• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.8B
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• pp.747-754
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• 2004

The Internet is in the phase of transition of IPv6 and the network equipments based on IPv6 are released. A lot of investments are done in development of network equipments but important thing is service technology. And a various experiments are performed for this service technology. However, the performance measurements of a router between IPv4 and nv6 networks are mainly focused. Therefore, the performance measurement of Internet application services need to be done. In this paper, we show the performance analysis results that the Internet application services are provided regardless of network infra and protocols. As a result, we know that the efficiency of dual networks is lower than the native network for the Internet application services.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.17 no.6
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• pp.77-87
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• 2007

It will need a quite long time to replace IPv4 protocol, which currently used, with IPv6 protocol completely, thus we will use both IPv4 and IPv6 together in the Internet during the period. For coexisting protocols, IETF standardized various IPv4/IPv6 transition mechanisms. However, new security problems of IPsec adaptation and IPv6 packet filtering can be raised by tunneling mechanism which mainly used in transition mechanisms. To resolve these problems, we suggested two improved schemes for packet filtering functions, which consists of an inner header filtering scheme and a dedicated filtering scheme for IPv4/IPv6 transition mechanisms. Also we implemented our proposed schemes based on Linux Netfilter framework, and we tested their filtering functions and evaluated experimental performance of our implementation on IPv4/IPv6 transition testbed. These evaluation tests indicated that our improved packet filtering functions can solve packet filtering problems of IPv4/IPv6 transition mechanisms without severely affecting system performance.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.7 no.1
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• pp.75-83
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• 2008

In this paper, we propose an efficient algorithm that assigns single temporary IPv4 address and port number to improve efficiency of IPv4 address that is allocated in DSTM service. And, we have analyzed the elementary functions for DSTM and have designed the functional modules. Also, we have implemented the DTI interface for encapsulation and decapsulation of IPv6 packets. The performance analysis and comparison are investigated whether the appropriate interworking service is possible or not. Our observation results show that the performance of IPv4 over IPv6 tunneling is suitable to DSTM service due to the reduction of delay by eliminating checksum calculations in the header of IPv6 tunneling.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.7
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• pp.1230-1251
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• 2011

This document specifies a new IPv6 deployment protocol called CHANC, which stands for Configuring Hosts to Auto-detect (IPv6, IPv6-in-IPv4, or IPv4) Network Connectivity. The main part is an application level tunneling protocol that allows Internet Service Providers (ISPs) to rapidly start deploying IPv6 service to their subscribers whom connected to the Internet via IPv4-only access networks. It carries IPv6 packets over HTTP protocol to be transmitted across IPv4-only network infrastructure. The key aspects of this protocol are: offers IPv6 connectivity via IPv4-only access networks, stateless operation, economical solution, assures most firewall traversal, and requires simple installation and automatic configuration at customers' hosts. All data packets and routing information of the IPv6 protocol will be carried over the IPv4 network infrastructure. A simple application and a pseudo network driver must be installed at the end-user's hosts to make them able to work with this protocol. Such hosts will be able to auto-detect the ISP available connectivity in the following precedence: native IPv6, IPv6-in-IPv4, or no IPv6 connectivity. Because the protocol does not require changing or upgrading customer edges, a minimal cost in the deployment to IPv6 service should be expected. The simulation analysis showed that the performance of CHANC is pretty near to those of native IPv6, 6rd, and IPv4 protocols. Also, the performance of CHANC is much better than that of D6across4 protocol.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.2
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• pp.289-294
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• 2004

The IPv6(Internet Protocol version 6), a next generation Internet protocol. was standardized to solve the problems of the IPv4(Internet Protocol version 4). However, the IPv4 could not be actually converted to the IPv6 at one time. Therefore, the transition mechanism is thought to be very much important to be compatible with the IPv4 naturally and convert to the IPv6 network gradually. Despite of the development of various kinds of the transition mechanism, the IPv6 network was not expanded. The research was mainly made not for current system environment but for technical purposes. This paper investigated the performances through the transition mechanism and examined proper ways being applicable to current environment.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.5
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• pp.578-587
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• 2003

The DSTM (Dual Stack Transition Mechanism), one of tunneling mechanism, is considered as the best solution in IPv4/IPv6 transition recently. The DSTM provides a method to assure IPv4/v6 connectivity based on 4over6 (IPv4-over-IPv6) tunneling and temporal allocation of a global IPv4 address to a host requiring such communication. A TEP (Tunnel End Point) operates as a border router between IPv6 domain and IPv4 Internet, which performs encapsulation and decapsulation of 4over6 tunneling packets to assure hi-directional forwarding between both networks. In this paper, we analyze basic standards of the IPv6 protocol. And, we design and implement a DSTM TEP daemon block. The TEP daemon analyzes a fevers tunneling packet that is forwarded by the DSTM node, establishes the TEP's 4over6 interface, and supplies communication between a DSTM and a IPv4-only node. Finally, we construct a DSTM testbed and measure performance of the DSTM TEP. Our observation results show that performance of TEP supports the DSTM service.

