A New Internet-Draft is available from the on-line Internet-Drafts
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Title : Discovering, Querying, and Controlling Firewalls and NATs using STUN
Author(s) : D. Wing, J. Rosenberg
Filename : draft-wing-behave-nat-control-stun-usage-02.txt
Pages : 27
Date : 2007-6-1
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 messages which present
a load on servers (like SIP servers and STUN servers) and are bad for
low speed access networks, such as cellular access.
This document describes several mechanisms to discover NATs and
firewalls and a method to query and control them. With these
changes, binding discovery and keepalive traffic can be reduced to
involve only the necessary NATs or firewalls. At the same time,
backwards compatibility with NATs and firewalls that do not support
this document is retrained.
This document is discussed on the BEHAVE mailing list,
<https://www1.ietf.org/mailman/listinfo/behave>, in anticipation of a
BoF at IETF69 in Chicago.
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