• Title, Summary, Keyword: VPN

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VPN (Virtual Private Network) SW's examination example analysis (VPN(Virtual Private Network) SW의 시험사례분석)

  • Kim, Kyung-Muk;Yang, Hae-Sool
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.8
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    • pp.3012-3020
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    • 2010
  • VPN can give safety in connection in Timbuc-too, by corporation's basis communication means today that transfer user support in Timbuc-too is required compulsorily, VPN is activated. This research wishes to investigate base technology of VPN software field and investigate VPN software market trend and standard and develop estimation model of VPN software. For this special quality of VPN software investigation / analyze and investigate or analyze market trend and standard this to VPN software to base deduction of estimation item and estimation model develop.

The Performance Analysis on Remote Access VPN (원격접속 VPN에 대한 성능분석)

  • Kim, Ji-Hong
    • The Journal of Information Technology
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    • v.7 no.4
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    • pp.21-30
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    • 2004
  • A VPN(Virtual Private Network) is constructed using public wires to connect nodes. It can be used like the dedicated line and maintain the security of the data on the VPN. And It uses encryption and other security mechanisms to ensure that only authorized users can access the network. In this paper we summarize IPsec and VPN technology and construct pilot VPN system for analyzing the performance of remote access VPN. Then we analyze the performance of remote VPN system using VPN concentrator in case of single user and in case of multi users.

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A study on the comparison of VPN with Dedicated Line Network on security (보안측면에서의 가상사설망과 전용회선망의 비교 연구)

  • Jeong, Eun-Hee;Lee, Byung-Kwan
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.1 no.2
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    • pp.107-122
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    • 2008
  • Communication is be classified into public network and private network. VPN is made by integrating the circuit cost reduction of public network and the reliable security support of public network. This paper analyzes the IPSec using three layer tunneling, MPLS(Multi Protocol Label Switching) integrating 2 layer switching and 3 layer routing techniques and dedicated line from the viewpoint of security. In conclusion, VPN is better than dedicated network line in cost and security. If IPSec VPN is compared with MPLS VPN, MPLS VPN is more excellent than IPSec VPN in safe data transmission, cost, QoS and management.

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An MPLS VPN with Mobility Support (이동성을 지원하는 MPLS 방식 가상사설망)

  • Lee, Young-Seok;Choi, Hoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.12C
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    • pp.225-232
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    • 2001
  • In this paper, we describe a mechanism that supports the mobility service for VPN(Virtual Private Network) users on MPLS(Multiprotocol Label Switching) network. The MPLS VPN considered in this study is controlled by CE(Customer Edge) routers. In such a VPN, CE routers have additional functions to support mobile VPN users, i.e., Home Agent function, foreign Agent function, Correspondent Agent function. This mechanism is applied when a VPN node moves to other site of the saute VPN, or when it moves to other site of a different VPN, or to a non-VPN site. We perform a simulation study to compare the performance of CE based MPLS VPN with that of PE(Provider Edge) based MPLS VPN with mobility support.

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Approach with direct tunnels between CPE VPN GWs in star VPN topology (Star VPN 구조에서 CPE VPN GW간 직접 터널을 이용한 성능 향상 방안)

  • Byun, Hae-Sun;Lee, Mee-Jeong;Ahn, Sang-Joon
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1271-1274
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    • 2004
  • 현재 운용중인 대부분의 VPN은 모든 CPE(Customer Premise Equipment) VPN GW(Gateway)들이 Center VPN GW에 연결되어 있는 Star 구조를 취하고 있다. 이러한 구조에서는 모든 트래픽들이 항상 Center VPN GW를 거쳐서 전송되므로 비효율적인 트래픽 전송이 이루어진다. 또한 대용량의 멀티미디어 트래픽 전송이 빈번하거나 다수의 지점을 갖고 있는 기업의 경우 Center VPN GW에서의 오버헤드가 증가하게 된다. 이러한 문제를 해결하기 위한 방법으로는 IPSec의 IKE(Internet Key Exchange) 메커니즘을 이용하여 CPE VPN GW간 직접 터널을 맺어 줄 수 있으나, 터널 설립에 앞서 원격지 CPE VPN GW의 주소, 요구되는 보안 등급 등의 터널 설정에 필요한 정보를 관리자가 직접 설정해 주어야 한다. 이는 현재 DHCP와 같은 동적 IP 환경에서 운용되는 ADSL 기반의 VPN 환경에서 관리 오버헤드를 증가시키는 요인이 된다. 이에 본 논문에서는 CPE VPN GW 간 직접 터널 연결이 필요할 시에 자동적으로 제반 기능들이 수행될 수 있게 하는 주문형 터널 생성(On-demand Tunnel Creation) 메커니즘 제안한다. 시뮬레이션을 통해 제안하는 방안에 대하여 성능을 조사하였고, 이와 함께 기존의 Star VPN 구조, Full-mesh VPN 구조와 성능을 비교하였다. 시뮬레이션 결과, 제안하는 방안이 기존의 Star VPN 구조보다 확장성과 트래픽 전송효율성, Center VPN GW의 오버헤드 측면에서 우수한 성능을 보였으며 Full-mesh 구조의 VPN과 거의 비슷한 종단간 지연시간과 처리율을 보였다.

