Version 18 (modified by benoitg, 14 years ago)

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Installing the gateway on a Linksys WRT54G FAQ

Due to the lightness of the Wifidog client it is often installed inside the linksys WRT54G. This is why it has it's own FAQ.

The easy way

You are not comfortable with linux and don't know how to do all this compiling stuff.

You can use an OpenWRT and WiFiDog compiled by someone else. They MUST be compiled for your specific version of OpenWRT. Note that the .ipk packages on sourceforge, or ones you built from source yourself are the only packages we will support. If you use package distributed by another organization, you will have to ask them for support.

Please note that the above saves you from the knowledge and time needed to compile and produced these binary files. It is however no magical cure for linux illiteracy. You need to be proficient enough in a unix environment to be able to telnet/ssh into the router and perform the outlined installation and configuration tasks. If you do not feel comfortable doing this we advise you consult with someone who is proficient in linux and networking.

Building from source for OpenWRT

See doc/install/gateway

The long way (Note: The following is OBSOLETE, and needs a good update, it has changed a lot in more recent versions of openwrt benoitg 2006-01-18)

Q: What do I need ?

A: You will need to have basic/full proficiency in a Linux environment

You need to re-flash your router with a hacker-friendly firmware called  OpenWRT. Follow the  user guide on the OpenWRT site to get this part done.

Do not proceed until you've completed the above. We also recommend you spend some time familiarizing yourself with your new router's OS before introducing Wifidog into that environment. This especially includes the nvram settings, network interfaces and existing interface bridges.

Q: Pre-installation

A: The same rules apply as the pre-installation in a non-WRT54G environment above. Do not proceed until you've satisfied them. In summary: Make sure EVERYTHING works first.



Installation of the client on the WRT54G is a bit tricky. The space limitations on the device mean there is no compiler in the OpenWRT operating system. That means that you must compile the client on an external machine then transfer the compiled form onto the router.

To complicate things more, if you compile your client regularly on a standard x86 desktop the produced binary will not run on the router due to the different type of processor (MIPS) on that router.

What is needed is called cross-compilation, In that scenario you use an architecture (such as your x86 desktop) to produce binaries explicitly designed to run on a different architecture (your MIPS router).

The above was the bad news since it makes things sound complicated. The good news is that it's not too complicated and we've built scripts to make this a snap for you. As a matter of fact, you've already done this before!

Remember when you followed the OpenWRT building instructions ? Without knowing it, you already cross-compiled stuff! You used your desktop to cross-compile an entire operating system for the MIPS architecture which resulted in one compressed firmware image you installed on your router.

Compiling a MIPS-friendly WiFiDog

  1. Download the latest  WiFiDog tarball from sourceforge.
  2. Uncompress the tarball, enter the directory
  3. Run the following, replacing /usr/local/openwrt/ with wherever you unpacked the OpenWRT tarball earlier:
    ipkg/rules BUILDROOT=/usr/local/openwrt/

You're done. If all is well you should now have a new file named wifidog_1.1.0_mipsel.ipk (version number may be different depending on the tarball you downloaded).

Getting the new MIPS-friendly WiFiDog onto the router

The .ipk is a data file for the simple "ipkg/i-Package" package manager already on your router. All that's needed now is to copy that file onto your router. If you have installed the dropbear SSH daemon package on your router you can use scp on your desktop to copy the .ipk file to the router. Otherwise copy that file to any web server you have access to, then use wget on the router to download the file from the web server.

Either way, place the file in the /tmp/ directory on the router.

Actual installation

Once you have the .ipk file on the router, use this command to install it:

ipkg install /tmp/wifidog_1.1.0_mipsel.ipk

Once that is successful delete the .ipk file from /tmp/ to free the occupied memory.

Configuration, Running and Testing

Firewall rules

If you set up your OpenWrt?-powered router with a bridged network interface (default), the current firewall rules of OpenWrt do not permit to block all outgoing TCP/UDP ports except port 80 until a user has authenticated via WiFiDog's login page.

You are going to have to disable forwarding from the bridge interface to the wan interface in /etc/init.d/S45firewall:

# The following have been commented out for WiFiDog to work
# iptables -A FORWARD -i br0 -o br0 -j ACCEPT
# iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT

Important notes on the prior step!!'''

How to edit files, like the step above!

Summary: On the Linksys WRT-54GL (and most other devices, you'll be editing files on a READ-ONLY file system. Since the filesystem is a collection of symlinks to a readonly filesystem, you can't simply edit files -- they're readonly. Instead you have to delete the symlink, and copy the file so you have a writable version of the file to edit:

rm /etc/init.d/S45firewall
cp /rom/etc/init.d/S45firewall /etc/init.d/
vim /etc/init.d/S45firewall

(And no promises that the file will be named S45firewall - in the version if WebIF (OpenWRT) I'm using, it's S35firewall now. Use common sense...

That will get you there...

What else?

You'll need libpthread - that can be installed/downloaded from the Web interface of OpenWRT. WifiDog gateway won't run without it.

Well, it's the same as the earlier section in a non-WRT54G environment.

The intricate link between WiFiDog and OpenWRT

Repeat after me:


What does that mean ?

  1. If you downloaded and compiled OpenWRT yourself, download and compile WiFiDog yourself against the same buildroot - Do not use someone else's pre-compiled WiFiDog
  2. If you downloaded a pre-compiled OpenWRT firmware image:
    1. Ask the person who built it to compile WiFiDog for you against the same buildroot
    2. Or ask them for a copy of their OpenWRT buildroot so you may compile WiFiDog against it