an open-source Linux distribution aimed at routers. - openwrt.org / r/openwrt

• Van Tech Corner

Raspberry-pi support

• Raspberry Pi as a home router / OpenWrt installation
  • OpenWrt installation - for Raspberry Pi 4, you need to download the latest development build.
    • get rpi-4-ext4-factory.img.gz, unzip it
    • copy image on sd card, dd if=rpi-4-ext4-factory.img of=/dev/mmcblk0 bs=4096 ; sync
    • expand partition

$ sudo e2fsck -f /dev/sdc2
$ sudo cfdisk /dev/sdc
$ # sudo resize2fs /dev/sdc2 # unnecessary

• edit set ip in /etc/config/network

config interface 'loopback'
	option ifname 'lo'
	option proto 'static'
	option ipaddr '127.0.0.1'
	option netmask '255.0.0.0'

config globals 'globals'
	option ula_prefix 'auto'

config interface 'lan'
	option type 'bridge'
	option ifname 'eth0'
	option proto 'static'
	option ipaddr '192.168.0.250'
	option netmask '255.255.255.0'
	option ip6assign '60'
	option gateway '192.168.0.254'             
	option dns '212.27.40.240 212.27.40.241'

• ssh root@192.168.1.1 and reconfigure ssh then configure dropbear
  • Public SSH login keys for dropbear are stored in /etc/dropbear/authorized_keys

$ ssh-copy-id -i .ssh/id_rsa.pub root@192.168.1.1
$ ssh root@192.168.1.1
root@MyOpenWrt:~# mv /root/.ssh/authorized_keys /etc/dropbear/

Dropbear key-based authentication

$ uci set dropbear.@dropbear[0].PasswordAuth="0"
$ uci set dropbear.@dropbear[0].RootPasswordAuth="0"
$ uci commit dropbear
$ /etc/init.d/dropbear restart

Webserver GUI

opkg update
opkg install luci-ssl-nginx
/etc/init.d/nginx enable

Tools

opkg install usbutils	# lsusb
opkg install usbutils	# lshw

Temperature Monitoring

install Luci statistics, collectd and especially collectd mod sensors and thermal

Network

• 5 Gbps Ethernet on the Raspberry Pi Compute Module 4

Bandwidth policy

• SQM - ‘opkg install luci-app-sqm’

Monitor home network traffic

Network Ad Blocking with Pi-hole and OpenWrt

• How To Setup Pi-hole with OpenWrt

Wifi

$ wifi
'radio0' is disabled

$ wifi status
...

• Compile drivers for …
  • It’s not an easy thing to do since OpenWrt is not set up to let you compile things inside the device, you can only use the build system to cross-compile.
  • OpenWrt does not support dkms system for building and using out-of-tree Linux drivers so you cannot use that source but you would need to get a straight kernel patch and adapt it to the kernel used in OpenWrt, that’s all sorts of painful.
• Setting up a Raspberry Pi as a WiFi access point
• Create a routed Access Point with Raspberry Pi and OpenWrt
• Secure and turn on Wi-Fi
• OpenWRT and WLAN-USB-Sticks
• How to setup a RTL881cu USB Wifi adapter with the Raspberry Pi 4
• External Antenna / 1 / 2

Atlernative setup

• AdaFruit (2018)
• Installing OpenWRT on a Raspberry Pi as a New Home Firewall (2013)