root@kali:~# iw dev
phy#1
	Interface wlan1
		ifindex 4
		wdev 0x100000001
		addr 76:38:50:b4:7a:4f
		type managed
		txpower 20.00 dBm
phy#0
	Unnamed/non-netdev interface
		wdev 0x2
		addr 28:16:ad:c9:9d:61
		type P2P-device
		txpower 0.00 dBm
	Interface wlan0
		ifindex 3
		wdev 0x1
		addr 82:d4:86:49:73:24
		type managed
		txpower 0.00 dBm
		multicast TXQ:
			qsz-byt	qsz-pkt	flows	drops	marks	overlmt	hashcoltx-bytes	tx-packets
			0	0	0	0	0	0	0	00
root@kali:~# airmon-ng check kill

Killing these processes:

  PID Name
 1105 wpa_supplicant

root@kali:~# airmon-ng start wlan1


PHY	Interface	Driver		Chipset

phy0	wlan0		iwlwifi		Intel Corporation Wireless 8260 (rev 3a)
phy1	wlan1		rt2800usb	Ralink Technology, Corp. RT2870/RT3070

Failed to set wlan1mon up using ip

		(mac80211 monitor mode vif enabled for [phy1]wlan1 on [phy1]wlan1mon)
		(mac80211 station mode vif disabled for [phy1]wlan1)

root@kali:~# iw dev
phy#1
	Interface wlan1mon
		ifindex 5
		wdev 0x100000002
		addr 00:c0:ca:95:fa:30
		type monitor
		txpower 20.00 dBm
phy#0
	Interface wlan0
		ifindex 3
		wdev 0x1
		addr 82:d4:86:49:73:24
		type managed
		txpower 0.00 dBm
		multicast TXQ:
			qsz-byt	qsz-pkt	flows	drops	marks	overlmt	hashcol	tx-bytes	tx-packets
			0	0	0	0	0	0	0	0		0
root@kali:~# airmon-ng stop wlan1mon

PHY	Interface	Driver		Chipset

phy0	wlan0		iwlwifi		Intel Corporation Wireless 8260 (rev 3a)
phy1	wlan1mon	rt2800usb	Ralink Technology, Corp. RT2870/RT3070

		(mac80211 station mode vif enabled on [phy1]wlan1)

		(mac80211 monitor mode vif disabled for [phy1]wlan1mon)

root@kali:~# airmon-ng start wlan1


PHY	Interface	Driver		Chipset

phy0	wlan0		iwlwifi		Intel Corporation Wireless 8260 (rev 3a)
phy1	wlan1		rt2800usb	Ralink Technology, Corp. RT2870/RT3070

		(mac80211 monitor mode vif enabled for [phy1]wlan1 on [phy1]wlan1mon)
		(mac80211 station mode vif disabled for [phy1]wlan1)

root@kali:~# iw dev
phy#1
	Interface wlan1mon
		ifindex 7
		wdev 0x100000004
		addr 00:c0:ca:95:fa:30
		type monitor
		channel 10 (2457 MHz), width: 20 MHz (no HT), center1: 2457 MHz
		txpower 20.00 dBm
phy#0
	Interface wlan0
		ifindex 3
		wdev 0x1
		addr 82:d4:86:49:73:24
		type managed
		txpower 0.00 dBm
		multicast TXQ:
			qsz-byt	qsz-pkt	flows	drops	marks	overlmt	hashcol	tx-bytes	tx-packets
			0	0	0	0	0	0	0	0		0
root@kali:~# iw wlan1mon set channel 1 HT20
root@kali:~# netsniff-ng --in wlan1mon --out dump.pcap --silent --bind-cpu 1
Running! Hang up with ^C!

           0  packets incoming (0 unread on exit)
           0  packets passed filter
           0  packets failed filter (out of space)
          20  sec, 428739 usec in total
		  
***Unplugged and re-plugged the Alfa WiFi adapter that was wlan1
		  
root@kali:~# iw dev
phy#2
	Interface wlan1
		ifindex 8
		wdev 0x200000001
		addr 00:c0:ca:95:fa:30
		type managed
		txpower 0.00 dBm
phy#0
	Interface wlan0
		ifindex 3
		wdev 0x1
		addr 82:d4:86:49:73:24
		type managed
		txpower 0.00 dBm
		multicast TXQ:
			qsz-byt	qsz-pkt	flows	drops	marks	overlmt	hashcol	tx-bytes	tx-packets
			0	0	0	0	0	0	0	0		0
root@kali:~# airmon-ng start wlan1


PHY	Interface	Driver		Chipset

phy0	wlan0		iwlwifi		Intel Corporation Wireless 8260 (rev 3a)
phy2	wlan1		rt2800usb	Ralink Technology, Corp. RT2870/RT3070

		(mac80211 monitor mode vif enabled for [phy2]wlan1 on [phy2]wlan1mon)
		(mac80211 station mode vif disabled for [phy2]wlan1)

root@kali:~# iw wlan1mon set channel 1 HT20
root@kali:~# iw dev
phy#2
	Interface wlan1mon
		ifindex 9
		wdev 0x200000002
		addr 00:c0:ca:95:fa:30
		type monitor
		channel 1 (2412 MHz), width: 20 MHz, center1: 2412 MHz
		txpower 20.00 dBm
phy#0
	Interface wlan0
		ifindex 3
		wdev 0x1
		addr 82:d4:86:49:73:24
		type managed
		txpower 0.00 dBm
		multicast TXQ:
			qsz-byt	qsz-pkt	flows	drops	marks	overlmt	hashcol	tx-bytes	tx-packets
			0	0	0	0	0	0	0	0		0
root@kali:~# netsniff-ng --in wlan1mon --out dump.pcap --silent --bind-cpu 1
Running! Hang up with ^C!

        9349  packets incoming (11 unread on exit)
        9360  packets passed filter
           0  packets failed filter (out of space)
      0.0000% packet droprate
          15  sec, 431698 usec in total