docs/wireless.tex

   1 The WiFi settings are configured in the file \texttt{/etc/config/wireless}
   2 (currently supported on Broadcom and Atheros). When booting the router for the first time
   3 it should detect your card and create a sample configuration file. By default '\texttt{option network  lan}' is
   4 commented. This prevents unsecured sharing of the network over the wireless interface.
   5
   6 \paragraph{Generic Broadcom wireless config:}
   7
   8 \begin{Verbatim}
   9 config wifi-device      "wl0"
  10     option type         "broadcom"
  11     option channel      "5"
  12
  13 config wifi-iface
  14     option device       "wl0"
  15 #   option network  lan
  16     option mode         "ap"
  17     option ssid         "OpenWrt"
  18     option hidden       "0"
  19     option encryption   "none"
  20 \end{Verbatim}
  21
  22 \paragraph{Generic Atheros wireless config:}
  23
  24 \begin{Verbatim}
  25 config wifi-device      "wifi0"
  26     option type         "atheros"
  27     option channel      "5"
  28     option mode         "11g"
  29
  30 config wifi-iface
  31     option device       "wifi0"
  32 #   option network  lan
  33     option mode         "ap"
  34     option ssid         "OpenWrt"
  35     option hidden       "0"
  36     option encryption   "none"
  37 \end{Verbatim}
  38
  39 \paragraph{Generic multi-radio Atheros wireless conifg:}
  40
  41 \begin{Verbatim}
  42 config wifi-device  wifi0
  43     option type     atheros
  44     option channel  1
  45
  46 config wifi-iface
  47     option device   wifi0
  48 #   option network  lan
  49     option mode     ap
  50     option ssid     OpenWrt_private
  51     option hidden   0
  52     option encryption none
  53
  54 config wifi-device  wifi1
  55     option type     atheros
  56     option channel  11
  57
  58 config wifi-iface
  59     option device   wifi1
  60 #   option network  lan
  61     option mode     ap
  62     option ssid     OpenWrt_public
  63     option hidden   1
  64     option encryption none
  65 \end{Verbatim}
  66
  67 There are two types of config sections in this file. The '\texttt{wifi-device}' refers to
  68 the physical wifi interface and '\texttt{wifi-iface}' configures a virtual interface on top
  69 of that (if supported by the driver).
  70
  71 A full outline of the wireless configuration file with description of each field:
  72
  73 \begin{Verbatim}
  74 config wifi-device     wifi device name
  75     option type     broadcom, atheros
  76     option country  us, uk, fr, de, etc.
  77     option channel  1-14
  78     option maxassoc 1-128 (broadcom only)
  79     option distance 1-n
  80     option mode     11b, 11g, 11a, 11bg (atheros only)
  81
  82 config wifi-iface
  83     option network  the interface you want wifi to bridge with
  84     option device   wifi0, wifi1, wifi2, wifiN
  85     option mode     ap, sta, adhoc, or wds
  86     option ssid     ssid name
  87     option bssid    bssid address
  88     option encryption none, wep, psk, psk2, wpa, wpa2
  89     option key      encryption key
  90     option key1     key 1
  91     option key2     key 2
  92     option key3     key 3
  93     option key4     key 4
  94     option server   ip address
  95     option port     port
  96     option hidden   0,1
  97     option isolate  0,1
  98 \end{Verbatim}
  99
 100 \paragraph{Options for the \texttt{wifi-device}:}
 101
 102 \begin{itemize}
 103     \item \texttt{type} \\
 104         The driver to use for this interface.
 105
 106     \item \texttt{country} \\
 107         The country code used to determine the regulatory settings.
 108
 109     \item \texttt{channel} \\
 110         The wifi channel (e.g. 1-14, depending on your country setting).
 111
 112     \item \texttt{maxassoc} \\
 113         Optional: Maximum number of associated clients. This feature is supported only on the broadcom chipset.
 114
 115     \item \texttt{distance} \\
 116         Optional: Distance between the ap and the furthest client in meters. This feature is supported only on the atheros chipset.
 117
 118         \item \texttt{mode} \\
 119                 The frequency band (\texttt{b}, \texttt{g}, \texttt{bg}, \texttt{a}). This feature is only supported on the atheros chipset.
 120
 121
 122 \end{itemize}
 123
 124 \paragraph{Options for the \texttt{wifi-iface}:}
 125
 126 \begin{itemize}
 127     \item \texttt{network} \\
 128         Selects the interface section from \texttt{/etc/config/network} to be
 129         used with this interface
 130
 131     \item \texttt{device} \\
 132         Set the wifi device name.
 133
 134     \item \texttt{mode} \\
 135         Operating mode:
 136
 137         \begin{itemize}
 138             \item \texttt{ap} \\
 139                 Access point mode
 140
 141             \item \texttt{sta} \\
 142                 Client mode
 143
 144             \item \texttt{adhoc} \\
 145                 Ad-Hoc mode
 146
 147             \item \texttt{wds} \\
 148                 WDS point-to-point link
 149
 150         \end{itemize}
 151
 152     \item \texttt{ssid}
 153         Set the SSID to be used on the wifi device.
 154
 155     \item \texttt{bssid}
 156         Set the BSSID address to be used for wds to set the mac address of the other wds unit.
 157
 158     \item \texttt{encryption} \\
 159         Encryption setting. Accepts the following values:
 160
 161         \begin{itemize}
 162             \item \texttt{none}
 163             \item \texttt{wep}
 164             \item \texttt{psk}, \texttt{psk2} \\
 165                 WPA(2) Pre-shared Key
 166
 167             \item \texttt{wpa}, \texttt{wpa2} \\
 168                 WPA(2) RADIUS
 169         \end{itemize}
 170
 171     \item \texttt{key, key1, key2, key3, key4} (wep, wpa and psk) \\
 172         WEP key, WPA key (PSK mode) or the RADIUS shared secret (WPA RADIUS mode)
 173
 174     \item \texttt{server} (wpa) \\
 175         The RADIUS server ip address
 176
 177     \item \texttt{port} (wpa) \\
 178         The RADIUS server port
 179
 180     \item \texttt{hidden} \\
 181         0 broadcasts the ssid; 1 disables broadcasting of the ssid
 182
 183     \item \texttt{isolate} \\
 184         Optional: Isolation is a mode usually set on hotspots that limits the clients to communicate only with the AP and not with other wireless clients.
 185         0 disables ap isolation (default); 1 enables ap isolation.
 186
 187 \end{itemize}
 188
 189
 190 \paragraph{Limitations:}
 191
 192 There are certain limitations when combining modes.
 193 Only the following mode combinations are supported:
 194
 195 \begin{itemize}
 196     \item \textbf{Broadcom}: \\
 197         \begin{itemize}
 198             \item 1x \texttt{sta}, 0-3x \texttt{ap}
 199             \item 1-4x \texttt{ap}
 200             \item 1x \texttt{adhoc}
 201         \end{itemize}
 202
 203         WDS links can only be used in pure AP mode and cannot use WEP (except when sharing the
 204         settings with the master interface, which is done automatically).
 205
 206     \item \textbf{Atheros}: \\
 207         \begin{itemize}
 208             \item 1x \texttt{sta}, 0-4x \texttt{ap}
 209             \item 1-4x \texttt{ap}
 210             \item 1x \texttt{adhoc}
 211         \end{itemize}
 212 \end{itemize}