• Title, Summary, Keyword: Address translation

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Design and Implementation of IPv6-support FTP-ALG (IPv6 지원 FTP-ALG 설계 및 구현)

  • 홍용근;이주철;신명기;김형준
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.652-655
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    • 2002
  • The next generation Internet Protocol IPv6 that is appeared to solve the exhausting problem is now widely deployed in a testbed or commercial site. To successfully deploy IPv6, interoperation with exist IPv4 hosts and routers and interactions with many IPv4 applications are more important. The NAT-PT (Network Address Translation-Protocol Translation) among IPv6 transition mechanism enables the communication between IPv4 and IPv6 host with translating IPv4 address and IPv6 address. But for DNS and FTP, another specific mechanism is needed when internet address is included in packet payload area. This paper describes the design and implementation of IPv6-support FTP-ALG, (Application Layer Gateway) to enable FTP service between IPv4 node and IPv6 node.

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An Efficient Flash Translation Layer Considering Temporal and Spacial Localities for NAND Flash Memory Storage Systems

  • Kim, Yong-Seok
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.12
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    • pp.9-15
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    • 2017
  • This paper presents an efficient FTL for NAND flash based SSDs. Address translation information of page mapping based FTLs is stored on flash memory pages and address translation cache keeps frequently accessed entries. The proposed FTL of this paper reduces response time by considering both of temporal and spacial localities of page access patterns in translation cache management. The localities of several well-known traces are evaluated and determine the structure of the cache for high hit ratio. A simulation with several well-known traces shows that the presented FTL reduces response time in comparison to previous FTLs and can be used with relatively small size of caches.

A STUDY OF AN NAT USING THE TCP SEGMENT INFORMATION (TCP 세그멘트 정보를 이용한 NAT에 대한 연구)

  • JaeYongHwang;GiHoJoo
    • Journal of the Korean Geophysical Society
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    • v.4 no.4
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    • pp.239-249
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    • 2001
  • NAT (Network Address Translation) is an IP address modification protocol that translates private IP addresses into authentic Internet addresses. The main features of NAT are to improve network security and to save IP addresses. Generally speaking, in order to perform its functionality. NAT uses the address informaiton in the packet header. Certain application protocols, however, use the information in the packet data as well as the imformation in the packet header to perform end-to-end communication. Therefor, to support these types of application protocols, NAT should be able to perform appropriate translation of protocol information in the packet data. In this thesis, we design and implement a method which translates virtual IP information in the packet data into real IP information by using port proxy server.

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HAMM(Hybrid Address Mapping Method) for Increasing Logical Address Mapping Performance on Flash Translation Layer of SSD (SSD 플래시 변환 계층 상에서 논리 주소 매핑의 성능 향상을 위한 HAMM(Hybrid Address Mapping Method))

  • Lee, Ji-Won;Roh, Hong-Chan;Park, Sang-Hyun
    • The KIPS Transactions:PartD
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    • v.17D no.6
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    • pp.383-394
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    • 2010
  • Flash memory based SSDs are currently being considered as a promising candidate for replacing hard disks due to several superior features such as shorter access time, lower power consumption and better shock resistance. However, SSDs have different characteristics from hard disk such as difference of unit and time for read, write and erase operation and impossibility for over-writing. Because of these reasons, SSDs have disadvantages on hard disk based systems, so FTL(Flash Translation Layer) is designed to increase SSDs' efficiency. In this paper, we propose an advanced logical address mapping method for increasing SSDs' performance, which is named HAMM(Hybrid Address Mapping Method). HAMM addresses drawbacks of previous block-mapping method and super-block-mapping method and takes advantages of them. We experimented our method on our own SSDs simulator. In the experiments, we confirmed that HAMM uses storage area more efficiently than super-block-mapping method, given the same buffer size. In addition, HAMM used smaller memory than block-mapping method to construct mapping table, demonstrating almost same performance.

