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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An entity that implements the STUN protocol.

The password component of a short-term credential. Each usage specifies the mechanisms allowed with that usage. Receiving a Request or Indication Since all STUN attributes are padded to a multiple of 4 bytes, rfc 5389 last 2 bits of this field are rfc 5389 zero.

RFC – part 1 of 3

Network address translation is implemented via a number of different address and port mapping schemes, none of which is standardized. A STUN message that does not receive a response. A transport address learned by a client that identifies that client as seen by another host on an IP network, typically a STUN server. Rather, it is a tool to be used in the context of a NAT traversal solution.

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Extensibility was added rfc 5389 the protocol in a more structured way. Unless otherwise noted, numeric constants rfc 5389 in decimal base A transport address learned by a client that identifies that client rfc 5389 seen by another host on an IP network, typically a STUN server.

STUN is a lightweight protocol that allows rfc 5389 to discover the presence and types of NATs and firewalls between them and the public Internet. In the short-term credential mechanism, the client and the server exchange a rfc 5389 and password through some out-of-band method prior to the STUN exchange.

Session Traversal Utilities for NAT (STUN)

DNS Discovery of a Server Wing, The Internet Society October In rfc 5389 specification, the terms STUN client and client are synonymous. M11 through M0 represent a bit encoding of the method.

Pages using RFC magic links. In some usages, STUN must be multiplexed with other protocols e. Rfc 5389 a Success or Error Response Short-term credentials are obtained through some kind of protocol mechanism between the client and server, preceding the STUN exchange.

If both communicating peers are located in rfc 5389 private 5398, each behind a NAT, the peers must coordinate to determine the best communication path between them.


Same meaning as reflexive address. There is no challenge or nonce used.

Attributes are divided into two rgc Retransmission TimeOut, which defines the initial period of time between transmission of a request and the first retransmit of rfc 5389 request. The acronym remains STUN, which is all anyone ever remembers anyway. These are used to integrity rfc 5389 and authenticate the request and response. Processing a Success Response This is called a reflexive transport address.

RFC – Session Traversal Utilities for NAT (STUN)

Assuming the Identity of a Client The class indicates whether this is a request, a success response, an error response, or an indication. A magic cookie mechanism for demultiplexing STUN rfc 5389 application protocols was added by stealing 32 bits from the bit transaction ID defined in RFC rfc 5389, allowing the change to be backwards compatible.

Though this problem remains rfc 5389 this specification, those attacks are now mitigated through the use of more complete solutions that make use of STUN.

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