Re: [問題] 企業無線網路的架設問題
※ 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
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06/12 21:44, , 1F
06/12 21:44, 1F
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