• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.5
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• pp.1097-1103
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• 2015

In order to build network infrastructure to implement the aforementioned advantages enabling smart device users to work anywhere, professional support and expensive VPN devices are required. This is a barrier to supplying VPN devices to small and medium-sized institutes. To address this issue, this study aims to implement OpenVPN, OpenSSH and iproute based on the OpenWRT platform which is an embedded OS for open networks in affordable open wired/wireless gateway H/W platforms to support the inter-network VPN. In addition, the network environment can be maintained optimal by applying a "multi-queuing real-time traffic shaping technology" to VPN tunnels, although channel quality changes.

• 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.

• Journal of information and communication convergence engineering
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• v.6 no.1
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• pp.64-67
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• 2008

VoIP is vulnerable to attack since it uses the Internet to which many people connect simultaneously. In this paper, we designed and implemented a Wireless VoIP + VPN system with which secure telephone calls are possible using the open project SIP VoIP Gateway, 'Asterisk' and 'OpenVPN'.

• Journal of the Korea Society of Computer and Information
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• v.8 no.1
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• pp.60-68
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• 2003

Now the development of using a internet and security equipment is Processed actively. But It is presented problems about compatability and availability between variable equipment as several protocol. It is able to occur the Problem which is not considered efficiency as monopoly security equipment for the standardization of some vendor As a using of VPN gateway equipment. the same equipments have been actually used only for sale a communication equipment which are not confirmed(authenticate) between of mutual equipments. These problem is remain which are not considered suitable network environment and Position by mutual authentication Processing. Because it is considered for only sale a equipment of several vendor. And You will be remain where is unable to protect from attack of using the same equipment, and You will need a actually Protected method. By authentication system of base on Pn , although there is an intended attack from the third intruder, users can be protected with safe from the physical attacks since he is not a Permitted user by employing CA-VPN gateway that is more viable than the previous VPN connection in its security and certification.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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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.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.1081-1084
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• 2006

MVPN(Mobile Virtual Private Network)은 이동단말을 사용하는 이동근무자가 지역적 제한 없이 VPN 서비스를 제공받을 수 있도록 하는 기술이다. 현재 IPsec-based VPN의 비중을 고려해볼 때, MVPN 기술은 Mobile 사용자에게 이동성을 제공하기 위한 Mobile IP프로토콜과 IPsec 기반 VPN 기술의 공존이 주된 연구 내용이다. mobile IP가 IPsec-based VPN GW(Gateway)와 동작할 경우 비호환성 문제가 발생한다. IETF에서는 두 프로토콜 간의 비호환성을 해결하기 위해VPN GW의 외부에 홈 에이전트(x-HA)를 새롭게 추가하는 방안이 연구되고 있다. 이에, AAA(Authentication, Authorization, Accounting) 서버를 이용하여 신뢰성 있는 x-HA를 동적으로 할당하는 방안이 제시되었으나, 세션 키의 외부 노출과 네트워크 간 이동 시 최초 핸드오프 시간이 오래 걸리는 한계를 지닌다. 본 논문은 이와 같은 문제점을 해결하여 이동하는 원격 VPN 사용자에게 보다 안전하며 핸드오프 지연시간이 최소화된 통신을 제공하는 방안을 제안한다.

• Journal of the Korea Society of Computer and Information
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• v.10 no.5 s.37
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• pp.237-244
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• 2005

IP-Internet Telephony Service has not vet been achieved that of operating an IP-PBX service and a consumer Internet telephone services using VoIP technologies. In this paper, i suggest that the technologies of the VoIP Secure Gateway have connecting and securing for IP-Internet Telephony Service which makes If telephony protocols, firewall VPN tunneling, using Application Level Gateway, connection of the VoIP Secure Gateway. I suggest of telecommunication technologies that are enables an enterprise If-PBX service to interoperate with a consumer IP telephony service through a firewall. Also, I have proposed the solutions of security problems which was the security for VoIP Secure Gateway.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.589-590
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• 2016

Virtual Private Network (VPN) is commonly used in business situations to provide secure communication channels over public infrastructure such as Internet. This is important matters because these networks can be set-up with a lower cost of ownership compared to other means of securing communications. VPN is a proven technology that does provide security strong enough for business use. However, performance of these networks is also important in that lowering network and server resources can lower costs and improve user satisfaction. We analyzed network performance analysis of VPN protocols.

• Journal of KIISE:Information Networking
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• v.34 no.1
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• pp.62-72
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• 2007

Mobile Virtual Private Network (MVPN) provides VPN services without geographical restriction to mobile workers using mobile devices. Coexistence of Mobile IP (MIP) protocol for mobility and IPsec-based VPN technology are necessary in order to provide continuous VPN service to mobile users. However, Problems like registration failure or frequent IPsec tunnel re-negotiation occur when IPsec-based VPN Gateway (GW) and MIP are used together. In order to solve these problems, IETF proposes a mechanism which uses external home agent (x-HA) located external to the corporate VPN GW. In addition, based on the IETF proposal, a mechanism that assigns x-HA dynamically in the networks where MN is currently located was also proposed with the purpose to reduce handover latency as well as end-to-end delay. However, this mechanism has problems such as exposure of a session key for dynamic Mobility Security Association (MSA) or a long latency in case of the handover between different networks. In this paper, we propose a new MVPN protocol in order to minimize handover latency, enhance the security in key exchange, and to reduce data losses cause by handover. Through a course of simulation, the performance of proposed protocol is compared with the existing mechanism.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05b
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• pp.1389-1392
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• 2003

최근 초고속인터넷의 급속한 확장과 무선 핫스팟(Hotspot)의 등장은 인터넷을 컴퓨터 통신의 중심에 두게 되었다. 이는 다양한 컴퓨터 통신의 매체들이 인터넷으로 통합되는 것을 의미하며 이러한 통합은 통신망의 물리적, 논리적인 구조에 많은 영향을 미치게 되었다. 본 논문은 Mobile IPv6와 VPN이 상호 연동하는 시나리오에서 발생되는 문제들을 추적한다. 끊김 없는 이동성을 제공하기 위해 제시된 솔루션을 분석하여, VPN 게이트웨이와 연동하는 GHA(Gateway Home Agent)의 하드웨어적인 구현을 제안하며 IPSec Based VPN이 아닌 환경과 새로이 제안된 내용들을 추가하여 성능분석이 가능한 테스트 베드의 구축을 제안한다.