Edimax BR-6204Wg

Table of Contents

The random Edimax router found in the junk box will serve as a garage 802.11 AP.

1 Hardware

The router is built based on the RTL8186 SoC with 2 MB of Flash and 16 MB of RAM.

The device exposes a serial console with 3.3 V levels and 38400 8n1 setup. There are also JTAG pins exposed.

I have had this router without a case so it was not obvious at first what it was. By searching for the string '1244-00000401-01Z' silkscreened on the PCB on wikidevi I found out that it's an Edimax BR-6204Wg or identical (as documented on wikidevi the device is sold under many different brands).

2 Bootloader

The bootloader can be activated by pressing the "RESET" button and holding it while the device power is turned on. This process is described on the rtl8186 forums on sourceforge

The serial log of this is below:

UART1 output test ok
Uart init
mfid=000000c2 devid=00002249
Found 1 x 2M flash memory

---RealTek(RTL8186)at 2005.06.06-11:22+0800 version 1.3c [32bit](180MHz)

UART1 output test ok
Uart init
mfid=000000c2 devid=00002249
Found 1 x 2M flash memory

---RealTek(RTL8186)at 2005.06.06-11:22+0800 version 1.3c [32bit](180MHz)

---Escape booting by user
<RealTek>help
----------------- COMMAND MODE HELP ------------------
HELP (?)				    : Print this help message
D <Address> <Len>
EW <Address> <Value1> <Value2>...
EH <Address> <Value1> <Value2>...
EB <Address> <Value1> <Value2>...
EC <Address> <Value1> <Length>...
CMP: CMP <dst><src><length>
IPCONFIG:<TargetAddress>
J: Jump to <TargetAddress>
FLW: FLW <dst><src><length>
FLR: FLR <dst><src><length>
LOADADDR: <Load Address>
AUTOBURN: 0/1
<RealTek>

3 Original firmware

The original firmware boot serial log:

UART1 output test ok
Uart init
mfid=000000c2 devid=00002249
Found 1 x 2M flash memory

---RealTek(RTL8186)at 2005.06.06-11:22+0800 version 1.3c [32bit](180MHz)
Jump to image start=0x80800000...
early printk enabled 
Determined physical RAM map:
 memory: 01000000 @ 00000000 (usable)
Initial ramdisk at: 0x801d3000 (5242880 bytes)
On node 0 totalpages: 4096
zone(0): 4096 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: root=/dev/ram console=0 ramdisk_start=0 single
Calibrating delay loop... 179.40 BogoMIPS
Memory: 8984k/16384k available (1664k kernel code, 7400k reserved, 5248k data, 56k init, 0k highmem)
Dentry-cache hash table entries: 2048 (order: 2, 16384 bytes)
Inode-cache hash table entries: 1024 (order: 1, 8192 bytes)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 4096 (order: 2, 16384 bytes)
check_wait... unavailable.
POSIX conformance testing by UNIFIX
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
pty: 256 Unix98 ptys configured
Serial driver version 6.02 (2003-03-12) with no serial options enabled
ttyS00 at 0x00c3 (irq = 3) is a rtl_uart1
state->flags=00000000
HDLC line discipline: version $Revision: 1.1.1.1 $, maxframe=4096
N_HDLC line discipline registered.
block: 64 slots per queue, batch=16
RAMDISK driver initialized: 16 RAM disks of 6144K size 1024 blocksize
PPP generic driver version 2.4.1
Cronyx Ltd, Synchronous PPP and CISCO HDLC (c) 1994
Linux port (c) 1998 Building Number Three Ltd & Jan "Yenya" Kasprzak.
HDLC support module revision 1.02 for Linux 2.4
RealTek E-Flash System Driver. (C) 2002 RealTek Corp.
Found 1 x 2M Byte MXIC MX29LV160AB at 0xbe000000
RTL8180/RTL8185 driver version 1.8 (2005-09-23)
8186NIC Ethernet driver v0.0.2 (Jan 30, 2004)
eth0: RTL8186-NIC at 0xbd200000, 00:01:02:03:04:05, IRQ 4
eth1: RTL8186-NIC at 0xbd300000, 04:05:06:07:08:09, IRQ 5
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 1024 bind 2048)
ip_conntrack version 2.1 (128 buckets, 1024 max) - 360 bytes per conntrack
ip_tables: (C) 2000-2002 Netfilter core team
ipt_recent v0.2.3: Stephen Frost <sfrost@snowman.net>.  http://snowman.net/projects/ipt_recent/
ipt_time loading
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
NET4: Ethernet Bridge 008 for NET4.0
RAMDISK: ext2 filesystem found at block 0
RAMDISK: Loading 5120 blocks [1 disk] into ram disk... done.
Freeing initrd memory: 5120k freed
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 56k freed
mount /proc file system ok!
serial console detected.  Disabling virtual terminals.


