If you are one of the Asus WL500G Premium owners than it is possible to have problems with an USB drive connected the the unit: the HDD won't respond after a few MB written on disk and the unit restores it's factory settings.

Maybe you don't have problems like the one above but I am having problems with an Western Digital 500GB Essential Edition connected to the router so I decided to upgrade it's firmware to a DD-WRT version (v24 std final). It's a small Linux distribution that can be installed on many routers.

It brings a lot of new features:

  • Advanced banwidth management
  • DDNS support
  • Ad network support
  • Hotspot support
  • MAC Address Clone
  • Advanced DHCP options
  • Advanced Wireless configuration (mode, frequency, encryption, mac filter, etc)
  • XBOX and PSP connection
  • System log, traffic log, network map
  • SSH connection
  • A lot of filters for MAC, hostname, IP, etc.
  • Overclocking (!)
  • New web UI
  • Wake On Lan
  • etc.
See the difference between the classic Asus firmware and DDWRT:

Default Asus firmware

DD-WRT Firware

This guide is for Asus but a similar process can be applied to any router from the Supported Hardware List. Step 1 and 2 are different but the others are the same.

Very important: Before you read any further and/or try a firmware upgrade note that I am not responsible for any hardware/software/human (hope not) damages/injuries. Try to be sure that you have a backup supply for the router and PC because a power shortage in the middle of the upgrade process makes your router useless!

I recommend to read the entire guide before you try anything.

Before you begin make sure that you have the following:

  1. Asus WL500G Premium :)
  2. Windows Xp (I was not able to upgrade from Vista - Asus utilities are quite stupid)
  3. A pencil or pin because the reset button is almost impossible to be pressed with the finger.
  4. The original firmware from Asus Download (in case of upgrade failure)
  5. DD-WRT Firmware. Today, when I'm writing this post, the latest version is v24 final. Download it from here. I recommend "std generic" version.
  6. Asus Utility from the router CD or Asus download center.
  7. Putty or some other telnet client.
  8. Network cable (upgrade cannot be done by wireless!)
  9. Administrative rights on the workstation connected to the router.
  10. Some UPS for router and PC.
  11. Internet connection.
  12. Optional: external USB Drive (HDD, memory stick or card reader with card)

Step 1 (preparing the router):

Reset the router to it's default settings by holding the reset button - on the back of the unit - pressed for aprox. 5 seconds until the power led flashes.

Connect the network cable to router (one of the LAN ports) and PC. Set your PC IP address to . The last "1" (one) can be replaced with any number between 1 and 254.

Step 2 (installing the ddwrt firmware):

Disable the firewall on the PC from which you are upgrading and start Asus Firmware Restoration with administrative rights.

Now we need the router in Restore Mode. Unplug the power cord; press and hold (!!) the reset button while plugging the power cord. The power led should blink slowly.

In the firmware restoration utility select the bin file downloaded from ddwrt, choose upload and hope for success. Do not interrupt the process!!

After the process is complete the unit reboots. Start a web browser and type . If you see a popup window asking for credentials than you have done it. If not... you are quite unlucky :(

The default credentials for DDWRT are root/admin (user/password).

Step 3 (web interface configuration from DDWRT):

Configure whatever you need in the web interface and set the internet connection.

Asus WL500G Premium has 8 MB of ROM memory and the std version of the firmware uses ~3.6. We need to be able to use the rest of the space for the installation of drivers and other needed application.

The remaining space from ROM is called JFFS (Journalling Flash File System) and needs to be cleared before you can write on it.

Log in to the web interface of the router, go to Administration tab and choose on JFFS2: Enable and on Clean JFFS2: Enable. Apply the settings and reboot the router.

You should see, after reboot, that JFFS2 has some free space (the value might differ).

JFFS Free Space

Step 4 (installing software - telnet)

Install and start Putty. On protocol choose Telnet and type the IP of the router (default is When asked for credentials, the user name is "root" whether you changed it or not and the password is the one that you have set from web interface or "admin" by default.

ipkg is the application used for software installation and upgrade. The first thing that must be done is to update this application. For this type "ipkg update" in the console. If errors appear make sure that you are connected to Internet and restart the router.

Step 4.1 (USB and ext3 drivers):

Because ddwrt does not include USB drivers we need to manually install them. For this type the following command "ipkg -force-depends install kmod-usb-core kmod-usb2 kmod-usb-storage". If this command fails try it again - I had problems with it the first time.

If you are planning to add an USB drive that this one must be formated as ext2, ext3 or fat32. I recommend ext3 and if the drive is an HDD partition it like this: first partition 1 GB for optware (you'll see in a few moments what is this) and the rest as one big partition. Let's install the ext3 drivers "ipkg install kmod-ext3". Replace ext3 with "ext2" or "vfat" for other file systems.

Step 4.2 (prerequisites):

Not needed if no USB storage drive is available or don't want Optware.

We are going to use the first partition from the HDD to store optware. For this, mount the partition in the opt folder: "mount -t ext3 -o noatime /dev/discs/disc0/part1 /opt".

Let's install Optware: "wget http://pastebin.ca/raw/876251 -O - | tr -d '\r' > /tmp/optware-install.sh" and then "sh /tmp/optware-install.sh".

