標題: 企業內網路移動式主機漫遊協定之研究
Research of Mobile Device Roaming Protocol in Intranet
作者: 江衍源
Yen-Yuan Chiang
鍾崇斌
Chung-Ping Chung
資訊科學與工程研究所
關鍵字: 移動式主機;漫遊協定;網路位址轉換;虛擬私人網路;Mobile Device;Roaming Protocol;Network Address Port Translation;Virtual Private Network
公開日期: 1998
摘要: 本論文主要是針對企業網路內的移動式主機,設計實作一相容於目前網路系統的協定,使其在不更改及不增加使用者主機網路協定模組的前提下,達成漫遊的功能,並且進一步對此系統做效能評估。 企業網路的特性,在其資源有限而集中,因此在網際網路位址不足的情況下,NAPT是一個用來解決網際網路位址不足的方法。它經常與 DHCP 伺服器伴隨在一起使用。對於使用者主機程式而言,這兩個協定的搭配,的確解決了在網際網路快速成長的過程中,網際網路資源不足及分配的問題,同樣的,這樣的協定可以應用到無線區域網路之中,動態調整移動式主機的資源;但是移動式主機在漫遊的過程中,會失去資源提供的原始來源,使得連線無法在不同存取點的涵蓋區域間換手(Handoff)。所以為了補足上述的缺點,本論文提出MNAPT(Mobile Network Address/Port Translation),NAPTIEP(Network Address/Port Translation Information Exchange Protocol)及 MHLIEP(Mobile Host Location Information Exchange Protocol)三個協定實作驗證,並對系統效能做出分析評估。 在另外一方面,對於企業網路與企業網路間的網路連線而言,PPTP 是一個新興的隧道(Tunnel)協定,微軟的 Win95/98/NT 均使用此協定連線,藉以達成某部份 VPN 的功能。當 NAT 與 PPTP 協定整合時,會遇到資源重覆使用的問題,因此針對移動式主機如何在這樣的環境運作,本論文亦提出一整合的方法,可以讓網路資源重覆運用,藉以讓經常在各個企業體漫遊的使用者,可以無須顧慮網路資源的重覆及分配問題,以既有的網路系統運作。這部份亦經實作驗證成功。 最後,針對企業網路在傳送多媒體資料時,路徑中的交換裝置如何提供一定程度的傳送品質保證,本論文提出一個針對 TCP/IP 協定如何達到該項功能的設計方法,並以模擬系統驗證後,証明其效果可行(註:該方法,專利公告中)。
The research focuses on mobile device roaming protocol design and implementation in Intranet. We make the design compatible with TCP/IP protocol suite for different network operating system without extra agent program. And give a mathematical evaluation model to predict system performance. Resource of Intranet is usually limited by some constrains, such as IP address, network bandwidth, etc. NAPT is a technique to solve IP address problem; it uses private IP address to extend the IPv4 life cycle. NAPT always works with DHCP protocol because DHCP server can dispatch network parameters to workstation dynamically. These two protocols can apply to wireless network, also. However, the mobile devices will lose connection in roaming process. They need handoff procedure in NAPT environment. Therefore, we design three protocols to meet the handoff requirement in Intranet. They are MNAPT(Mobile Network Address/Port Translation), NAPTIEP(Network Address/Port Translation Information Exchange Protocol), and MHLIEP(Mobile Host Location Information Exchange Protocol). The rapid growth of Internet will make individual Intranet connect to form a big enterprise network. VPN(Virtual Private Network) is developed for this goal. In this topic, Microsoft proposes PPTP(Point-to-Point Tunneling Protocol)to work in Win95/98/NT. Cisco proposes L2TP for Internet Draft. But, there are resource conflict problems in VPN and NAPT integration. The thesis gives new mechanism to overcome the problems for same private IP address usage. We design and integrate the protocol for enterprise network. It successfully helps the roaming user to transparently work in the enterprise network. Finally, we consider the QoS problem in multimedia communication, and filed a patent for that.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT870392107
http://hdl.handle.net/11536/64136
Appears in Collections:Thesis