BusyBox v1.00-pre8 (2005.07.08-09:10+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

Sat Jan  1 00:00:00 UTC 2000
create flash.inc
Initialize WLAN interface
SIOCGIFFLAGS: No such device
bridge br0 doesn't exist; can't delete it
Setup bridge...
device eth0 entered promiscuous mode
eth0:phy is 8305
SIOCDELRT: No such process
device eth1 entered promiscuous mode
eth1:phy is 8305
SIOCDELRT: No such process
device wlan0 entered promiscuous mode
SIOCDELRT: No such process
br0: port 3(wlan0) entering listening state
br0: port 2(eth1) entering listening state
br0: port 3(wlan0) entering learning state
br0: port 3(wlan0) entering forwarding state
br0: topology change detected, propagating
br0: port 1(eth0) entering listening state
br0: port 2(eth1) entering learning state
br0: port 2(eth1) entering forwarding state
br0: topology change detected, propagating
br0: port 1(eth0) entering learning state
br0: port 1(eth0) entering forwarding state
br0: topology change detected, propagating
SIOCDELRT: No such process
SIOCDELRT: No such process
Restart WLAN **********
br0: port 3(wlan0) entering disabled state
br0: port 3(wlan0) entering listening state
br0: port 3(wlan0) entering learning state
br0: port 3(wlan0) entering forwarding state
br0: topology change detected, propagating
run Diagd **********
setting: port: 31727 
running in daemon mode
run GaTest **********
/bin/init.sh: 326: /bin/agent: not found
killall: radiusd: no process killed
RADIUS server disable !!
Restart wlanapp.sh **********
Restart WLAN **********
br0: port 3(wlan0) entering disabled state
br0: port 3(wlan0) entering listening state
br0: port 3(wlan0) entering learning state
br0: port 3(wlan0) entering forwarding state
br0: topology change detected, propagating




         Please enter your Name and Password



 User Name   :











-------------------------------------------------------------------------------
<TAB> Select                     <ESC> Exit                     <Enter> Enter

There is a password prompt but it can be easily bypassed with Ctrl-C giving us a root shell:

 User Name   :
# ls -l /
drwxr-xr-x    2 root     0            2048 Nov  8  2005 bin
drwxr-xr-x    3 root     0            1024 Nov  8  2005 dev
drwxr-xr-x    6 root     0            1024 Nov  8  2005 etc
drwxr-xr-x    2 root     0            1024 Nov  8  2005 lib
lrwxrwxrwx    1 root     0              11 Nov  8  2005 linuxrc -> bin/busybox
drwx------    2 root     0           12288 Nov  8  2005 lost+found
dr-xr-xr-x   23 root     0               0 Jan  1 00:00 proc
drwxr-xr-x    2 root     0            1024 Nov  8  2005 sbin
drwxr-xr-x    3 root     0            1024 Nov  8  2005 share
drwxr-xr-x    2 root     0            1024 Nov  8  2005 tmp
drwxr-xr-x    5 root     0            1024 Nov  8  2005 usr--------------------
drwxr-xr-x    1 root     0               0 Jan  1 00:00 var     <Enter> Enter
drwxr-xr-x    2 root     0            1024 Nov  8  2005 var.radius
drwxr-xr-x    3 root     0            1024 Nov  8  2005 web
# ps -ef
  PID  Uid     VmSize Stat Command
    1 root        256 S   init        
    2 root            SW  [keventd]
    3 root            RWN [ksoftirqd_CPU0]
    4 root            SW  [kswapd]
    5 root            SW  [bdflush]
    6 root            SW  [kupdated]
    7 root            SW  [mtdblockd]
    8 root        336 S   -sh 
  320 root        192 S   /bin/diagd -d 
  382 root        340 S   webs 
  385 root        240 R   ps -ef 
# 

There are some useful commands here, one of them is 'flash' which allows to access the configuration variables, for example in the router I had:

