Linksys WRT54G v4

Default SSID: linksys (53 addl. devices)
Default IP address: 192.168.1.1
the IP 192.168.1.1 is used by 1326 additional devices
of which 155 are Linksys devices
Default login user: blank
Default login password: admin
blank:admin credentials used by 280 additional devices
of which 135 are Linksys devices

Default Channel(s)

Manuf/OEM/ODM

CyberTAN

3rd Party Firmware Support

Broadband-Hamnet
, DD-WRT • (List)
, Gargoyle
, OpenWrt • (List | Dev | DLs)
, Tomato • (List | DLs)
, TomatoUSB • (List | DLs)

Retail

Availability

End of Life

FCC approval date

31 May 2005

Country of manuf

China

Physical

Dimensions

7.32" x 1.89" x 6.06"

Radio 1

Chip1

Broadcom BCM5352E

Chip2

Broadcom BCM2050

Wireless interface OUI

00:14:BF

Antenna Connector Type

RP-TNC

Wireless Standard

IEEE 802.11b/g

802.11g

up to 54 Mbps

802.11b

up to 11 Mbps

WiFi Operating Frequency

2.4 GHz

Radio cor_rev

	FCC ID
Linksys WRT54G-RG	Q87-WT54GV40
Linksys WRT54G-TM	Q87-WT54GV40
Linksys WRT54GL v1.0	Q87-WT54GV40
Linksys WRT54GL v1.1	Q87-WT54GV40
Linksys WRT54GS v3	Q87-WT54GV40
Linksys WRT54GS v4	Q87-WT54GV40
Linksys WRT54GS v5.0	Q87-WT54GV40
Linksys WRT54GS v5.1	Q87-WT54GV40

	CPU1 brand	Radio1 chip1 brand	Radio1 chip2 brand
Linksys WRT54G v1.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v1.1	Broadcom	Broadcom	Broadcom
Linksys WRT54G v2.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v2.2	Broadcom	Broadcom	Broadcom
Linksys WRT54G v3.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v3.1	Broadcom	Broadcom	Broadcom
Linksys WRT54G v4	Broadcom	Broadcom	Broadcom
Linksys WRT54G v5.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v5.1	Broadcom	Broadcom	Broadcom
Linksys WRT54G v5.2	Broadcom	Broadcom	Broadcom
Linksys WRT54G v6.0	Broadcom	Broadcom	Broadcom
Linksys WRT54G v7.0	Atheros	Atheros
Linksys WRT54G v7.2	Broadcom	Broadcom
Linksys WRT54G v8.0	Broadcom	Broadcom
Linksys WRT54G v8.1	Broadcom	Broadcom
Linksys WRT54G v8.2	Broadcom	Broadcom
Linksys WRT54G-TM	Broadcom	Broadcom	Broadcom
Linksys WRT54GH	Ralink	Ralink
Linksys WRT54GP2	Marvell	Marvell	Marvell
Linksys WRT54GP2A-AT	Intel XScale	Inprocomm	RFMD

For a list of all currently documented Broadcom chipsets with specifications, see Broadcom.

For a list of all currently documented Linksys device with specifications, see Linksys.

• 54 Mbps - 2.4GHz 802.11g = G54 class

Overview

Links of Interest

Flashing

NOTE: During configuration or flashing a device, the only things that should be hooked to the device is the computer and power.

Flashing DD-WRT

WARNING: Requires K2.4 for DD-WRT, Do not flash anything else!

Linksys WRT54G v4.0 on the DD-WRT Wiki

WARNING: Only DD-WRT v23 and newer will run on this model. If you use an older version, you will need to Recover from a Bad Flash.

The stock firmware from Linksys on the WRT54G v4 won't accept a firmware image over 3MB in size (you will get the error: :"Upgrade are failed!" if you try) so you will need to flash the mini version of DD-WRT onto the router BEFORE flashing any other versions.

