RSU(4) FreeBSD Kernel Interfaces Manual RSU(4)
NAME
rsu - Realtek RTL8188SU/RTL8192SU USB IEEE 802.11b/g/n wireless network
device
SYNOPSIS
rsu* at uhub? port ?
DESCRIPTION
The rsu driver supports USB 2.0 wireless network devices based on Realtek
RTL8188SU, RTL8191SU and RTL8192SU chipsets.
The RTL8188SU is a highly integrated 802.11n adapter that combines a MAC,
a 1T1R capable baseband and an RF in a single chip. It operates in the
2GHz spectrum only.
The RTL8191SU is a highly integrated multiple-in, single-out (MISO)
802.11n adapter that combines a MAC, a 1T2R capable baseband and an RF in
a single chip. It operates in the 2GHz spectrum only.
The RTL8192SU is a highly integrated multiple-in, multiple-out (MIMO)
802.11n adapter that combines a MAC, a 2T2R capable baseband and an RF in
a single chip. It operates in the 2GHz spectrum only.
These are the modes the rsu driver can operate in:
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.
The rsu driver can be configured to use Wired Equivalent Privacy (WEP) or
Wi-Fi Protected Access (WPA1 and WPA2). WPA2 is currently the most
secure encryption standard for wireless networks supported by OpenBSD.
It is strongly recommended that neither WEP nor WPA1 are used as the sole
mechanism to secure wireless communication, due to serious weaknesses.
WPA1 is disabled by default and may be enabled using the option
"wpaprotos wpa1,wpa2". For standard WPA networks which use pre-shared
keys (PSK), keys are configured using the "wpakey" option. WPA-
Enterprise networks require use of the wpa_supplicant package.
The rsu driver can be configured at runtime with ifconfig(8) or on boot
with hostname.if(5).
FILES
The adapter needs firmware files to run, which are loaded on demand by
the driver when the device is attached:
/etc/firmware/rsu-rtl8712
HARDWARE
The following adapters should work:
ASUS USB-N10
ASUS WL-167G V3
Belkin F7D1101 v1
D-Link DWA-131 A1
Hercules HWGUn-54
Hercules HWNUm-300
Planex GW-USNano
Sitecom WL-349 v1
Sitecom WL-353
Sweex LW154
TRENDnet TEW-648UB
TRENDnet TEW-649UB
EXAMPLES
The following example scans for available networks:
# ifconfig rsu0 scan
The following hostname.if(5) example configures rsu0 to join network
"mynwid", using WPA key "mywpakey", obtaining an IP address using DHCP:
join mynwid wpakey mywpakey
inet autoconf
DIAGNOSTICS
rsu0: 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.
rsu0: 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.
SEE ALSO
arp(4), ifmedia(4), intro(4), netintro(4), usb(4), hostname.if(5),
ifconfig(8)
HISTORY
The rsu driver first appeared in OpenBSD 4.9.
AUTHORS
The rsu driver was written by Damien Bergamini
<
[email protected]>.
CAVEATS
The rsu driver does not support any of the 802.11n capabilities offered
by the adapters. Additional work is required in ieee80211(9) before
those features can be supported.
FreeBSD 14.1-RELEASE-p8 March 27, 2025 FreeBSD 14.1-RELEASE-p8