The Linksys WRT54G is one of the best router you may find. Why? Because you can install OpenWrt on it . Here is how to install OpenWrt White Russian RC4 in a few steps on a WRT54Gv2.
Prior to firmware upgrade
The WRT firmware can be updated using a TFTP transfer at the very beggining of the router startup sequence. This is a very short time interval so we will first exend it by changing the "boot_wait" variable stored in the router nvram memory.To do so, we will use a little hack in the web admin interface.
First, open a session into the admin interface:
http://192.168.1.1 (login: admin, password: admin)
First lets give the router a fixed IP address. Open the menu "Setup -> Basic setup" and set these values:
Internet IP address 10.0.0.1
Subnet mask 255.0.0.0
Then open the ping tool from "Administration -> Diagnostics -> Ping" and type these 4 commands:
The last command should produce some verbose output. Make sure it contains a line "boot_wait=on".
Get the latest version of the OpenWrt firmware.
~$ wget http://downloads.openwrt.org/whiterussian/newest/default/openwrt-wrt54g-squashfs.bin
Then install tftp to transfer the firmware to the router.
~$ apt-get install tftp
Now let's prepare the tftp connexion.
~$ tftp 192.168.1.1
tftp> rexmt 1
tftp> timeout 60
Packet tracing on.
Make sure the network interface you're using on your host has a fixed IP and reboot the router. Just after than, fire the command:
tftp> put openwrt-wrt54g-squashfs.bin
sent DATA <block=3019, 0 bytes>
received ACK <block=3019>
Sent 1545216 bytes in 5.6 seconds
Once the transfer is complete, you have to wait for the router to reboot. If it doesn't reboot, wait for at least 5 minues prior to do a manual reboot.
A freshly installed OpenWrt is only available throught a telnet connexion:
~$ telnet 192.168.1.1
Connected to 192.168.1.1.
Escape character is '^]'.
=== IMPORTANT ============================
Use 'passwd' to set your login password
this will disable telnet and enable SSH
BusyBox v1.00 (2005.11.23-21:46+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.
As said in the disclaimer, let's set a password for root.
Changing password for root
Enter the new password (minimum of 5, maximum of 8 characters)
Please use a combination of upper and lower case letters and numbers.
Enter new password:
Re-enter new password:
Once password is changed, we can close the telnet session. OpenWrt is now installed and ready to use over ssh. Enjoy !