A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Discovering, Querying, and Controlling Firewalls and NATs using STUN
Author(s) : D. Wing, et al.
Filename : draft-wing-behave-nat-control-stun-usage-04.txt
Pages : 27
Date : 2007-10-10
Simple Traversal Underneath NAT (STUN) is a mechanism for traversing
NATs. STUN requests are transmitted through a NAT to external STUN
servers. While this works very well, its two primary drawbacks are
the inability to modify the properties of a NAT binding and the need
to query a public STUN server for every new NAT binding (e.g., every
phone call). These drawbacks require frequent keepalive messages,
which contribute negatively to server and network load.
This document describes two mechanisms to discover NATs and firewalls
and a mechanism to query and control them. With these mechanisms,
binding discovery and keepalive traffic can be reduced to involve
only the necessary NATs or firewalls. This eliminates the keepalive
traffic to servers, and vastly reduces keepalive traffic across the
network. At the same time, backwards compatibility with NATs and
firewalls that do not support this specification is retained, which
allows for incremental deployment of these mechanisms.
This document is discussed on the SAFE mailing list,
<http://www1.ietf.org/mailman/listinfo/safe>.
Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
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