Monitor interface added to Master interface

Lara Deek laradeek at cs.ucsb.edu
Tue Mar 29 21:02:03 EDT 2011


Hello,

I am running tcpdump on a monitor interface. The issue that I am facing is
that the monitor interface that is added to the master (AP mode) interface
by running hostapd does not report SNR on beacon messages, and does not
receive packets destined to the master interface. However, a monitor
interface added to a managed mode interface (not using hostapd) reports
packet SNR and captures packets destined to the managed interface.

Is there a reason for this difference? How is the monitor interface
created/setup by hostapd, and is it not setting the interface to promiscuous
mode?

Regards,
Lara
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