Read the peacock announcement found here: http://www.dd-wrt.com/phpBB2/viewtopic.php?t-51486
Do a Hard reset or 30/30/30 on the router according to note 1 of the peacock announcement (30/30/30)
Set a static IP on your computer to 192.168.1.7. Subnet mask should be 255.255.255.0.
Connect the lan cable from your computer to a LAN port of your router. Make sure your router is plugged in. Nothing should be connected to your computer or the router except the lan cable between them. Turn your firewall and any wireless computer connections OFF.
Power cycle the router (uplug the power from the router for 30 seconds and then plug it back in)
Open your browser to 192.168.1.1 by putting that in the browser address window of your browser. You should open the linksys webgui and NOT a page that says Management Mode. If you see management mode, power cycle the router again.
Leave the username blank and enter "admin" as the password
Go to administration and firmware upgrade
Navigate to the folder that you are using, and select dd-wrt.v24_mini_generic.bin
Hit upgrade
When you get a success, wait FIVE FULL minutes.
If you don't get success, repeat from steps 6 up to this one. If you still don't get success, clear your browser cache. Try using a different browser as well, to navigate to 192.168.1.1.
When you can access the dd-wrt webgui using a browser at 192.168.1.1, power cycle the router.
When you can again access the dd-wrt webgui using a browser at 192.168.1.1, do another Hard reset or 30/30/30 on the router.
At this point you can choose to put a different build on, depending on what you needs are.
Reset your computer ethernet connection to auto IP and auto DNS
Check for recommended builds here.

Flashing OpenWrt

This device is NOT RECOMMENDED for future use with OpenWrt due to low flash/ram. DO NOT BUY DEVICES WITH 4MB FLASH / 32MB RAM if you intend to flash an up-to-date and secure OpenWrt version onto it! See 4/32 warning for details.

This device does not have sufficient resources (flash and/or RAM) to provide secure and reliable operation. This means that even setting a password or changing simple network settings might not be possible any more, rendering the device effectively useless. See OpenWrt on 4/32 devices what you can do now.

OpenWrt support for this device has ended in 2022.
19.07.10 was the last official build for 4/32 devices.

Devices with Broadcom WiFi chipsets have limited OpenWrt supportability (due to limited FLOSS driver availability for Broadcom chips). Consider this when choosing a device to buy, or when deciding to flash OpenWrt on your device because it is listed as supported. See Broadcom WiFi for details.

On the OpenWrt ToH (techdata entry)
On the OpenWrt Wiki
Support started version: 0.9
Current supported version: 10.03.1

Please insert instructions here

Flashing Tomato

Please insert instructions here

Flashing Gargoyle

Install Guide

Upgrading

Updating DD-WRT

If dd-wrt is already on the router follow these instructions. If stock firmware is on the router follow the flashing instructions.

Check for recommended builds here first.
Set your computer to a static IP of 192.168.1.7. (or to whatever subnet the router is on) Disable all firewalls and security. Disable wireless on your computer and only have the router connected to the flashing computer by the ethernet cable between the two.
Hard reset or 30/30/30 (If the router supports it, if not, reset to defults in the GUI) prior to flashing. Wait. Check for password page on re-login and change password.
Flash firmware. You can use the webgui except if you have a belkin router. (For belkin use tftp.exe to flash)
Wait...at least three minutes. Lights should return to normal. See important2, below. Failing to wait is how most people brick their routers.
Do a power cycle of the router. (Unplug the cord, count to 30 and plug it back in.)
Wait for the lights to return to normal usually about 2 minutes.
Hard reset or 30/30/30 again (If the router supports it, if not, reset to defults in the GUI). Wait. Check for the password page and re-login to change the password. Then you can reconfigure your settings manually.
Once configured set your computer back to autoIP and autoDNS.

Important1: This Hard reset or 30/30/30 works fine for Asus router, but you do have to power cycle after the reset.

Important2: After you flash the firmware, and before you do the hard reset, the router will be building some nvram settings. YOU MUST WAIT FOR THIS TO FINISH PRIOR TO DOING ANYTHING WITH THE ROUTER INCLUDING A HARD RESET. Usually, you can tell when this process is completed by the WAN light coming on, but it does take several minutes. Go have a beer. There are starting to be more and more people who BRICK their routers by not waiting until the nvram is rebuilt, PRIOR to doing a hard reset. YOU NEED TO WAIT!

Reverting

Read the peacock announcement found here: http://www.dd-wrt.com/phpBB2/viewtopic.php?t-51486
Do a Hard reset or 30/30/30 on the router according to note 1 of the peacock announcement (30/30/30)
Set a static IP on your computer to 192.168.1.7. Subnet mask should be 255.255.255.0.
Connect the lan cable from your computer to a LAN port of your router. Make sure your router is plugged in. Nothing should be connected to your computer or the router except the lan cable between them. Turn your firewall and any wireless computer connections OFF.
Power cycle the router (unplug the power from the router for 30 seconds and then plug it back in)
Open your browser to 192.168.1.1 by putting that in the browser address window of your browser. You should open the linksys webgui and NOT a page that says Management Mode. If you see management mode, power cycle the router again.
Enter your username and password
Go to administration and firmware upgrade
Navigate to the folder that you are using, and select WRT54G_v4.21.1_fw.bin once you've unzipped it.
Hit upgrade
When you get a success, wait FIVE FULL minutes.
When you can again access the Linksys webgui using a browser at 192.168.1.1, do another Hard reset or 30/30/30 on the router.
Reset your computer ethernet connection to auto IP and auto DNS.

