Can: A context-aware NAT traversal scheme

Chien-Chao Tseng, Chia Liang Lin*, Li-Hsing Yen, Jyun Yan Liu, Cheng Yuan Ho

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Network Address Translation (NAT) is a technique commonly used to share one public IPv4 address among several hosts located behind a NAT device. NAT devices typically block session requests originating from outside, causing NAT traversal problem that prevents the establishment of peer-to-peer (P2P) sessions. There have been many proposals for the NAT traversal problem. However, existing methods induce high connectivity check delay and resource demand when finding a communicating path, calling for a routine that determines the path best suited for a given pair of communicating peers. This study proposes CAN, a Context-Aware NAT traversal scheme which gathers and exchanges network-context information to find the most appropriate path for two communicating peers behind NAT devices. We have implemented CAN and conducted extensive experiments with off-the-shelf NAT devices to compare the performance of CAN with Interactivity Connectivity Establishment (ICE), the most acknowledged approach to creating a session across NATs. Experimental results show that CAN outperforms ICE in terms of direct communication ratio, connectivity check delay and message overload when checking connectivity.

Original languageEnglish
Pages (from-to)1164-1173
Number of pages10
JournalJournal of Network and Computer Applications
Volume36
Issue number4
DOIs
StatePublished - 1 Jul 2013

Keywords

  • CAN
  • ICE
  • NAT
  • NAT traversal
  • STUN
  • TURN

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