I got another wifi adapter to use as a sniffer.  It is the Alfa AC1900, and now 
I’m able to see the data packets.  Apparently, some of the rates were not 
supported by the awus036neh.


From: Bill Walters <leaf_of_i...@yahoo.com> 
Sent: Friday, November 1, 2019 8:51 AM
To: netsniff-ng@googlegroups.com
Subject: Not seeing all traffic


I'm trying to capture WiFi packets between a Windows 10 machine (client) and a 
Linux controller (AP) using 802.11b/g/n in the 2.4GHz range on channel 1.  I'm 
running an iperf3 test between the client and the AP.  I can capture traffic, 
but the capture doesn't seem to collect nearly as much data as is passing 
between the client and AP.  Do I have something set up wrong?


I've got an Alfa awus036neh USB WiFi adapter on a separate laptop booted into 
Kali Linux (2019.3).  I start the adapter in monitor mode using the following 
commands, and start netsniff-ng.  The details are in the attached text file.


root@kali:~# airmon-ng check kill

root@kali:~# airmon-ng start wlan1

root@kali:~# iw wlan1mon set channel 1 HT20

root@kali:~#  netsniff-ng --in wlan1mon --out dump.pcap --silent --bind-cpu 1


iperf3 reports 10's of MB being transferred during the recording (5MBytes per 
second), but the dump.pcap file is less than 1MB.  It doesn't seem that 
everything is being recorded.  Is the data being stripped out?  I'm not 
specifying a filter.

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