Changes
    #
    Add NAT in to kernel
    #
    Remove WiFi support
    Remove F2FS support


External docs
    #
    https://tewarid.github.io/2014/09/03/linux-nat-routing-on-raspberry-pi-with-buildroot.html
    https://linuxconfig.org/how-to-turn-on-off-ip-forwarding-in-linux