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研究生:王俊傑
研究生(外文):Chun-Chieh Wang
論文名稱:利用IP-Decoupling的方法支援主機行動性
論文名稱(外文):An IP-Decoupling Approach to Host Mobility
指導教授:曾建超曾建超引用關係
指導教授(外文):Chien-Chao Tseng
學位類別:碩士
校院名稱:國立交通大學
系所名稱:資訊工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:40
中文關鍵詞:行動計算無線網路
外文關鍵詞:host mobilitymobile IPwireless internet
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這篇論文提出一個利用IP-Decoupling的方式來使主機支援在無線網路上的行動性,本論文提出此方法的設計,實作與效能評估。在目前的網路架構中,網路位址有兩個作用,一個是在底層提供主機的位置資訊,另外一個則是提供主機上層一個獨一無二的識別記號。因為網路位址同時有這兩個作用,使目前的網路協定堆疊並不適合行動網路,因此我們提出IP-Decoupling的方式把目前的網路位址分成兩部分,上層使用的網路位址是用來識別主機,而下層所用的網路位址是用來代表目前所在的位置,並提出一個位址對應表來對應兩個位址。我們也利用了目前的DNS系統和Secure DNS Update來作找尋目前行動主機位置的主要機制,因此本方法並不需要任何特殊的伺服器的幫助即可支援主機行動性。和目前IETF所提出的Mobile IP比較,本方法封包的傳送路徑為最佳化,且改善了Mobile IP的幾個缺點,和Mobile IPv6相比,封包的負擔比較小,因此有較佳的效能。除此之外,本方法幾乎不需要修改就可以使用在IPv6的網路上面,因此可以讓主機在IPv4和IPv6的網路之間漫遊。另外,本方法也可以支援兩個不同網路介面(例如無線區域網路和電話網路)之間的漫遊。

This thesis presents the design, implementation, and performance evaluation of an IP-decoupling (IPD) approach that can support host mobility for wireless Internet. An IP address in the current TCP/IP protocol stack serves dual purposes: a routing directive in the network-layer and an end-point identifier in the transport or upper-layer. This coupling of the routing directive and the end-point identifier makes it difficult or unnatural to support host mobility in Internet. Although IETF has proposed Mobile IP (MIP) to support host mobility, the performance of Mobile IP is still not good enough. Therefore we propose a new IPD approach that can support host mobility by decoupling the IP layer routing directive from the transport layer identification. Similar to MIP protocols, when an MN changes its point of network attachment, the MN will obtain a new IP address as its new care-of address (COA) in IPD approach. However the MN uses secure DNS updates, instead of MIP registration messages, to inform the home domain DNS of the changes in care-of IP addresses. As a consequence, the IP routing directive of the MN can be acquired through a normal DNS query. Besides, each IPD-capable host is equipped with an address map table (AMT) to record the bindings between IP-layer routing directives and transport-layer identifiers. The binding information of AMT can be updated through ICMP message exchange directly between two communication peers with without the support of a third party. Therefore the routing path of the IPD approach is always optimized as it is in Mobile IPv6. Analysis results also show that the packet overhead in IPD approach is lower than that in both Mobile IPv4 and IPv6. Besides, the IPD approach can be easily adopted, with little modification, to support host mobility in IPv6 networks, or IPv4 and IPv6 co-existed networks. Furthermore, IPD approach can also be used to support mobility in an overlaid wireless network such as a wireless LAN/GPRS two-tier wireless network.

Chapter 1 Introduction 1
Chapter 2 Related Work 2
2.1 Mobile IP 2
2.1.1 Overview 2
2.1.2 Agent Discovery 3
2.1.3 Registration 3
2.1.4 Tunneling 3
2.1.5 Disadvantages of Mobile IP 3
2.2 Mobile IPv6 4
2.2.1 Overview 4
2.2.2 Binding Update and Packet Delivery Procedure 5
2.2.3 Disadvantage of Mobile IPv6 7
2.3 Loose Source Routing Scheme 8
2.4 End-to-End Approach 8
2.5 ICMP-like Redirection Message Approach 8
Chapter 3 The IP-Decoupling Approach 9
3.1 Introduction 9
3.2 HID Option 10
3.3 NID and HID Addresses Assignment 11
3.3.1 Network Identifier Address (NID Address) 11
3.3.2 Host Identifier Address (HID Address) 11
3.4 Locating a Mobile Node 13
3.5 Address Mapping 14
3.5.1 Host-oriented Method 14
3.5.2 Session-oriented Method 17
3.5.3 Hybrid Method 20
Chapter 4 Implementation Issues 21
Chapter 5 Performance Evaluation 22
5.1 Simulation Results 22
5.1.1 Transmission Time 23
5.1.2 Packet Error Rate 24
5.3 Overhead of IPD Approach 26
5.3.1 HID Option Overhead 26
5.3.2 Operation Overhead 28
5.3.3 Packet Loss during Handoffs 28
Chapter 6 Discussions and Remarks 29
6.1 Multi-tier System with IPD Approach 29
6.2 Mobility between IPv4 and IPv6 Environment 29
6.3 Backward Compatibility 30
6.4 Security Issue 30
6.5 Disadvantages of Our IPD Approach 31
Chapter 7 Conclusion and Future Work 32
References 33

[1] D. Eastlake 3rd, “Secure domain name system dynamic update,” RFC 2137, IETF, April 1997.
[2] P. Ferguson and D. Senie, “Network ingress filtering: Defeating denial of service attacks which employ IP source address spoofing,” RFC 2267, IETF, January 1998.
[3] S. Gupta and A.L.N. Reddy, “A client oriented, IP level redirection mechanism,” Proc. IEEE Infocom ’99, March 1999.
[4] D.B. Johnson, “Mobile host Internetworking using IP loose source routing,” Tech. Rep. CMU-CS-93-128, Carnegie Mellon Univ., Pittsburgh, PA, February 1993.
[5] D.B. Johnson, C. Perkins and J. Arkko, “Mobility Support in IPv6,” Internet Draft, IETF, May 2002, (working in progress).
[6] G. Montenegro, “Reverse tunneling for Mobile IP, revised,” RFC 3024, IETF, January 2001.
[7] P. Mockapetris, “Domain names — concepts and facilities,” RFC 1034, IETF, November 1987.
[8] P. Mockapetris, “Domain names — implementation and specification,” RFC 1035, IETF, November 1987.
[9] C.E. Perkins, “IP mobility support,” RFC 2002, IETF, October 1996.
[10] C.E. Perkins, “IP encapsulation within IP,” RFC 2003, IETF, October 1996.
[11] C.E. Perkins, “Minimal encapsulation within IP,” RFC 2004, IETF, October 1996.
[12] C.E. Perkins and D. B. Johnson, “Route optimization in Mobile IP,” Internet Draft, IETF, September 2001, (working in progress).
[13] A.C. Snoeren and H. Balakrishnan, “An end-to-end approach to host mobility,” ACM MobiCom 2000, Boston, MA, August 2000.
[14] F. Teraoka, Y. Yokoro, and M. Tokoro, “A network architecture providing host migration transparency,” Proceedings of ACM SIGCOMM 91, pp.209-220, September 1991.
[15] F. Teraoka, K. Uehara, H. Sunahara, and J. Murai, “VIP: A protocol providing host mobility,” Communications of the ACM, August 1994.
[16] S.L. Tsao and J.C. Liu, “Mobility support for IPv4 and IPv6 Interconnected Networks based on Dual-Stack Model,” Internet Draft, IETF, February 2000.

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