Difference between revisions of "Set up a hotspot with Linux"

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This is an example how to turn your computer into an accesspoint for wireless networks. It is based on SUSE Linux 11.4 but should work same or similar for every distribution. We will use the software HostAPD for this.
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Superb information here, ol'e chap; keep brnuing the midnight oil.
 
 
= what you need =
 
* a Linux kernel, greater than about 2.6.30
 
* a Linux computer that has a [[bridge]] br0 as networking device
 
* a USB wireless adapter, in this example we use a Conceptronic device with a RaLink chipset
 
 
 
= what you do =
 
 
 
== create connectivity ==
 
* plug in your USB wireless network adapter
 
 
 
* find out how to activate the driver:
 
linux-noqb:~ # hwinfo --usb
 
[...]
 
22: USB 00.0: 0000 Unclassified device
 
  [Created at usb.122]
 
  Unique ID: doL0.gHs6xlT8BAF
 
  Parent ID: FKGF.0j9+vWlqL56
 
  SysFS ID: /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.6/2-1.6:1.0
 
  SysFS BusID: 2-1.6:1.0
 
  Hardware Class: unknown
 
  Model: "Ralink 802.11 bg WLAN"
 
  Hotplug: USB
 
  Vendor: usb 0x14b2 "Ralink"
 
  Device: usb 0x3c22 "802.11 bg WLAN"
 
  Revision: "0.01"
 
  Driver: "rt73usb"
 
  Driver Modules: "rt73usb"
 
  Device File: wlan1
 
  Speed: 480 Mbps
 
  HW Address: 00:80:5a:4e:1a:eb
 
  Link detected: yes
 
  Module Alias: "usb:v14B2p3C22d0001dc00dsc00dp00icFFiscFFipFF"
 
  Driver Info #0:
 
    Driver Status: rt73usb is active
 
    '''Driver Activation Cmd: "modprobe rt73usb"'''
 
  Config Status: cfg=new, avail=yes, need=no, active=unknown
 
  Attached to: #12 (Hub)
 
 
 
* Activate the driver
 
modprobe rt73usb
 
 
 
* Activate the NIC
 
ifup wlan0
 
 
 
* Install HostAPD
 
yast -i HostAPD
 
 
 
* Do the following settings in /etc/hostapd.conf
 
driver=nl80211
 
bridge=br0
 
channel=3
 
hw_mode=g
 
auth_algs=1
 
; Note: channel=3 and hw_mode=g will work on almost all modern wireless USB adapters, however it may be possible to find one that does not work.
 
 
 
* Start hostapd
 
hostapd /etc/hostapd.conf
 
 
 
* verify that you see a wireless LAN with the ESSID '''test''', e.g. on your mobile phone
 
 
 
* [[set up a dhcp server]] listening on your network bridge br0. As name server, use 8.8.8.8 which is google's name server in the internet
 
 
 
* verify you can connect to the LAN '''test''' and get an IP address
 
 
 
== Set up NAT ==
 
* [http://www.nerdgrind.com/set-up-nat-with-linux-and-iptables-firewall/ set up NAT]
 
 
 
= See also =
 
* [http://www.nerdgrind.com/set-up-nat-with-linux-and-iptables-firewall/ how to set up NAT]
 

Revision as of 05:00, 28 September 2011

Superb information here, ol'e chap; keep brnuing the midnight oil.