• Title/Summary/Keyword: NAT

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A Study on Relay Server Topology inside NAT for Pure P2P (순수 P2P를 위한 NAT 내부의 Relay Server 토폴로지에 관한 연구)

  • Shon, Hyung-Doh;Kang, Seung-Chan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.3
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    • pp.575-580
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    • 2008

  • Lately, the use of the NAT has become unavoidable with the increase of P2P traffic along with the exhaustion of IPv4 IP address. Due to NAT properties, NAT's internal host can only be connected through a relay method using the outside server. Accordingly, there is a lot of resource exhaustion of the relay server on the NAT exterior and network traffic increases. This essay proposes a topology that can form sessions to the NAT interior from the NAT exterior and that will decrease network traffic by placing NAT exterior relay servers in the NAT interior.

  • https://doi.org/10.6109/jkiice.2008.12.3.575 인용 PDF KSCI

IPsec Support for NAT-PT in IPv6 Transition Mechanisms (IPv6 전환 기술 중 NAT-PT에서의 IPsec 적용 방안)

  • Choi Inseok;Kim Younghan;Park Yongseok;Jung Souhwan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.11B
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    • pp.736-743
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    • 2005

  • NAT-PT is one of the IPv6 transition mechanisms, as defined in RFC2766, allowing IPv6-only devices to communicate with IPv4-only devices and vice versa. In NAT-PT, sender fail to verify TCP/UDP checksum and authentication data due to IP translation in the NAT-PT server The NAT-PT, therefore, has a limit to applying the IPsec that provides the end-to-end security such as confidentiality, authentication, and integrity. This paper proposes a scheme to apply the IPsec using IP HTI in NAT-PT environment.

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The Spot Scanning Irradiation with $^{11}C$ Beams

  • Urakabe, Eriko;Kanai, Tatsuaki;Kanazawa, Mitsutaka;Kitagawa, Atsushi;Suda, Mitsuru;Iseki, Yasushi;Tomitani, Takehiro;Shimbo, Munefumi;Torikoshi, Masami
    • Proceedings of the Korean Society of Medical Physics Conference
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    • 1999.11a
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    • pp.188-191
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    • 1999

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A Remote SNMP Connection Request Mechanism for NATed Devices using UDP Hole Punching and Heuristic Hole Binding Time Search (UDP 홀 펀칭과 경험적 홀 유지시간 탐색을 이용한 NAT 환경단말의 SNMP 원격 접속요청 메커니즘)

  • Park, Choon-Gul;Kim, Seong-Il;Jeong, Ki-Tae;Lee, Young-Seok
    • Journal of KIISE:Information Networking
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    • v.35 no.5
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    • pp.367-373
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    • 2008

  • Recently, the NAT middlebox widely deployed in the home network environment prohibits DM operations from reaching user devices behind NAT. In this article, we focus on NAT issues to manage home network devices. Particularly, we discuss standardization efforts, and present our proposal to deploy DM services for VoIP and IPTV devices under NAT. By slightly changing behaviors of Simple Network Management Protocol (SNMP) Manager and Agent, and defining additional Management Objects (MOs) to gather NAT binding information, we could solve the NAT traversal problem under symmetric NAT. Moreover, we propose an enhanced method to search the UDP hole binding time of the NAT box. We applied our method to randomly selected 22 VoIP devices out of 194 NATed hosts in the real broadband network and have achieved 99% of the success ratio for exchanging SNMP request messages and 26% of enhancement for searching the UDP hole binding time.

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