依然是无线网卡抓包问题
终于找来一个可以用于 DWL-G520 网卡的抓包驱动了。
来路，那个，比较曲折，不是网上search到的，不知道网上是否存在。
装上，未遇太大问题。
重启之后发现居然不能associate 上 AP了…折腾了半天也不行，为虾米呢？
查看 AiroPeek 帮助文件发现下面的两段话:
“When AiroPeek runs on a workstation, it puts the 802.11 WLAN hardware in Promiscuous Mode. In Promiscuous Mode, the workstation running AiroPeek accepts every packet, whether or not it is addressed to that workstation. AiroPeek installs itself parallel to any other stacks on the workstation, telling the driver it wants to see every packet of every description that it finds on the network. “（这个倒是和802.3一样的，也是将网卡至于混杂模式，抓取网络上所有的Packets）
“The machine on which AiroPeek is running will not send any acknowledgement, because Promiscuous Mode is strictly a listening mode. Radio transceivers cannot listen and send at the same time on the same frequencies because their own transmission would drown out any incoming traffic. “（这里写清楚了，无线收发器不能在同时同一频率发送/接收信号。因为发送的时候会淹没接收的信号。）
这个，又犯了经验主义错误鸟…不过奇怪了…为啥子不行喃？
难道这点和Ethernet的网卡不同呢？
为什么无线收发器不能在同一频率发送信号的同时接收信号呢？
首先来想想Ethernet网卡的结构.
1-3 2-6 两组线分别形成两个数据上传下载的通道。才可以同时发送数据的时候能达到接受数据监听网络的效果。
再来看看WLAN这边，为什么不能发送数据的时候同时监听网络呢？
Google 一下，得到答案:
原来，在WLAN中，对某个节点来说，其刚刚发出的信号强度要远高于来自其他节点的信号强度（有资料说1000倍以上），也就是说它自己的信号会把其他的信号给覆盖掉。
这样的话，也就是为什么802.11不能像802.3一样使用CSMA/CD的原因了。
简单说来，CSMA/CD要求站点在发送数据的同时通过电缆中的电压变化来监听网络，当数据发生碰撞时，电缆中的电压就会随着发生变化。一旦监听到的信号有较大变形，就能判断产生了冲突，则中断正在发送的数据帧。避免长时间占用信道。开始新一轮信道竞争。
由于WLAN不能根据信号强度来判断冲突，就只能无论正在传输的帧是否冲突而强行传完每个正在传送的帧。也就只能采取其他方式来降低冲突的危险(Collusion Avoidance，而不是Collusion Detect)
——————————————————————–
以上看法仅是个人观点，有错漏之处以及阐述不明确之处，还望不吝赐教！
Oasis Feng 于 2006-09-08 @ 01:59:13 留言 ：
也就是说单位面积部署的WLAN终端越多，互扰也越大了？
你对802.11的理解都已经上升到物理层，这方面的问题总算找到可以请教的人了～
阿磊 于 2006-09-08 @ 17:01:05 留言 ：
又长见识了，小戴的钻研精神让人佩服。看来我也得加强自己的专业知识，多思考思考为什么。
samueldsj 于 2006-09-12 @ 11:03:11 留言 ：
To Oasis,
“干扰”，偶的理解：干扰应该只指另外的工作在同频率的设备发出的信号对WLAN设备的影响。比如2.4G 附近的微波炉、无绳电话干扰802.11b.
关于“单位面积部署的WLAN终端越多”，应该算是共享带宽，CSMA/CA 就像Hub一样，一个讲时另外必须规避，这样就是共享带宽。而非Switch，隔离了广播域，大家可以同时一起向Switch讲。
To Ray,
简直过奖咯…偶其实不是喜欢研究的人…嘿嘿
mining lamp 于 2006-12-21 @ 17:05:48 留言 ：
强啊!
Robin 于 2007-03-07 @ 19:39:26 留言 ：
能不能给你联系方法呀，想请教一些问题，发我邮箱吧，多谢！
Robin 于 2007-03-07 @ 19:39:50 留言 ：
能不能给你联系方法呀，想请教一些问题，发我邮箱吧，多谢！
et1985@sina.com
ychfu123 于 2007-07-01 @ 17:51:33 留言 ：
DWL-G520 我也拭了很久了，也是没找到！！望大哥能给小弟发一份！ychfu123@163.com·
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