Realtek wifi packet injection issue

Kali Linux Forums Kali Linux Troubleshooting
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Hi, I’m using Kali Linux and I have two network interfaces:

wlan0: This is my internal laptop Wi-Fi card (Realtek RTL8852BE – PCIe)

wlan1: This is my external USB Wi-Fi adapter (TP-Link Archer T2U Plus – RTL8821AU)

:white_check_mark: I am able to connect to the internet using wlan0.

:magnifying_glass_tilted_left: I enabled monitor mode on wlan1 and tried to test packet injection using:

sudo aireplay-ng --test wlan1

:cross_mark: It shows:

No APs found, injection not working.

But when I run the same injection test on wlan0, it strangely says:

Injection is working.

:counterclockwise_arrows_button: This is confusing because wlan0 is the internal card (RTL8852BE) which normally does not support injection, while wlan1 (RTL8821AU) should support monitor + injection.

Also, wlan1 goes into monitor mode, but shows Link Quality: 0 and captures no APs in airodump-ng.

:red_question_mark:Why is injection showing as working on wlan0 and not on wlan1, even though wlan1 is a USB adapter with monitor mode enabled?

2

Since this comes up all the time, excuse the shortness of the answer and feel free to look it up on the forum.

Realtek wifi chipsets are hot garbage - avoid them at all cost.