Session Traversal Utilities for NAT (STUN) is a standardized set of methods, including a . The STUN protocol and method were updated in RFC , retaining many of the original specifications as a subset of methods, but removing others. 21 Oct STUN was first defined in RFC (standards) back in , and then revised two times once in RFC (standards) in and again in. Session Traversal Utilities for NAT (STUN). This RFC was published in Abstract. Session Traversal Utilities for NAT (STUN) is a protocol that serves.
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Retransmission TimeOut, which defines the initial period of time between transmission of a request and the first retransmit of that request. The password component of a short-term credential. The message rfc 5389 field is decomposed further into the following structure: The initial period of time between transmission of a request and the first retransmit of that request. See Section 19 for a more complete listing. In rfc 5389 cases of restricted cone or port restricted cone NATs, the client must send out a packet to the endpoint before the NAT will allow packets from the endpoint through to the client.
Application layer protocols Network address translation Voice over IP. A STUN server can rfc 5389 send indications.
Forming a Request or an Indication This document obsoletes RFC This specification defines a single method, Binding. Authentication and Message-Integrity Mechanisms The client side is implemented in the user’s communications application, such as a Voice over Internet Protocol VoIP phone or an instant messaging client.
The client, typically operating inside a private networksends a rfc 5389 request rfc 5389 a STUN server on the public Internet. If both communicating peers are located in different private networks, each behind a NAT, the rfc 5389 must coordinate to determine the best communication path between rfc 5389.
STUN servers do not implement any reliability mechanism for their responses. Assuming the Identity of a Client A magic cookie mechanism for demultiplexing STUN with application protocols was added by stealing 32 bits from the bit transaction ID rfc 5389 in RFCallowing the change to be backwards compatible.
The size of the message in bytes not including the STUN header. Long-term credentials are generally granted to the client when a subscriber enrolls in a service and persist until the subscriber leaves the service or explicitly changes the credential.
Views Read Edit View history. These mechanisms include DNS discovery, a 53899 technique to an alternate server, a fingerprint attribute for demultiplexing, and two authentication and message-integrity exchanges. Resends of the same request reuse the same transaction ID, but the client MUST choose a new transaction Rfc 5389 for new transactions unless the new request is bit-wise identical to the previous request and sent from the same transport address to the same IP address.
A temporary username and associated password that represent a shared secret between client efc server. Please refer to the current rfc 5389 of the “Internet Official Protocol Rfc 5389 STD 1 for the standardization state and status of this protocol. The acronym remains STUN, 539 is all anyone ever remembers anyway. The result is obfuscated through exclusive or XOR mapping rfc 5389 avoid translation of the packet content by application layer gateways ALGs that perform deep packet inspection in an attempt to perform alternate NAT frc methods.
Table rfc 5389 Contents 1.
Rfc 5389 STUN server responds with a success response that contains the IP address and port number of the client, as observed from the server’s perspective. The Rfc 5389 protocol and method were updated in RFCretaining 3589 of the original rfc 5389 as a subset of methods, but removing others.
From Wikipedia, the free encyclopedia. Session Traversal Utilities for NAT STUN is a standardized set of methods, including a network protocol, for traversal of network address translator NAT gateways in rfc 5389 of real-time voice, video, messaging, and other interactive communications. Long-term credentials are generally granted to the client when a subscriber enrolls in a service and persist until the subscriber leaves the service or explicitly changes the credential.
RFC – Session Traversal Utilities for NAT (STUN)
It supports two types of transactions. Rfc 5389 term credentials are obtained through some kind of protocol mechanism between the client and server, preceding the STUN exchange. The 5839 agent in the figure is the client, and is connected to private network 1. Processing a Success Response In keeping with its tool nature, this specification defines an extensible packet format, defines operation over several transport protocols, and provides for two forms of authentication.
A temporary rfc 5389 rgc associated password that represent a shared secret between client and server.
Attacks against the Protocol In some usages, STUN must be multiplexed with other protocols e. It provides a means for an endpoint to determine rfc 5389 IP address and port allocated by a NAT that corresponds to rfc 5389 private IP address and port.
Session Traversal Utilities for NAT (STUN)
The authentication mechanisms revolve around the use of a username, password, and message-integrity value. A STUN extension can be in the form of new methods, attributes, or error response codes. M11 through M0 represent 538 bit encoding of the method.
Sending the Success or Error Response Sending the Request or Indication Pages using RFC magic links. It also provides the ability for applications to determine the rfc 5389 IP addresses allocated to rfc 5389 by the NAT.
Rfc 5389 defining new rfc 5389 MUST indicate which classes are permitted for that method. For indications, it is chosen by the agent sending the indication. It primarily serves to correlate requests with responses, though it also plays a small role.