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 the current encryption standard for wireless networks. 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 driver needs at least version 1.1 of the following firmware file, which is loaded when an interface is attached:

A prepackaged version of the firmware can be installed using fw_update(1).

HARDWARE

The following adapters should work:

EXAMPLES

The following example scans for available networks:

The following hostname.if(5) example configures rsu0 to join network “mynwid”, using WPA key “mywpakey”, obtaining an IP address using DHCP:

nwid mynwid wpakey mywpakey
dhcp

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 <damien.bergamini@free.fr>.

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.

This driver does not support powersave mode.