※ 引述《brianpcbest (FF4)》之銘言： : To overcome the problems with their original WLAN and reap the potential : benefits listed earlier earlier in this case study, ST. Luke's made two : changes[CONR03]. First, the hospital phased out the Proxim APs and replaced : them with Cisco Aironet (WWW.aironet.com) APs. The Cisco APs, using IEE : 802.11b, operate at11Mbps. Also, the Cisco APs use direct sequence spread : spectrum (DSSS), which is more reliable than the frequency-hopping technique : used in the Proxiom APs. : The second measure taken by St Luke's was to acquire a software solution from : NetMotion Wireless(netmotionwireless.com) called Mobility. The basic layout : of the Mobility solution is shown in Figure V.1. Mobility software is : installed in each wireless client device (typically a laptop or handheld) and : in two NetMotion servers whose task is maintain connections. The two severs : provide a backup capability in case one sever fails. The Mobility software : maintains the sate of an application even is a wireless device moves out of : range, experiences interference, or switches to standby mode. When a user : comes back into ranger or switches into active mode, the user's application : resumes where it left off. : In essence, Mobility works as follows. Upon connecting, each Mobility client : is assigned a virtual IP address by the Mobility server on the wired network. : The Mobility sever manages network traffic on behalf of the client, : intercepting packets destined the client's virtual address and the client, : intercepting packets destined for the client's virtual address and forwarding : them to the client's current POP (point of presence) address. While the POP : address may change when the device moves to a different subnet, from one : converage area to another, or even from one network to another, the virtual : address remains constant while any connections are active. : 是先用DR.EYE跑過一次.... : 已經修改過很多~.~ : DR.EYE跑完的結果根本不能看 第一段講因802.11b 較為可靠,採用cisco的solution來取代proxim 第二段講二台互相備援的NetMotion server負責DHCP工作 以及在中間處理client使用mobility軟體與上層main network連線的工作 確保client不管是離開,standby,或是roaming到另一個BSS 重新連線時都會回復到上次斷線的status 第三段講roaming 的行為模式 給你個小建議,千萬別用全文翻譯,多看多查單字很快就不覺得原文很難了 -- 以上有錯請指正 --

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