Finally, I have finished setting up my Raspberry Pi 2 as a WLAN gateway.

I did configurations mostly based on these instructions, but with several information specific to my Wi-Fi dongle from the following web sites:

1. Custom modules for RealTek 8192cu Usb Wifi Dongle
   • http://wannabe-nerd.tweakblogs.net/blog/10870/wifi-access-point-using-a-realtek-8192cu-based-usb-wifi-dongle-with-a-raspberry-pi.html
   • https://bogeskov.dk/UsbAccessPoint.html
2. Installation of kernel source
3. Setting up NAT using ufw