FAQ after Installation of OpenWrt

There is no preset password in OpenWrt!
You need to set a password at your first login per telnet or the WebUI.


→ follow walkthrough_login

As you can see here development, there are always two branches which are being actively worked on. OpenWrt trunk, which is bleeding edge, codename 'Designated Driver', and the current stable release. Do

cat /etc/banner

to see the exact revision. Use that information for bug reports and questions in the forum. Also use it, to look up information yourself: https://dev.openwrt.org/browser

Install one, e.g. LuCI.

Unless you installed some other log daemons, OpenWrt uses by default busybox-klogd and busybox-syslogd for logging. Both use the same circular buffer, which can be accessed with the command


There are three WebUIs available. All are FOSS, thus you can adapt each of them to your specific needs and likings.

→ with opkg

→ with opkg

How do I free up some space?

By removing packages you installed after flashing OpenWrt onto your Router. You cannot remove packages on the SquashFS partition, which is included in the image you flashed.

Still not enough free space

This happens easily with recent firmware on 4MB Flash devices.
You can press-fit an OpenWrt image into this small flash by building your own image, with only the packages you need, tailored for your usecase.

You can build your own image

I need many MB (GB) free space

  • If you need even more space for package installation, you probably want Extroot.
  • If you just want simple USB storage for e.g. pictures, video, music, see usb-installing and usb-drives.

Please send reproducible bugs to our ticket system.

You can check yourself:

  1. The OpenWrt repositories are brows-able by web browser.
    Examples for ar71xx (replace ar71xx with the target fitting to your device):

Possible reasons:

  • it makes no sense to have this software in the repositories, because it is too bloated/not suited for embedded environments
  • nobody has thought on packaging this software for OpenWrt yet

Possible solutions:

  • create the package yourself: Creating a package
  • do nothing and wait until package becomes available

You will get the message “Cannot satisfy the following dependencies for...” if you are trying to install packages intended for a trunk build of OpenWrt on a different (older) version, i.e. the package in the trunk repository is for a newer kernel version than the kernel version on your flash.

  • As general advice, especially for inexperienced users: Go for the latest stable release version, not a trunk version, and the package repositories will match.
  • Try to install via opkg with option --force-depends (=Install/remove despite failed dependencies). Mind that this is likely to fail for kernel related packages (kmods).
  • Make local copy of trunk packages (not recommended, needs much space!)

Root cause: ??? See OpenWrt forum and add the root cause here --- tmomas 2015/12/23 21:10

Solution: ??? See OpenWrt forum and add the solution here --- tmomas 2015/12/23 21:10

see above: Howto connect behind another router?

That be because the firewall-package comes with a configuration already. Certain user chains are created, and packets put into them. When you then later try to catch packets in the INPUT chain, there won't be any, because they are being put into user chains (maybe something like wan_input, lan_input) before that.

Anytime you can type

iptables -L 

to see how things are currently setup, but best thing is, to always know your own setup.

cat /tmp/dhcp.leases
 cp -f /rom/etc/config/firewall /etc/config/firewall
/etc/init.d/firewall restart
  • netfilter
  • HTTP proxy server
  • ipset-dns

Something is wrong with your network configuration. Check Netmask, Gateway, DNS settings. → https://wiki.openwrt.org/doc/howto/internet.connection

Like on any Linux system, you can use crond. Please consult /etc/crontabs/root

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  • Last modified: 2023/03/12 05:38
  • by brlin