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Paper Abstract and Keywords
Presentation 2010-10-15 14:55
Analysis of impact of traffic on large-scale NAT
Ryoichi Kawahara, Takeshi Yada, Tatsuya Mori (NTT) IN2010-78
Abstract (in Japanese) (See Japanese page) 
(in English) We investigate the impact of TCP traffic on a large-scale NAT (LSN), which has been attracting attention as a
means of leveraging a limited number of global IPv4 addresses. Through traffic measurement data analysis, we found the
followings: More than 1% of hosts generated more than 100 flows at the same time. The number of active flows depended
on the measurement points. At one measurement point, there was on average 1:43¡1:83 active flows per host, while at the
other point, there was on average 3:10¡3:98 active flows. When the inactive timer used to clear the flow state from a flow
table is changed from 15 s to 10 min, the number of active flows becomes more than 10 times larger. We also investigate
how to reduce the above impact on an LSN in terms of saving memory space and accommodating more users for each global
IPv4 address. To save memory space, we found that we can reduce the number of active flows on an LSN by a maximum
of 48% by regulating network anomalies. To accommodate more users for each global IPv4 address, when mapping a source
IP address from a private to a global IPv4 address, leveraging destination IP address information can effectively reduce the
required number of global IPv4 addresses by 86% on average.
Keyword (in Japanese) (See Japanese page) 
(in English) large scale NAT (LSN) / traffic measurement and analysis / number of flows / / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 224, IN2010-78, pp. 75-80, Oct. 2010.
Paper # IN2010-78 
Date of Issue 2010-10-07 (IN) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF IN2010-78

Conference Information
Committee IN  
Conference Date 2010-10-14 - 2010-10-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network middleware, Virtualization, Greening, Web service, Internet service, Ubiquitous service, Social network, Sensor network, etc. 
Paper Information
Registration To IN 
Conference Code 2010-10-IN 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Analysis of impact of traffic on large-scale NAT 
Sub Title (in English)  
Keyword(1) large scale NAT (LSN)  
Keyword(2) traffic measurement and analysis  
Keyword(3) number of flows  
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1st Author's Name Ryoichi Kawahara  
1st Author's Affiliation NTT (NTT)
2nd Author's Name Takeshi Yada  
2nd Author's Affiliation NTT (NTT)
3rd Author's Name Tatsuya Mori  
3rd Author's Affiliation NTT (NTT)
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Speaker Author-1 
Date Time 2010-10-15 14:55:00 
Presentation Time 25 minutes 
Registration for IN 
Paper # IN2010-78 
Volume (vol) vol.110 
Number (no) no.224 
Page pp.75-80 
#Pages 6 
Date of Issue 2010-10-07 (IN) 

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