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Provider Provisioned based Mobile VPN using Dynamic VPN Site Configuration (동적 VPN 사이트 구성을 이용한 Provider Provisioned 기반 모바일 VPN)

  • Byun, Hae-Sun;Lee, Mee-Jeong
    • Journal of KIISE:Information Networking
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    • v.34 no.1
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    • pp.1-15
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    • 2007
  • Increase in the wireless mobile network users brings the issue of mobility management into the Virtual Private Network (VPN) services. We propose a provider edge (PE)-based provider provisioned mobile VPN mechanism, which enables efficient communication between a mobile VPN user and one or more correspondents located in different VPN sites. The proposed mechanism not only reduces the IPSec tunnel overhead at the mobile user node to the minimum, but also enables the traffic to be delivered through optimized paths among the (mobile) VPN users without incurring significant extra IPSec tunnel overhead regardless of the user's locations. The proposed architecture and protocols are based on the BGP/MPLS VPN technology that is defined in RFC24547. A service provider platform entity named PPVPN Network Server (PNS) is defined in order to extend the BGP/MPLS VPN service to the mobile users. Compared to the user- and CE-based mobile VPN mechanisms, the proposed mechanism requires less overhead with respect to the IPSec tunnel management. The simulation results also show that it outperforms the existing mobile VPN mechanisms with respect to the handoff latency and/or the end-to-end packet delay.

On-Demand Tunnel Creation Mechanism in Star VPN Topology (성형 VPN 구조에서의 주문형 터널 생성 메커니즘)

  • Byun, Hae-Sun;Lee, Mee-Jeong
    • Journal of KIISE:Information Networking
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    • v.32 no.4
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    • pp.452-461
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    • 2005
  • In the star VPN (Virtual Private Network) topology, the traffic between the communicating two CPE(Customer Premise Equipment) VPN GW(Gateway)s nay be inefficiently transferred. Also, the Center VPN GW nav erperience the overload due to excessive packet processing overhead. As a solution to this problem, a direct tunnel can be established between the communicating two CPE VPN GWs using the IKE (Internet Key Exchange) mechanism of IPSec(IP Security). In this case, however, the tunnel establishment and management nay be complicated. In this paper, we propose a mechanism called' SVOT (Star VPN On-demand Tunnel)', which automatically establishes a direct tunnel between the communicating CPE VPN GWs based on demand. In the SVOT scheme, CPE VPN GWs determine whether it will establish a direct tunnel or not depending on the traffic information monitored. CPE VPN GW requests the information that is necessary to establishes a direct tunnel to the Center VPN GW Through a simulation, we investigate the performance of the scheme performs better than the SYST scheme with respect to scalability, traffic efficiency and overhead of Center VPN GW, while it shows similar performance to the FVST with respect to end-to-end delay and throughput.

QoS Support Mechanisms in Mobile MPLS VPN (이동 MPLS VPN에서의 QoS 지원 방안)

  • Lee Young-seok;Yang Hae-kwon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.1
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    • pp.65-73
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    • 2006
  • Network based VPN(Virtual Private Network) using MPLS(Multiprotocol Label Switching) technology, called PE(Provider Edge router) based MPLS VPN, is regarded as a good solution for intranets or ext3nets because of the low cost and the flexibility of the service provision. In this paper, we describe a mechanism that allows the VPN users to move from one site to another site of the VPN network based on the BGP-E MPLS technology. This mechanism is designed for PE(Provider Edge) routers of the backbone network. PE routers connected to the VPN sites establish a new MPLS path to the mobile node after they detect movement of the mobile VPN node. The new location may belong to the same VPN or to different VPN. We desisted VPN management and control functions of the PE routers in order to interface with the Mobile IP protocol and support the QoS mechanism. The pilot implementation and performance measurement were carried out on a simulation using COVERS tool.

A Resource Reservation Protocol and Packet Scheduling for Qos Provisioning in Hose-based VPNs (Hose 기반 VPN에서의 서비스품질 제공을 위한 자원예약 프로토콜과 패킷 스케줄링 기법)

  • Byun Hae-Sun;Woo Hyun-Je;Kim Kyoung-Min;Lee Mee-Jeong
    • Journal of KIISE:Information Networking
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    • v.33 no.3
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    • pp.247-256
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    • 2006
  • Among the resource provisioning mechanisms for the hose based Virtual Private Network (VPN) Quality of Service (QoS ), VPN-specific state provisioning allows the service provider to obtain highest resource multiplexing gains. However, dynamic and automatic resource reservation for the VPN-specific state provisioning is difficult due to the lack of appropriate resource reservation protocol. Furthermore, users of a VPN may experience unfair usage of resources among themselves since the reserved resources of a VPN are shared by the VPN users in a similar way that the traditional LAN bandwidth is shared by the attached hosts. In this paper, we propose a resource reservation protocol and a traffic service mechanism, which not only enable dynamic and automatic resource reservation according to the VPN-specific state provisioning algorithm, but also enforce the fair usage of reserved resources among the users of a VPN in case of congestion.

A Study on the Performance of VPN based on MPLS Networks (MPLS 망을 기반으로 하는 VPN의 성능에 관한 연구)

  • Shin, Tae-Sam;Kim, Young-Beom
    • Journal of the Institute of Convergence Signal Processing
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    • v.8 no.1
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    • pp.51-57
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    • 2007
  • In this paper we introduce the concept of MPLS-based VPN and propose a scheme for providing VPN services in MPLS networks. Furthermore, we design the control components and the operational procedures and evaluated the performance of traditional VPN implementation methods and MPLS-based VPN. In this scheme it is possible to solve several problems that IP-based VPN pertains via the allocation of VPN ID and virtual space without tunneling, thereby providing effective VPN services. In other words, the MPLS-based VPN scheme uses MPLS networking technology together with the PSTN which can achieve a perfect segregation of user traffic on per-customer basis in a physical link and can guarantee high reliability and security levels. Specially, in the perspective of customers, it can save networking facilities installation and maintenance costs considerably. On the contrary, it possesses some shortcomings in that its deployment tends to be restricted within an ISP's network boundary and it is vulnerable to external security break-ins when going through public networks such as the Internet due to its lack of data encryption capability.

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