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Author:Yang, Lu
Title:Network Address Translator Traversal in Java
Publication type:Master's thesis
Publication year:2009
Pages:[10] + 85      Language:   eng
Department/School:Informaatio- ja luonnontieteiden tiedekunta
Main subject:Tietokoneverkot   (T-110)
Supervisor:Aura, Tuomas
Instructor:Knutsson, Björn
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  6758   | Archive
Keywords:NAT
NAT Traversal
CSNT
TCP NAT Traversal
Abstract (eng): The invention of Network Address Translator provides a valuable relief on the IP address exhaustion problem.
Due to the lack of a standard, it causes many difficulties for new Peer-to-Peer, VoIP and asynchronous notification communications.
Although many traversal solutions have been proposed, most of them deal with UDP applications and TCP traversal schemes have received relatively little attention.
Among the techniques dedicated to TCP, most modify the underlying TCP protocol and operate on the level of raw IP sockets, which brings in many difficulties for network applications to integrate those traversal techniques because the applications are often implemented by normal socket APIs, which operates on a higher abstraction level.
In addition, little research has been done on traversal techniques for TCP client/server applications possibly because of the assumption that a server should be always placed in a public network.

The thesis investigates the possibility of designing a NAT traversal scheme for TCP that can he implemented in a high-level programming language using normal socket APIs without support for raw sockets.
We design and implement such a scheme for TCP client/server applications in the Java language.
The thesis also provides a comprehensive overview of the major aspects of NAT including its history, its characteristics and existing traversal technologies.
It is hoped that the unified and illustrated presentation of the various aspects of NAT traversal can be used as a tutorial for beginners in this field.
ED:2010-06-01
INSSI record number: 39693
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