Difference between Monitor mode and Promiscuous mode

xiah_sunny

于 2011-12-09 09:26:40 发布

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文章标签： access network

本文详细介绍了无线网络适配器的两种特殊工作模式：监控模式和混杂模式。监控模式允许无线网卡捕获包而无需连接到接入点或ad-hoc网络，这对于不希望发送数据包的应用场景特别有用。另一方面，混杂模式则要求先与网络关联才能查看所有无线包。不是所有的无线驱动都支持这两种模式。

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Monitor mode enables a wireless nic to capture packets without associating with an access point or ad-hoc network. This is desireable in that you can choose to "monitor" a specific channel, and you need never transmit any packets. In fact transmiting is sometimes not possible while in monitor mode (driver dependent). Another aspect of monitor mode is that the NIC does not care whether the CRC values are correct for packets captured in monitor mode, so some packets that you see may in fact be corrupted.

Promiscuous mode allows you to view all wireless packets on a network to which you have associated. The need to associate means that you must have some measn of authenticating yourself with an access point. In promiscuous mode, you will not see packets until you have associated. Not all wireless drivers support promiscuous mode.