JTAG-Serial Info

JTAG

JTAG Pinouts

 nTRST   1o o2	GND
   TDI   3o o4	GND
   TDO   5o o6	GND
   TMS   7o o8	GND
   TCK   9o o10	GND
 nSRST  11o o12  N/C

Using Universal JTAG Adapter

 white    1o o2	 black
   red    3o o4	 GND
  blue    5o o6	 GND
 green    7o o8	 GND
 yelow    9o o10  GND
 orange  11o o12  N/C

DD-WRT Recovery

JTAG Recovery

/noemw /nocwd switches required

Backup CFE x2 (Compare the files, they must match exactly or there is something wrong with your JTAG setup)
Erase Wholeflash x2
Flash CFE
Unplug Power
Unplug JTAG Cable

TFTP

Set Rig ip static 192.168.1.10
Plug network cable from rig to port 1
Get TFTP ready, server ip - 192.168.1.1, Password - blank, file - dd-wrt.v24_mini_wrt54g.bin
Plug in power
As soon as windows says "connected" hit upgrade. May have to use a network hub to make sure windows is always connected.
Hard Reset 30\30\30

Serial

Serial Pinouts

 VCC  1 o o 2  VCC
 TX1  3 o o 4  TX0
 RX1  5 o o 6  RX0
 N/C  7 o o 8  N/C
 GND  9 o o 10 GND

DD-WRT Serial Recovery

Modified Redhawk0 instructions

Print out these instructions for Off-Line use
Connect PC to router with a network cable
Configure PC with a static IP of 192.168.1.10
Connect Serial cable
Start one of the programs from above
Get TFTP ready with file selected
Use dd-wrt.v24_mini_wrt54g.bin
Connect power to the router
start a rapid fire Cntl-C as you plug the router to power
type "nvram erase" w/o quotes, hit enter
type "flash -noheader : flash1.trx" w/o quotes, this starts the tftp daemon, hit enter
but have TFTP ready
Click go or start on TFTP
give it 5 minutes after it finishes
then power cycle....Hard reset or 30/30/30...then config
when it stops spitting out txt....hit the enter key...you should get a login prompt...at that point, power cycle it, hard reset...then config
you'll see it boot up

vlan Info

DD-WRT vlan Info

TechInfoDepot:DD-WRT/VLAN Support

Defaults

"/proc/switch/eth0" exists

1 2 3 4 | case labels
3 2 1 0 | nvram port numbers

nvram show
root@DD-WRT:~# nvram show \| grep vlan.ports vlan1ports=4 5 vlan0ports=3 2 1 0 5* size: 19872 bytes (12896 left) root@DD-WRT:~# nvram show \| grep port.vlans port5vlans=0 1 16 port4vlans=0 port3vlans=0 port2vlans=0 port1vlans=0 port0vlans=1 size: 19872 bytes (12896 left) root@DD-WRT:~# nvram show \| grep vlan.hwname vlan1hwname=et0 vlan0hwname=et0 size: 19872 bytes (12896 left) root@DD-WRT:~# lsmod Module Size Used by ip_nat_pptp 2560 0 (unused) ip_conntrack_pptp 3036 1 ip_nat_proto_gre 1664 0 (unused) ip_conntrack_proto_gre 2584 0 [ip_nat_pptp ip_conntrack_pptp] etherip 5104 0 (unused) switch-robo 5356 0 (unused) switch-core 6352 0 [switch-robo] root@DD-WRT:~# ls /proc/switch eth0 root@DD-WRT:~# cat /proc/switch/eth0/vlan/0/ports 0 1 2 3 5t* root@DD-WRT:~# cat /proc/switch/eth0/vlan/1/ports 4 5t root@DD-WRT:~# cat /proc/switch/eth0/vlan/2/ports 4 root@DD-WRT:~# nvram commands root@DD-WRT:~# nvram set vlan1ports="3 4 5" root@DD-WRT:~# nvram set vlan0ports="2 1 0 5" root@DD-WRT:~# nvram commit root@DD-WRT:~# reboot nvram Port 1 moved to WAN vlan root@DD-WRT:~# nvram show \| grep vlan.ports vlan0ports=2 1 0 5 vlan1ports=3 4 5 size: 19850 bytes (12918 left) root@DD-WRT:~# nvram show \| grep port.vlans port5vlans=0 1 16 port3vlans=0 port1vlans=0 size: 19850 bytes (12918 left) port4vlans=0 port2vlans=0 port0vlans=1 root@DD-WRT:~# nvram show \| grep vlan.hwname vlan1hwname=et0 size: 19850 bytes (12918 left) vlan0hwname=et0 root@DD-WRT:~# GUI Port 4 moved to WAN vlan root@DD-WRT:~# nvram show \| grep vlan.ports vlan1ports=4 5 vlan0ports=3 2 1 0 5* size: 20005 bytes (12763 left) root@DD-WRT:~# nvram show \| grep port.vlans port5vlans=0 1 16 port4vlans=1 18 19 port3vlans=0 18 19 port2vlans=0 18 19 port1vlans=0 18 19 port0vlans=1 18 19 size: 20005 bytes (12763 left) root@DD-WRT:~# nvram show \| grep vlan.hwname vlan1hwname=et0 vlan0hwname=et0 size: 20005 bytes (12763 left) root@DD-WRT:~#

