ALFA AWUS036ACH — High Power AC1200
一句話定位（One-liner）: The AWUS036ACH is ALFA's most famous adapter — a high-power RTL8812AU AC1200 dual-band USB 3.0 dongle with two 5 dBi external antennas. If you have ever seen a black ALFA in a Kali tutorial, it is probably this one. Monitor mode and packet injection are its party tricks; a DKMS driver build is the one-time entry fee.
規格總覽 (Spec overview)
| Item | Spec |
|---|---|
| Chipset | Realtek RTL8812AU |
| Wi-Fi class | AC1200 (300 + 867 Mbps) |
| Interface | USB 3.0 |
| Bands | 2.4 + 5 GHz |
| Antenna | 2 × external 5 dBi, RP-SMA |
| TX power | High power (500 mW class) |
| Linux driver | rtl8812au-dkms (community, not in-kernel) |
| Monitor mode | ✅ excellent |
| Packet injection | ✅ excellent |
Overview
The AWUS036ACH is the adapter that built the "hacker adapter" reputation for ALFA. It pairs the workhorse RTL8812AU radio with a genuinely high-power (500 mW) front-end and two replaceable 5 dBi antennas, wrapped in the yellow/black ALFA shell you recognize instantly. The distinction that matters for coursework: unlike lower-cost clones, its driver has years of aircrack-ng community hardening behind it, so monitor mode and packet injection just work once the driver is in place.
Its only real "cost" is that the RTL8812AU is not in the Linux kernel — the one-time DKMS build is the difference between this and the plug-and-play AWUS036ACM.
Install & drivers
The full walkthrough is on the RTL8812AU driver page — here is the 30-second version:
sudo apt install -y build-essential dkms git
cd /opt && sudo git clone https://github.com/aircrack-ng/rtl8812au.git
cd rtl8812au && sudo make dkms_install
sudo modprobe 8812au
Expected output: DKMS: install completed. then an Interface wlan0 after iw dev.
Advanced usage
Monitor mode + injection
sudo airmon-ng check kill
sudo airmon-ng start wlan0
sudo aireplay-ng --test wlan0mon
Expected output: Injection is working! and 30/30: 100%.
Replace the antennas for more range
The RP-SMA ports accept any ALFA antenna — upgrading to a panel or a higher-gain dipole boosts what the 500 mW radio can reach.
Compatibility
| Platform | Support | Notes |
|---|---|---|
| Kali Linux | ✅ | DKMS build; aircrack-ng repo tracks new kernels |
| Ubuntu | ✅ | DKMS; rock-solid on LTS |
| NetHunter / Android | 🔧 | Works on some kernels; not guaranteed |
| Windows | ✅ | Official driver; plug-and-play |
| macOS | ⚠️ | Driver needed; Apple Silicon limited |
Troubleshooting
| Symptom | Cause | Fix |
|---|---|---|
| DKMS build fails | New kernel vs stale repo | cd /opt/rtl8812au && sudo git pull && sudo make dkms_install |
| Adapter only in managed mode | Kernel stub grabbed it | Blacklist rtl8812au (see driver page) |
| Injection 0/30 | Empty channel | sudo iw wlan0mon set channel 6; test near an AP |
| Vanishes after reboot | Module not auto-loaded | Add 8812au to /etc/modules-load.d/alfa.conf |
Related resources
- RTL8812AU driver page — full setup + deep troubleshooting
- Kali setup guide
- AWUS036ACM — the in-kernel alternative (recommended for beginners)
- Adapter comparison
- Compatibility matrix