A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Internet Architecture Board Working Group of the IETF.
Title : Considerations for Selection of Techniques for NAT Traversal
Author(s) : J. Rosenberg
Filename : draft-iab-nat-traversal-considerations-00.txt
Pages : 21
Date : 2005-2-14
There are many protocols designed and deployed on the Internet today
which do not naturally traverse Network Address Translators (NAT).
In order to allow these protocols to work in the presence of NAT,
additional logic needs to be added to the network. This logic
modifies the behavior of the protocol in some way. There are choices
where this logic can be placed in the network. It can reside in the
NATs themselves, transparently altering the protocol; when this
occurs, it is called an Application Layer Gateway (ALG). It can
reside in server components, hiding the changes from NATs and clients
alike, it can reside in the clients, or it can reside in a
combination thereof. The choice of the placement of this logic
typically has implications on many aspects of the protocol, including
security, deployability, manageability and availability. This
document provides a set of considerations that should be taken into
account by protocol and network designers when making this choice.
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