# flash all
HW_BOARD_ID=2
HW_NIC0_ADDR=000e2e7ce223
HW_NIC1_ADDR=000e2e7ce224
HW_WLAN_ADDR=000e2e7ce223
HW_REG_DOMAIN=3
HW_RF_TYPE=7
HW_TX_POWER_CCK=0c0c0c0d0d0d0d0d0d0e0e0e0e0e
HW_TX_POWER_OFDM=17171717171717171717171717170e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e
HW_ANT_DIVERSITY=1
HW_TX_ANT=0
HW_CCA_MODE=0
HW_WLAN_LED_TYPE=2
HW_INIT_GAIN=4
DHCP_CLIENT_START='192.168.2.100'
DHCP_CLIENT_END='192.168.2.200'
LICENCE=0
RSER_ENABLED=0
RSER_CLT_TBL_NUM=0
RSER_USR_TBL_NUM=0
WLAN_TRAN_RATE='auto'
WLAN_RATE_MODE=0
WLAN_CTS=0
WLAN_BURST=0
WEP152_KEY1=00000000000000000000000000000000
WEP152_KEY2=00000000000000000000000000000000
WEP152_KEY3=00000000000000000000000000000000
WEP152_KEY4=00000000000000000000000000000000
DOT1X_MODE=0
ELAN_MAC_ADDR=000000000000
WLAN_MAC_ADDR=000000000000
SSID='INTERFERENCJA'
CHANNEL=13
WEP=2
WEP64_KEY1=0000000000
WEP64_KEY2=0000000000
WEP64_KEY3=0000000000
WEP64_KEY4=0000000000
WEP128_KEY1=686973746572657a6177656273
WEP128_KEY2=00000000000000000000000000
WEP128_KEY3=00000000000000000000000000
WEP128_KEY4=00000000000000000000000000
WEP_DEFAULT_KEY=0
WEP_KEY_TYPE=0
FRAG_THRESHOLD=2346
SUPPORTED_RATES=15
BEACON_INTERVAL=256
PREAMBLE_TYPE=0
BASIC_RATES=3
RTS_THRESHOLD=2347
AUTH_TYPE=0
HIDDEN_SSID=1
WLAN_DISABLED=0
INACTIVITY_TIME=30000
RATE_ADAPTIVE_ENABLED=1
DTIM_PERIOD=3
NETWORK_TYPE=0
IAPP_DISABLED=1
PROTECTION_DISABLED=1
MACCLONE_ENABLED=0
BAND=3
FIX_RATE=1
WPA2_PRE_AUTH=0
WPA2_CIPHER_SUITE=0
WLAN_SET_TX=0
AP_MODE=2
SECURITY_MODE=0
CLIENT_IP_DISABLED=0
WLAN_BLOCK_RELAY=0
AUTO_MAC_CLONE=0
OP_MODE=0
WISP_WAN_ID=0
STA_SSID=''
STA_SEC_MODE=0
ADHOC_SEC_MODE=0
STA_ENCRYPT=0
STA_WPA_AUTH=0
STA_AUTH_TYPE=0
STA_WPA_CIPHER_SUITE=0
STA_WEP=0
STA_WEP64_KEY1=0000000000
STA_WEP64_KEY2=0000000000
STA_WEP64_KEY3=0000000000
STA_WEP64_KEY4=0000000000
STA_WEP128_KEY1=00000000000000000000000000
STA_WEP128_KEY2=00000000000000000000000000
STA_WEP128_KEY3=00000000000000000000000000
STA_WEP128_KEY4=00000000000000000000000000
STA_WEP_DEFKEY=0
STA_WEP_KEY_TYPE=0
STA_PSK_FORMAT=0
STA_WPA_PSK=''
WLAN_BSSID=000000000000
STA_ENRADIUS=0
STA_EAP_TYPE=0
STA_ENCLT_CER=0
STA_ENSER_CER=0
CLT_CER_FILE=0
SER_CER_FILE=0
STA_ID=''
STA_PASS=''
STA_PROTOCOL=''
STA_EAP_ID=''
STA_EAP_PASS=''
STA_CLIENT_PASS=''
STA_SERVER_PASS=''
STA_RTS=0
STA_FRAGMENT=0
STA_PREAMBLE=0
WL_LINKMAC1=000000000000
WL_LINKMAC2=000000000000
WL_LINKMAC3=000000000000
WL_LINKMAC4=000000000000
WL_LINKMAC5=000000000000
WL_LINKMAC6=000000000000
WDS_ENABLED=0
WDS_ENCRYPT=0
WDS_WEP_FORMAT=0
WDS_WEP_KEY=''
WDS_PSK_FORMAT=0
WDS_PSK=''
WLAN_ENCRYPT=0
WLAN_ENABLE_SUPP_NONWPA=0
WLAN_SUPP_NONWPA=0
WLAN_WPA_AUTH=2
WLAN_WPA_CIPHER_SUITE=1
WLAN_WPA_PSK=''
WLAN_WPA_GROUP_REKEY_TIME=86400
MAC_AUTH_ENABLED=0
RS_IP='0.0.0.0'
RS_PORT=1812
RS_PASSWORD=''
RS_MAXRETRY=3
RS_INTERVAL_TIME=5
ACCOUNT_RS_ENABLED=0
ACCOUNT_RS_IP='0.0.0.0'
ACCOUNT_RS_PORT=1813
ACCOUNT_RS_PASSWORD=''
ACCOUNT_RS_UPDATE_ENABLED=0
ACCOUNT_RS_UPDATE_DELAY=60
ACCOUNT_RS_MAXRETRY=3
ACCOUNT_RS_INTERVAL_TIME=5
WLAN_ENABLE_1X=0
WLAN_PSK_FORMAT=0
IP_ADDR='192.168.9.18'
DHCPGATEWAYIP_ADDR='0.0.0.0'
DHCPNAMESERVER_ADDR='0.0.0.0'
DOMAIN_NAME=''
LAN_LEASE_TIME=946080000
SUBNET_MASK='255.255.255.0'
DEFAULT_GATEWAY='0.0.0.0'
DHCP=0
STP_ENABLED=0
WLAN_MACAC_NUM=1
WLAN_MACAC_ENABLED=1
WLAN_MACAC_ADDR1=0020a64f1641,"Baza"
SUPER_NAME='super'
SUPER_PASSWORD='APR@xuniL'
USER_NAME='admin'
USER_PASSWORD='hister'
REPEATER_ENABLED=0
REPEATER_SSID=''
PS_ENABLE=0
PS_IPPENABLE=0
PS_LPRENABLE=0
PS_NAME=''
PS_PORT1NAME=''
PS_PORT2NAME=''
# 

