by QwenAI | Verified on Arch Linux + NetworkManager ≥ 1.18

✅ Goal:

  • Apply the same spoofed MAC to all Wi-Fi connections (global).
  • Optionally set a custom DHCP hostname per network (e.g., Galaxy-A06 instead of Nix).
    🔧 Why it works: Uses NM’s native cloned-mac-address and dhcp-hostname — no race conditions, no leaks.

🔧 1. Global MAC Spoofing (All Wi-Fi)

Step 1: Create policy file

sudo mkdir -p /etc/NetworkManager/conf.d/
sudo tee /etc/NetworkManager/conf.d/99-global-mac-address.conf <<'EOF'
[keyfile]
unmanaged-devices=

[connection-wifi]
# Global default for *all* Wi-Fi connections
wifi.cloned-mac-address=DE:AD:BE:EF:CA:FE
EOF

📝 Replace DE:AD:BE:EF:CA:FE with your desired MAC (e.g., 90:01:C0:DE:13:37).

Step 2: Reload NetworkManager

sudo systemctl reload NetworkManager
# If changes don’t apply, restart:
# sudo systemctl restart NetworkManager

Step 3: Verify

macchanger -s wlp4s0
# ✅ Expected output:
# Current MAC:   DE:AD:BE:EF:CA:FE
# Permanent MAC: 9c:2f:9d:77:9c:67

💡 List active connections:
nmcli -g NAME con show --active

🎯 2. Per-Network Hostname Spoofing (Optional)

Make your device appear as a different device (e.g., phone, IoT) in the router UI:

nmcli con modify "MyWiFi" \
  ipv4.dhcp-hostname "Galaxy-A06" \
  ipv4.dhcp-send-hostname yes

✅ Replace:

  • "MyWiFi" → your connection name (e.g., "HUAWEI-5G-8BbD")
  • "Galaxy-A06" → any believable name (Smart-TV, Printer-HP, Lumen, etc.)

🔁 Reconnect to apply:

nmcli con down "MyWiFi" && nmcli con up "MyWiFi"

📌 Why it works: Most home routers (Huawei, TP-Link) display dhcp-hostname as Device Name — not the system hostname.

🔗 References