Added a2server_wifi.md

docs/ivanx/a2server_wifi.md

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+## A2SERVER
+
+While wired Ethernet is recommended, it\'s possible to use A2SERVER with Wi-Fi
+if you have an Apple AirPort or Time Capsule. (A2SERVER won\'t work with most
+non-Apple router and access point models, as they are not designed to handle
+AppleTalk networking.)
+
+To connect your Apple II via Wi-Fi, read how to [attach your Apple II to your
+local network](a2server_lan.md).
+
+If you want your A2SERVER machine (whether virtual, real, or Raspberry Pi) to
+connect to your network via Wi-Fi, you first need to configure a Wi-Fi network
+adapter via the instructions below. Once you\'ve got that up and running, [log
+in](a2server_commands.md) to A2SERVER and type `netatalk-wifi` to tell
+A2SERVER to use the Wi-Fi interface (if you get \"command not found\", type
+`a2server-setup` to refresh the command list).
+
+
+Setting up Wi-Fi on your A2SERVER machine:
+
+_Multiple AirPorts_
+As an alternative to using a Wi-Fi network adapter, any of the machine types
+below can work with Wi-Fi simply by connecting the wired Ethernet interface to
+another AirPort and setting up an [extended network][1] (if all AirPorts are
+802.11n models), or a [WDS][2] (if any AirPort is an 802.11g model).
+
+
+_Raspberry Pi_
+[We got a whole page about that.][3]
+
+
+_Virtual machine_
+On a virtual machine, A2SERVER won\'t work over Wi-Fi with the virtual network
+interface, but you may, or may not, be able to use a USB Wi-Fi adapter
+attached your VM\'s emulated USB port, and then follow the instructions below
+for a real machine. Some adapters may have issues with specific virtual
+machine software; for example, Atheros 9K based adapters [do not work with
+VirtualBox][4] or VMWare Fusion, though they do work with Parallels Desktop;
+Realtek 81xx based adapters seem to work with VirtualBox (at minimum).
+
+
+_Real machine (Intel or compatible)_
+On a standard computer with a native Linux installation, if you can get a
+Wi-Fi adapter working, it will probably work with A2SERVER. Instructions will
+vary by distribution, but should be similar to [the guide for Raspberry
+Pi][3], with a much wider range of usable adapters.
+
+If those steps don\'t work, type `sudo nano /etc/network/interfaces`, and edit
+the file so it contains a sequence of lines that look like this:
+`allow-hotplug wlan0 iface wlan0 inet dhcp wpa-ssid MyNetworkName` (substitute
+your Wi-Fi network name) `wpa-psk abcdefgh` (substitute your WPA password, or
+its 64-character hex equivalent)
+
+If you are using WEP encryption instead of WPA, replace the last two lines
+with: 
+`wireless-essid MyNetworkName` (substitute your Wi-Fi network name) 
+`wireless-key abcde` (substitute your 5 or 13 character, or 10 or 26 hex byte, 
+WEP password)
+
+Spaces in the Wi-Fi network name or password may not work.
+
+Remove any other chunks which mention wlan0, and save the file (press
+control-w). Then type: `sudo ifdown wlan0; sudo ifup wlan0`
+
+Finally, type `ip addr`. If you see an IP address for wlan0 (next to
+\"inet\"), your Wi-Fi adapter is on your network, and you can disconnect your
+Ethernet or serial cable. (If you don\'t seem to have internet access, type
+`sudo shutdown -r now` to restart.)
+
+
+[1]: http://support.apple.com/kb/HT4259
+[2]: http://support.apple.com/kb/HT4262
+[3]: http://ivanx.com/raspberrypi/raspberrypi_wifi.html
+[4]: https://www.virtualbox.org/ticket/9511