requirements.Ĭonsider this example using the SIP protocol. Classic STUN works by discovering the presence of a NAT, the type of NAT, and the IP address/port mappings assigned by the NAT. What is STUN?Ĭlassic STUN Protocol is a client-server protocol that was created to solve some of the issues traversing a Network Address Translator (NAT) for VoIP implementations. RFC 3489 STUN - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs) - the first version of STUN.VOCAL’s software library supports Classic STUN (Simple Traversal of UDP Through NAT). There is no preference setting for the STUN dissector. The well known UDP/TCP port for STUN traffic is 3478. UDP/ TCP/ TLS: Typically, STUN uses UDP, TCP or TLS as its transport protocol.The current draft of STUN (draft-ietf-behave-rfc3489bis-05) is in WGLC in the Behave WG of the IETF, and the relay usage (formerly known as TURN) will be soon in WGLC. There was some deployments in the field of implementations based on this draft (draft-ietf-rfc3489bis-02 and draft-rosenberg-midcom-turn-08) After this, the development of STUN was essentially rebooted, and TURN became a STUN usage. Also TURN was designed as a STUN extension to create a packet relay.

After the publication of RFC 3489, the work restarted to fix the problems, and the NAT behavior discovery usage was removed.

It was a simple client/server protocol with two usages: Finding the binding IP address and port in a NAT, and discovering the NAT behavior. STUN was originally an acronym for Simple Traversal of UDP Through NAT. Simple Traversal Underneath NATs (STUN) is a lightweight protocol that serves as a tool for application protocols in dealing with NAT traversal.

How to use wireshark classic stun