※ 引述《brianpcbest (FF4)》之铭言： : 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跑过一次.... : 已经修改过很多~.~ : DR.EYE跑完的结果根本不能看 第一段讲因802.11b 较为可靠,采用cisco的solution来取代proxim 第二段讲二台互相备援的NetMotion server负责DHCP工作 以及在中间处理client使用mobility软体与上层main network连线的工作 确保client不管是离开,standby,或是roaming到另一个BSS 重新连线时都会回复到上次断线的status 第三段讲roaming 的行为模式 给你个小建议,千万别用全文翻译,多看多查单字很快就不觉得原文很难了 -- 以上有错请指正 --

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