• Journal of Digital Contents Society
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• v.19 no.3
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• pp.505-512
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• 2018

Internet demand has increased rapidly, and Internet Protocol Version 4, the main Internet protocol, can not cope with various types of network demand in the future. Therefore, it is urgent to spread IPv6-based stable network to solve the shortage of Internet address resources. Due to the proliferation of IoT and the increase in mobile devices, efficient and optimal IPv6 routing design is indispensable. In this paper, we have studied about characteristics of IPv6, address system of IPv6, structure analysis and efficient routing technology among IPv6 terminals. Furthermore, experimental results on routing packet analysis and convergence time are presented in network - based IPv6 routing implementation environment. In addition, we show the results of the experiment analysis by dividing the implementation of IPv6 routing, operation test, and fail over performance into three kinds of routing protocol methods. As a result, this study can be applied to the introduction of IPv6 system, test bed environment construction, and network design.

• Journal of KIISE:Information Networking
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• v.32 no.3
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• pp.391-403
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• 2005

Several nv6 mobility support protocols for mobile Internet services are proposed in IETP : Mobile Ipv6, Hierarchical Mobile Ipv6, and Fast Handovers over Mobile Ipv6. Recently, IEEE 802.11 network has also been widely deployed in public areas for mobile Internet services. In the near future, IPv6 mobility support over IEEE 802.11 network is expected to be a key function to actualize the All If-based mobile various services. For appropriate application of these protocols, the IPv6 mobility support protocols should be analyzed according to their characteristics in terms of signaling, handover latency, lost packets, and required buffer sire as well as the impact of lower layer such as IEEE 802.11 network. In this paper, we analyze the performance of the protocols over IEEE 802.11 network. We define a packet-level traffic model, a network system model, and a mobility model. From these models, we construct a framework for the performance analysis. We also make cost functions to formalize each protocol's performance. Lastly, we analyze the effect of varying parameters used to show diverse numerical results, and compare with each other. From the analysis results, it is concluded that each Protocol has contrary or contrastive advantages with other Protocols, so there is no protocol that holds a dominant position.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.963-966
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• 2003

IPv6-IPv4 변환시스템은 기존의 IPv4 네트워크와 신규 구축되는 IPv6 네트워크 간의 통신을 가능하게 하는 게이트웨이 기반 기술이다. 이러한 IPv6-IPv4 변환시스템에서는 네트워크 간의 모든 트래픽을 변환해야 하므로 높은 성능을 요구된다. 이에 본 연구에서는 이전 연구에서 구현된 게이트웨이 기반 IPv6-IPv4 변환시스템과 변환기의 성능분석에 적용될 수 있는 큐잉 모델을 제시하고 부과되는 트래픽에 따른 처리 성능을 산출하는 분석적인 방법을 제시하였다. IPv6-IPv4 변환시스템의 분석 모델의 경우, 도착간격은 지수분포를 따르고, 서비스시간은 M/M/l/K 모델 기반의 일반분포를 따른다. 또한 IPv6-IPv4 변환시스템의 변환기는 트래픽에 대한 변환 처리를 담당하는 핵심 모듈로서, 순차적인 단계로 이루어진다. 즉, 변환시스템의 변환기 자체의 분석 모델의 도착간격은 지수분포를 따르고, 서비스시간은 M/G/l/K 모델 기반의 일반분포를 따른다. 이렇게 제안된 모델에 대해 상세하게 설명하였으며, 이를 검증하기 위해서 모델을 적용하여 근사한 결과와 실제 측정 결과를 비교하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1427-1430
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• 2002

현재 사용되고 있는 IPv4(Internet Protocol Version 4)의 주소의 고갈 문제가 대두 되면서 IPv6(Internet Protocol Version 6)[1]가 거론되기 시작하였다. IPv4 네트워크에 IPv6 적용시 IPv4 네트워크와의 상호 동작을 필요로 하고 있기 때문에 이를 위해서 IPv6 호스트와 라우터에서 IPv4를 지원하기 위한 메커니즘들이 연구되고 있다. 하지만 IPv6의 도입의 초기 단계에서 가장 우선적으로 요구되는 사항은 전체적으로 구축되어 있는 IPv4 네트워크와 소규모 IPv6 네트워크와 통신하기 위한 방법을 제공하는 것이다. 이를 위해서 현재까지 제안된 IPv6 전이 메커니즘들에 대한 성능 분석을 통하여 가장 합리적이 모델을 제시함으로써 IPv6 전이에 있어서의 모델을 제시하고자 한다.