The configuration can be reset allowing normal AP access.

# flash reset
# flash default
# flash all
HW_BOARD_ID=2
HW_NIC0_ADDR=000e2e7ce223
HW_NIC1_ADDR=000e2e7ce224
HW_WLAN_ADDR=000e2e7ce223
HW_REG_DOMAIN=3
HW_RF_TYPE=7
HW_TX_POWER_CCK=0c0c0c0d0d0d0d0d0d0e0e0e0e0e
HW_TX_POWER_OFDM=17171717171717171717171717170e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e0e
HW_ANT_DIVERSITY=1
HW_TX_ANT=0
HW_CCA_MODE=0
HW_WLAN_LED_TYPE=2
HW_INIT_GAIN=4
DHCP_CLIENT_START='192.168.2.100'
DHCP_CLIENT_END='192.168.2.200'
LICENCE=0
RSER_ENABLED=0
RSER_CLT_TBL_NUM=0
RSER_USR_TBL_NUM=0
WLAN_TRAN_RATE='auto'
WLAN_RATE_MODE=0
WLAN_CTS=0
WLAN_BURST=0
WEP152_KEY1=00000000000000000000000000000000
WEP152_KEY2=00000000000000000000000000000000
WEP152_KEY3=00000000000000000000000000000000
WEP152_KEY4=00000000000000000000000000000000
DOT1X_MODE=0
ELAN_MAC_ADDR=000000000000
WLAN_MAC_ADDR=000000000000
SSID='default'
CHANNEL=11
WEP=0
WEP64_KEY1=0000000000
WEP64_KEY2=0000000000
WEP64_KEY3=0000000000
WEP64_KEY4=0000000000
WEP128_KEY1=00000000000000000000000000
WEP128_KEY2=00000000000000000000000000
WEP128_KEY3=00000000000000000000000000
WEP128_KEY4=00000000000000000000000000
WEP_DEFAULT_KEY=0
WEP_KEY_TYPE=1
FRAG_THRESHOLD=2346
SUPPORTED_RATES=15
BEACON_INTERVAL=100
PREAMBLE_TYPE=0
BASIC_RATES=3
RTS_THRESHOLD=2347
AUTH_TYPE=2
HIDDEN_SSID=0
WLAN_DISABLED=0
INACTIVITY_TIME=30000
RATE_ADAPTIVE_ENABLED=1
DTIM_PERIOD=3
NETWORK_TYPE=0
IAPP_DISABLED=0
PROTECTION_DISABLED=1
MACCLONE_ENABLED=0
BAND=3
FIX_RATE=0
WPA2_PRE_AUTH=0
WPA2_CIPHER_SUITE=0
WLAN_SET_TX=0
AP_MODE=0
SECURITY_MODE=0
CLIENT_IP_DISABLED=0
WLAN_BLOCK_RELAY=0
AUTO_MAC_CLONE=0
OP_MODE=0
WISP_WAN_ID=0
STA_SSID=''
STA_SEC_MODE=0
ADHOC_SEC_MODE=0
STA_ENCRYPT=0
STA_WPA_AUTH=0
STA_AUTH_TYPE=0
STA_WPA_CIPHER_SUITE=0
STA_WEP=0
STA_WEP64_KEY1=0000000000
STA_WEP64_KEY2=0000000000
STA_WEP64_KEY3=0000000000
STA_WEP64_KEY4=0000000000