nvram show

root@DD-WRT:~# nvram show | grep vlan.ports
vlan1ports=4 5
vlan0ports=3 2 1 0 5*
size: 19872 bytes (12896 left)
root@DD-WRT:~# nvram show | grep port.vlans
port5vlans=0 1 16
port4vlans=0
port3vlans=0
port2vlans=0
port1vlans=0
port0vlans=1
size: 19872 bytes (12896 left)
root@DD-WRT:~# nvram show | grep vlan.hwname
vlan1hwname=et0
vlan0hwname=et0
size: 19872 bytes (12896 left)
root@DD-WRT:~# lsmod
Module Size Used by
ip_nat_pptp 2560 0 (unused)
ip_conntrack_pptp 3036 1
ip_nat_proto_gre 1664 0 (unused)
ip_conntrack_proto_gre 2584 0 [ip_nat_pptp ip_conntrack_pptp]
etherip 5104 0 (unused)
switch-robo 5356 0 (unused)
switch-core 6352 0 [switch-robo]
root@DD-WRT:~# ls /proc/switch
eth0
root@DD-WRT:~# cat /proc/switch/eth0/vlan/0/ports
0 1 2 3 5t*
root@DD-WRT:~# cat /proc/switch/eth0/vlan/1/ports
4 5t
root@DD-WRT:~# cat /proc/switch/eth0/vlan/2/ports
4
root@DD-WRT:~#

nvram commands

root@DD-WRT:~# nvram set vlan1ports="3 4 5"
root@DD-WRT:~# nvram set vlan0ports="2 1 0 5*"
root@DD-WRT:~# nvram commit
root@DD-WRT:~# reboot

nvram

Port 1 moved to WAN vlan

root@DD-WRT:~# nvram show | grep vlan.ports
vlan0ports=2 1 0 5*
vlan1ports=3 4 5
size: 19850 bytes (12918 left)
root@DD-WRT:~# nvram show | grep port.vlans
port5vlans=0 1 16
port3vlans=0
port1vlans=0
size: 19850 bytes (12918 left)
port4vlans=0
port2vlans=0
port0vlans=1
root@DD-WRT:~# nvram show | grep vlan.hwname
vlan1hwname=et0
size: 19850 bytes (12918 left)
vlan0hwname=et0
root@DD-WRT:~#

GUI

Port 4 moved to WAN vlan

root@DD-WRT:~# nvram show | grep vlan.ports
vlan1ports=4 5
vlan0ports=3 2 1 0 5*
size: 20005 bytes (12763 left)
root@DD-WRT:~# nvram show | grep port.vlans
port5vlans=0 1 16
port4vlans=1 18 19
port3vlans=0 18 19
port2vlans=0 18 19
port1vlans=0 18 19
port0vlans=1 18 19
size: 20005 bytes (12763 left)
root@DD-WRT:~# nvram show | grep vlan.hwname
vlan1hwname=et0
vlan0hwname=et0
size: 20005 bytes (12763 left)
root@DD-WRT:~#