Masquerade one Wi-Fi network to another from a Mac

README.md

• Boot with a USB drive with an image from https://github.com/marcosfad/mbp-ubuntu
• Hold Option at the chime and pick the last one
• echo high > /sys/bus/pci/drivers/amdgpu/0000:??:??.?/power_dpm_force_performance_level
• apt install /usr/src/iso-firmware.deb
• modprobe -r brcmfmac
• modprobe brcmfmac
• systemctl restart network-manager
• Add this to /etc/NetworkManager/NetworkManager.conf:

[device]
wifi.scan-rand-mac-address=no

• Comment out all of /etc/NetworkManager/conf.d/wifi_backend.conf
• sudo systemctl restart NetworkManager
• Connect to Wi-Fi with the normal GUI
• apt install hostapd
• iw dev wlan0 interface add wlan1 type __ap
• cat /usr/share/doc/hostapd/examples/hostapd.conf > /etc/hostapd/hostapd.conf
• Edit that new file, setting interface=wlan1, ssid, wpa=2, wpa_passphrase, and wpa_key_mgmt=WPA-PSK
• systemctl unmask hostapd
• systemctl start hostapd
• ifconfig wlan1 inet 10.0.0.1/8
• sysctl -w net.ipv4.ip_forward=1
• iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
• systemd-inhibit cat
• Connect from clients with a static IP of 10.0.0.2 and up, and using a public DNS server