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Linux distribution for embedded devices


search for your router model in: to find specific instructions


Install LUCI web interface

opkg update
opkg install luci
/etc/init.d/uhttpd enable
/etc/init.d/uhttpd start

reach the webiface at http://router_IP/

Install Bash & setup .bashrc

opkg update
opkg install bash

edit /etc/passwd and replace /bin/ash for /bin/bash in the line starting with root:

echo ". $HOME/.bashrc" > /root/.bash_profile

put your custom .bashrc in /root/.bashrc

SSH publickey authentication

you can do this in the webiface or manually:

copy your key from your desktop to the router's /tmp/ dir:

scp ~/.ssh/ root@<router IP>:/tmp

log in to the router and move the key:

cat /tmp/ >> /etc/dropbear/authorized_keys
chmod 0600 authorized_keys

Reverse SSH publickey authentication - from router to desktop

a private key is autogenerated by dropbear in /etc/dropbear/dropbear_rsa_host_key

extract public key on the router:

dropbearkey -y -f /etc/dropbear/dropbear_rsa_host_key | grep ssh-rsa > /tmp/

add the content of this file to '~/.ssh/authorized_keys' on the remote box

log in with

ssh -i /etc/dropbear/dopbear_rsa_host_key user@remotebox

USB storage

USB2.0 kernel module installation:

opkg update
opkg install kmod-usb2
insmod ehci-hcd

package & filesystem modules installation:

opkg update
opkg install kmod-usb-storage kmod-usb-storage-extras kmod-scsi-generic e2fsprogs kmod-fs-ext4 kmod-fs-vfat 
opkg install block-mount block-extroot block-hotplug 

format usb drive:

FIXME testing ext4 options from

“Ext4 with block size of 4k, without journaling, but with additional parameters to encourage Ext4 to do the right thing with respect to the erasure block:”

mkfs.ext4 -O ^has_journal -E stride=2,stripe-width=1024 -b 4096 -L usbdata /dev/sdXY

auto mount on boot:

block-mount and block-hotplug will take care of boot and automount.

edit config in /etc/config/fstab - example with swap and data partition:

config global automount
      option from_fstab 1
      option anon_mount 1

config global autoswap
      option from_fstab 1
      option anon_swap 1

config mount
      option target   /mnt/sd
      option device   /dev/sdc2
      option fstype   ext4
      option options  rw,sync,noatime,nodiratime
      option enabled  1
      option enabled_fsck 1

config swap
      option device   /dev/sdc1
      option enabled  1
communitycloud/freifunk/openwrt.txt · Last modified: 2012/09/09 19:04 by tkilla