Output should be like this:

Checking system config ...
Using as default gateway.
Using the following nameserver(s):
Warning: local nameserver is different than gateway!
Check config or enter:
sed -i s/192.168.*/ /tmp/resolv.conf
to correct this.
Installing package uclibc-opt_0.9.28-13_mipsel.ipk ...
Connecting to ipkg.nslu2-linux.org[]:80
uclibc-opt_0.9.28-12 100% |***********************************************| 832 KB 00:00:00 ETA
Updating /opt/etc/ld.so.cache
/opt/sbin/ldconfig: can't create /opt/etc/ld.so.cache~ (No such file or directory)
Installing package ipkg-opt_0.99.163-9_mipsel.ipk ...
Connecting to ipkg.nslu2-linux.org[]:80
ipkg-opt_0.99.163-9_ 100% |***********************************************| 75896 00:00:00 ETA
Downloading http://ipkg.nslu2-linux.org/feeds/optware/ddwrt/cross/stable/Packages.gz
Inflating http://ipkg.nslu2-linux.org/feeds/optware/ddwrt/cross/stable/Packages.gz
Updated list of available packages in /opt/lib/ipkg/lists/optware
Successfully terminated.
Installing uclibc-opt (0.9.28-12) to /opt/...
Downloading http://ipkg.nslu2-linux.org/feeds/optware/ddwrt/cross/stable/uclibc-opt_0.9.28-12_mipsel.ipk
package uclibc-opt suggests installing ipkg-opt
Configuring uclibc-opt
Updating /opt/etc/ld.so.cache
Successfully terminated.
Installing ipkg-opt (0.99.163-9) to /opt/...
Downloading http://ipkg.nslu2-linux.org/feeds/optware/ddwrt/cross/stable/ipkg-opt_0.99.163-9_mipsel.ipk
Configuring ipkg-opt
Successfully terminated.

Step 4.3 (create a startup script that loads the modules):

This step is not necessarily if you don't want to share a printer and/or usb storage drive from router.

Now we have installed the modules but we want them to load when the router starts. Also we are going to mount the partitions and load any optware application from the /opt folder.

Originally created for the Linksys NSLU2 Unslung firmware, Optware is the name of the additional software packages available.

Start a telnet session. We are going to use "vi" text editor. A few vi commands that we are going to use are:

  • press "i" once to enter the edit mode.
  • press "esc" once to exit de edit mode.
  • press "d" + "d" while not in edit mode to delete a line.
  • type ":wq" while not in edit mode to exit and save.
For additional commands see http://www.cs.colostate.edu/helpdocs/vi.html.

First create a folder named "config" in /jffs/etc with the command "mkdir /jffs/etc/config".

Now in this folder we are going to place our startup script (named "usb.startup"). Let's create a new file with vi: "vi /jffs/etc/config/usb.startup". Please note that anything that is after a "#" until the end of the line is comment and will be ignored; you can also not write that lines. Press "i" to enter the edit mode and type the following:

export PATH=/bin:/usr/bin:/sbin:/usr/sbin
export LD_LIBRARY_PATH=/lib:/usr/lib
echo "Inserting modules for USB disk support..."
insmod /jffs/lib/modules/2.4.30/usbcore.o
insmod /jffs/lib/modules/2.4.30/ehci-hcd.o
insmod /jffs/lib/modules/2.4.30/scsi_mod.o
insmod /jffs/lib/modules/2.4.30/usb-storage.o
insmod /jffs/lib/modules/2.4.30/sd_mod.o
insmod /jffs/lib/modules/2.4.30/jbd.o
#Change the following line is using another filesystem or remove it if you don't have external drive
insmod /jffs/lib/modules/2.4.30/ext3.o
echo "Waiting for modules to initialize disk access..."
sleep 20
export LD_LIBRARY_PATH=/jffs/lib:/jffs/usr/lib
export PATH=/jffs/bin:/jffs/sbin:/jffs/usr/sbin:/jffs/usr/bin:/bin:/sbin
echo "Mountint disk partitions..."
export LD_LIBRARY_PATH=/lib:/usr/lib
mount -t ext3 -o noatime /dev/discs/disc0/part1 /opt
mount -t ext3 -o noatime /dev/discs/disc0/part2 /mmc
# provide Optware search paths
export PATH=/opt/bin:/opt/sbin:/bin:/sbin:/usr/sbin:/usr/bin
echo "Starting Optware programs..."
if [ -d /opt/etc/init.d ]; then
for f in /opt/etc/init.d/S* ; do
[ -x $f ] && $f start
) > /tmp/optware.log 2>&1

Press "esc" and type ":wq" to save and exit.

The result of the script can be seen, after reboot in "/tmp/optware.log". Just open this file with vi.

Just making this file will not load it at startup. We need to mark it as executable: "chmod +x /jffs/etc/config/usb.startup".

After making this, go to the web interface in Administration -> Commands and type:

for I in `/bin/ls /jffs/etc/config/*.startup`
sh $I &

Choose "Save startup". Now the router will load any file ending with ".startup" from /jffs/etc/config.

Step 5 (almost done - installing Samba):

Samba is an application that will allow you to share the USB drive connected to the router as a network drive. (cool, huh? :) )

Reboot your router and then after this start a telnet session. Type the following commands, one at a time:

/opt/bin/ipkg update
/opt/bin/ipkg install samba2
/opt/bin/ipkg install xinetd
/opt/etc/init.d/S10xinetd start
/opt/etc/init.d/S80samba start


Step 6 (configure Samba):

Samba's default port is 901 so type in a browser "http://your.router.ip:901" (default is") and the credentials are "root" for user, whether you changed it or not, and the password is the one you provided in ddwrt web interface (default is "admin").


In the globals tab choose "root" for the guest account and press "Commit changes". Not doing this will not allow you to write to the network drive.

Now make folders and share them :)


Step 7 (troubleshooting):

If you have any problems please feel free to contact me or write on ddwrt forum. Some more detailed guides and advanced topics can be found here.

DD-WRT Installation on other devices

DD-WRT USB Storage Guide

Optware Installation Guide