STA_WEP128_KEY1=00000000000000000000000000
STA_WEP128_KEY2=00000000000000000000000000
STA_WEP128_KEY3=00000000000000000000000000
STA_WEP128_KEY4=00000000000000000000000000
STA_WEP_DEFKEY=0
STA_WEP_KEY_TYPE=0
STA_PSK_FORMAT=0
STA_WPA_PSK=''
WLAN_BSSID=000000000000
STA_ENRADIUS=0
STA_EAP_TYPE=0
STA_ENCLT_CER=0
STA_ENSER_CER=0
CLT_CER_FILE=0
SER_CER_FILE=0
STA_ID=''
STA_PASS=''
STA_PROTOCOL=''
STA_EAP_ID=''
STA_EAP_PASS=''
STA_CLIENT_PASS=''
STA_SERVER_PASS=''
STA_RTS=0
STA_FRAGMENT=0
STA_PREAMBLE=0
WL_LINKMAC1=000000000000
WL_LINKMAC2=000000000000
WL_LINKMAC3=000000000000
WL_LINKMAC4=000000000000
WL_LINKMAC5=000000000000
WL_LINKMAC6=000000000000
WDS_ENABLED=0
WDS_ENCRYPT=0
WDS_WEP_FORMAT=0
WDS_WEP_KEY=''
WDS_PSK_FORMAT=0
WDS_PSK=''
WLAN_ENCRYPT=0
WLAN_ENABLE_SUPP_NONWPA=0
WLAN_SUPP_NONWPA=0
WLAN_WPA_AUTH=2
WLAN_WPA_CIPHER_SUITE=1
WLAN_WPA_PSK=''
WLAN_WPA_GROUP_REKEY_TIME=86400
MAC_AUTH_ENABLED=0
RS_IP='0.0.0.0'
RS_PORT=1812
RS_PASSWORD=''
RS_MAXRETRY=3
RS_INTERVAL_TIME=5
ACCOUNT_RS_ENABLED=0
ACCOUNT_RS_IP='0.0.0.0'
ACCOUNT_RS_PORT=1813
ACCOUNT_RS_PASSWORD=''
ACCOUNT_RS_UPDATE_ENABLED=0
ACCOUNT_RS_UPDATE_DELAY=60
ACCOUNT_RS_MAXRETRY=3
ACCOUNT_RS_INTERVAL_TIME=5
WLAN_ENABLE_1X=0
WLAN_PSK_FORMAT=0
IP_ADDR='192.168.2.1'
DHCPGATEWAYIP_ADDR='0.0.0.0'
DHCPNAMESERVER_ADDR='0.0.0.0'
DOMAIN_NAME=''
LAN_LEASE_TIME=946080000
SUBNET_MASK='255.255.255.0'
DEFAULT_GATEWAY='0.0.0.0'
DHCP=0
STP_ENABLED=0
WLAN_MACAC_NUM=0
WLAN_MACAC_ENABLED=0
SUPER_NAME='super'
SUPER_PASSWORD='APR@xuniL'
USER_NAME='admin'
USER_PASSWORD='1234'
REPEATER_ENABLED=0
REPEATER_SSID=''
PS_ENABLE=0
PS_IPPENABLE=0
PS_LPRENABLE=0
PS_NAME=''
PS_PORT1NAME=''
PS_PORT2NAME=''
# 

4 Alternative Firmware

There are alternative firmware projects for the RTL8186-based routers. The most known one seems to be Wive-NG. I have not tried to install them however as I need only very basic AP functionality.

Created: 2020-08-30 17:30

Validate