Ralink Technology/MediaTek USB IEEE 802.11a/b/g wireless network
driver supports USB 2.0 and PCI Express Mini
Card wireless adapters based on the Ralink RT2501USB and RT2601USB chipsets.
Ralink PCI Express Mini Card adapters show up as normal USB 2.0
devices and are thus handled by the
The RT2501USB chipset is the second generation of 802.11a/b/g
adapters from Ralink. It consists of two integrated chips, an RT2571W
MAC/BBP and an RT2528 or RT5226 radio transceiver.
The RT2601USB chipset consists of two integrated chips, an RT2671
MAC/BBP and an RT2527 or RT5225 radio transceiver. This chipset uses the
MIMO (multiple-input multiple-output) technology with multiple antennas to
extend the operating range of the adapter and to achieve higher
These are the modes the
rum driver can
- BSS mode
- Also known as infrastructure mode, this is used when
associating with an access point, through which all traffic passes. This
mode is the default.
- IBSS mode
- Also known as IEEE ad-hoc mode or
peer-to-peer mode. This is the standardized method of
operating without an access point. Stations associate with a service set.
However, actual connections between stations are peer-to-peer.
- Host AP
- In this mode the driver acts as an access point (base station) for other
- monitor mode
- In this mode the driver is able to receive packets without associating
with an access point. This disables the internal receive filter and
enables the card to capture packets from networks which it wouldn't
normally have access to, or to scan for access points.
rum driver can be configured to use
Wired Equivalent Privacy (WEP) or Wi-Fi Protected Access (WPA-PSK and
WPA2-PSK). WPA is the current encryption standard for wireless networks. It
is strongly recommended that WEP not be used as the sole mechanism to secure
wireless communication, due to serious weaknesses in it. The
rum driver relies on the software 802.11 stack for
both encryption and decryption of data frames.
The following firmware file is loaded when an interface is brought up:
The following adapters should work:
rum driver can be configured at
runtime with ifconfig(8) or on boot
The following example scans for available networks:
- 3Com Aolynk WUB320g
- Abocom WUG2700
- Airlink101 AWLL5025
- ASUS WL-167g ver 2
- Atlantis Land A02-UP1-W54
- Belkin F5D7050 ver 3
- Belkin F5D9050 ver 3
- Belkin F5D9050C
- Buffalo WLI-U2-SG54HG
- Buffalo WLI-U2-SG54HP
- Buffalo WLI-U2-G54HP
- CNet CWD-854 ver F
- Conceptronic C54RU ver 2
- Corega CG-WLUSB2GL
- Corega CG-WLUSB2GO
- Corega CG-WLUSB2GPX
- D-Link DWA-110
- D-Link DWA-111
- D-Link DWL-G122 rev C1
- D-Link WUA-1340
- Digitus DN-7003GR
- Edimax EW-7318Ug
- Edimax EW-7318USg
- Edimax EW-7618Ug
- Gigabyte GN-WB01GS
- Gigabyte GN-WI05GS
- Hawking HWUG1
- Hawking HWU54DM
- Hercules HWGUSB2-54-LB
- Hercules HWGUSB2-54V2-AP
- LevelOne WNC-0301USB v3
- Linksys WUSB200
- Linksys WUSB54G rev C
- Linksys WUSB54GR
- Planex GW-US54HP
- Planex GW-US54Mini2
- Planex GW-USMM
- Senao NUB-3701
- Sitecom WL-113 ver 2
- Sitecom WL-172
- Sweex LW053
- TP-LINK TL-WN321G
# ifconfig rum0 scan
hostname.if(5) example configures
rum0 to join network “mynwid”, using WPA key
“mywpakey”, obtaining an IP address using DHCP:
nwid mynwid wpakey mywpakey
hostname.if(5) example creates a
host-based access point on boot:
nwid mynwid wpakey mywpakey
inet 192.168.1.1 255.255.255.0
- rum0: error N, could not read firmware ...
- For some reason, the driver was unable to read the microcode file from the
filesystem. The file might be missing or corrupted.
- rum0: could not load 8051 microcode
- An error occurred while attempting to upload the microcode to the onboard
8051 microcontroller unit.
- rum0: device timeout
- A frame dispatched to the hardware for transmission did not complete in
time. The driver will reset the hardware. This should not happen.
rum driver first appeared in
rum driver supports automatic control of the
transmit speed in BSS mode only. Therefore the use of a
rum adapter in Host AP mode is discouraged.
This driver does not support powersave mode.