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Title : Discovering, Querying, and Controlling Firewalls and NATs using STUN
Author(s) : D. Wing, et al.
Filename : draft-wing-behave-nat-control-stun-usage-03.txt
Pages : 27
Date : 2007-7-10
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 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 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. At the same time, backwards
compatibility with NATs and firewalls that do not support this
document is retained, which allows for incremental deployment of
these mechanisms.
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