Performance Evaluation of RSIP Gateway in Intranet Environment (인트라넷 환경에서 RSIP 게이트웨이의 성능분석)

  • Kim, Won;Lee, Young-Taek;Jun, Moon-Seog
    • The KIPS Transactions:PartC
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    • v.11C no.5
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    • pp.683-688
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    • 2004
  • NAT is a very useful IP address translation technique that allows two connected networks using different and incompatible IP address schemes. But it is impractical to use NAT for an application which uses the encrypted IP packet, embedding IP addresses inside of data payloads, to guarantee End-to-End Security such as IPSec. In addition to rewriting the source/destination IP addresses in the packet, NAT must modify IP checksum every time, which could lead to considerable performance decrease of the overall system in the process of the address translation. RSIP is an alternative to solve these disadvantages of NAT and the address shortage problems. Both NAT and RSIP divide networks into inside and outside addressing realms. NAT translates addresses between internal network and external network, but RSIP uses a borrowed external address for outside communications. RSIP server assigns a routable public address to a RSIP client temporarily to communicate with public net-work outside of the private network. In this paper, RSIP gateway for intranet environment is designed and its performance is evaluated. From the results of performance evaluation, we knew that RSIP is operated less sensitive to the data traffic. Also, the experiment shows that RSIP performs better than NAT when the transmission data grows larger.

Wireless Internet Local Broadcasting System using IP Address Translation (IP 주소변환기능을 이용한 무선 인터넷 지역방송 시스템)

  • Oh, Jong-Taek
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.3B
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    • pp.217-223
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    • 2003
  • In spite of widely deploying information broadcasting services based on Internet, there are some limitations to use them due to the bound of Internet protocol. In this paper, a new Internet broadcasting technology for access network is proposed by employing IP address translation function in base station. There are some advantages such as; no need to allocate IP address to receiver, no need to know web site address, and reduction of traffic for server and network. Especially, this technology is very proper to wireless Internet local information broadcasting.

Design of NAND Flash Translation Layer Based on Valid Page Lookup Table (유효 페이지 색인 테이블을 활용한 NAND Flash Translation Layer 설계)

  • 신정환;이인환
    • Proceedings of the IEEK Conference
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    • pp.15-18
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    • 2003
  • Flash memory becomes more important for its fast access speed, low-power, shock resistance and nonvolatile storage. But its native restrictions that have limited 1ifetime, inability of update in place, different size unit of read/write and erase operations need to managed by FTL(Flash Translation Layer). FTL has to control the wear-leveling, address mapping, bad block management of flash memory. In this paper, we focuses on the fast access to address mapping table and proposed the way of faster valid page search in the flash memory using the VPLT(Valid Page Lookup Table). This method is expected to decrease the frequency of access of flash memory that have an significant effect on performance of read and block-transfer operations. For the validations, we implemented the FTL based on Windows CE platform and obtained an improved result.

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Implementation of Network Address Translator (네트워크 주소변환 장치 구현)

  • Park Byoung-soo;Cho Tae-kyung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.5 no.6
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    • pp.526-532
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    • 2004
  • The insufficiency on IP address cause to develope a new internet protocol, IPv6 that the length of address field is expanded. But there are actually many problems on applying and operating this standard for internet. Though NAT(Network Address Translation) is instead of it, NAT has the characteristics that is not allowed to access from outside. This is a big merit in security but a week point because the access from outside should be allowed when a small organization operate web sever or mail server. Therefore, this paper proposes the expanded NAT which can solve such problems as modifying the table of NAT. Furthermore, the function of existing VPN(Virtual Private Network) will be acceptable partly through such a method that provide the linkage among VPNs.

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The Efficient Scenario of Solving NAT Traversal in the IMS (IMS에서 효율적인 NAT Traversal 해결 시나리오)

  • Han, Seok-Jun;Lee, Jae-Oh;Kang, Seung-Chan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.4
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    • pp.1935-1941
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    • 2013
  • We can use NAT(Network Address Translation) technology to solve the lack of IP address. The problem of NAT traversal is happened when the filtering characteristics of NAT remove the packet that has no binding in the address translation table of NAT. There were many kinds of way to solve these problems by using additional device. Lately, network market is changed into integrating wired and wireless network by the IMS(IP Multimedia Subsystem). The IMS integrates to control network of wired and wireless network, has emerged to control convergence network effectively. Lately, the additional devices like IBCF(Interconnection Border Control Function) and IBGF(Interconnection Border Gateway Function) are used to solve the NAT traversal problem in the IMS. In this paper, we propose the solution of NAT traversal using P-CSCF without any additional equipment in the IMS.