TCPDump和Signal

Question

我一直在用TCPDump做一些实验，但我遇到了一个问题。以以下捕获为例：

2014-10-12 18:46:21.351515 7314729679us tsft 1.0 Mb/s 2432 MHz 11b -53dB signal antenna 1 0us BSSID:00:14:bf:96:b7:10 DA:ff:ff:ff:ff:ff:ff SA:00:14:bf:96:b7:10 Beacon (Style) [1.0* 2.0* 5.5* 11.0* 18.0 24.0 36.0 54.0 Mbit] ESS CH: 11, PRIVACY
2014-10-12 18:46:21.453908 7314832079us tsft 1.0 Mb/s 2432 MHz 11b -34dB signal antenna 1 0us BSSID:00:14:bf:96:b7:10 DA:ff:ff:ff:ff:ff:ff SA:00:14:bf:96:b7:10 Beacon (Style) [1.0* 2.0* 5.5* 11.0* 18.0 24.0 36.0 54.0 Mbit] ESS CH: 11, PRIVACY
2014-10-12 18:46:21.556314 7314934481us tsft 1.0 Mb/s 2432 MHz 11b -32dB signal antenna 1 0us BSSID:00:14:bf:96:b7:10 DA:ff:ff:ff:ff:ff:ff SA:00:14:bf:96:b7:10 Beacon (Style) [1.0* 2.0* 5.5* 11.0* 18.0 24.0 36.0 54.0 Mbit] ESS CH: 11, PRIVACY
2014-10-12 18:46:21.617142 7314995309us tsft 1.0 Mb/s 2432 MHz 11b -69dB signal antenna 1 0us BSSID:08:60:6e:64:6f:78 DA:ff:ff:ff:ff:ff:ff SA:08:60:6e:64:6f:78 Beacon (ASUS) [1.0* 2.0* 5.5* 11.0* 9.0 18.0 36.0 54.0 Mbit] ESS CH: 3, PRIVACY
2014-10-12 18:46:21.632972 7315011135us tsft 1.0 Mb/s 2432 MHz 11b -79dB signal antenna 1 0us BSSID:00:1c:10:27:bf:56 DA:ff:ff:ff:ff:ff:ff SA:00:1c:10:27:bf:56 Beacon (BATMAN) [1.0* 2.0* 5.5* 11.0* 18.0 24.0 36.0 54.0 Mbit] ESS CH: 6, PRIVACY

如果我捕获一个包，包中的信号值代表什么？它代表的是数据包的发送者和接收者之间的信号值，还是正在进行捕获的设备的发送者的信号强度？如果是前者，有没有办法计算出设备(不一定是AP)对我的地雷的信号强度？

谢谢

Answer 1

它是发送器对执行捕获的设备的信号强度。(将发送方的信号强度发送到接收方的唯一方法是在接收方捕获；这包括“远程捕获”，即接收方将数据包的副本发送到运行捕获应用程序的机器。)