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How to build a router with Raspberry PI

The tutorial will build a router with Raspberry PI 3B, where the build-in Wifi and ethernet ports are LAN ports and a usb dongle D-link DWA-171 for connecting to Internet

The following things are required:

  1. Internet access. Can be wired or wireless. It’s used to install necessary packages
  2. A TF card. for Pi storage
  3. Pi 3B

Steps​

System Installation​

  1. Download Ubuntu 22.04 Server for Pi (As the time of writing). For 3B, use 64bit system.
  2. Write the downloaded file to a TF card
  3. Install Ubuntu to PI, no special config required. The default username/password are ubuntu/ubuntu. It will be created on the first bootup. Just wait for some time.
  4. Login, update the system
apt update
apt upgrade

Dongle driver installation​

  1. Install driver for DWA-171. 3B

https://github.com/aircrack-ng/rtl8812au

git clone <https://github.com/aircrack-ng/rtl8812au>
cd rtl8812au
sed -i 's/CONFIG_PLATFORM_I386_PC = y/CONFIG_PLATFORM_I386_PC = n/g' Makefile
sed -i 's/CONFIG_PLATFORM_ARM64_RPI = n/CONFIG_PLATFORM_ARM64_RPI = y/g' Makefile
sudo make dkms_install

removing and re-installing the driver may be required after upgrading the system, especially kernel upgrade

  1. If the driver is properly installed, a new interface should show up by ip a