rtw —
Realtek RTL8180L IEEE 802.11b wireless network
device
rtw* at cardbus?
rtw* at pci?
The
rtw driver supports PCI/CardBus 802.11b
wireless adapters based on the Realtek RTL8180L.
A variety of radio transceivers can be found in these devices, including the
Philips SA2400A, Maxim MAX2820, and GCT GRF5101.
These are the modes the
rtw 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.
-
-
- 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
cards.
-
-
- 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.
The
rtw driver can be configured to use
software Wired Equivalent Privacy (WEP). It is strongly recommended that WEP
not be used as the sole mechanism to secure wireless communication, due to
serious weaknesses in it.
The
rtw driver can be configured at runtime
with
ifconfig(8) or on boot
with
hostname.if(5).
The following adapters should work:
The following example scans for available networks:
# ifconfig rtw0 scan
The following
hostname.if(5)
example configures rtw0 to join network “mynwid”, using WEP key
“mywepkey”, obtaining an IP address using DHCP:
nwid mynwid
nwkey mywepkey
dhcp
The following
hostname.if(5)
example creates a host-based access point on boot:
mediaopt hostap
nwid mynwid
nwkey mywepkey
inet 192.168.1.1 255.255.255.0
arp(4),
cardbus(4),
ifmedia(4),
intro(4),
netintro(4),
pci(4),
hostname.if(5),
hostapd(8),
ifconfig(8)
Realtek,
http://www.realtek.com.tw.
The
rtw device driver first appeared in
OpenBSD 3.7.
The
rtw driver was written by
David Young
<
dyoung@NetBSD.org>
and ported to
OpenBSD by
Jonathan Gray
<
jsg@openbsd.org>.
GCT refuse to release any documentation on their GRF5101 RF transceiver.
While PCI devices will attach most of them are not able to transmit.
Host AP mode doesn't support power saving. Clients attempting to use power
saving mode may experience significant packet loss (disabling power saving on
the client will fix this).
![[OpenBSD]](/openbsd.gif){kind=small}