Friday, January 25, 2013

Create Hotspot in ubuntu

So here's the guide how to set up infrastructure hotspot on ubuntu 12.04/12.10. Unlike some other methods described on the internet, this one will not break default network manager.

1. First of all you should make sure, that your wifi adapter supports infrastructure hotspots. If you used connectify on your windows system and it worked, skip this step.

open terminal and type: sudo lshw | less

find -network section and make sure that driver is ath5k or ath9k, this solution will only work for those drivers, but should fit the needs for the most laptop users.

2. We now need to install 2 additional tools to make out hotspot, 1st one is hostapd(hotspot server), 2nd one is dnsmasq(dns dhcp server)

in terminal type: sudo apt-get install hostapd dnsmasq

3. stop those services if started already, and prevent them from starting on system start up.

in terminal type: 
sudo service hostapd stop
sudo service dnsmasq stop
sudo update-rc.d hostapd disable
sudo update-rc.d dnsmasq disable

4. Now we need to set up config files. 
in terminal type: sudo gedit /etc/dnsmasq.conf
or sudo kate /etc/dnsmasq.conf if you use kde

add those lines to the config file 

# Bind to only one interface
# Choose interface for binding
# Specify range of IP addresses for DHCP leasses
5. hostapd config

in terminal type: sudo gedit /etc/hostapd.conf

and add those lines

# Define interface
# Select driver
# Set access point name
# Set access point harware mode to 802.11g
# Set WIFI channel (can be easily changed)
# Enable WPA2 only (1 for WPA, 2 for WPA2, 3 for WPA + WPA2)
You can change ssid name and password for anything you want here. Current config will create hotspot named myhotspot with mypassword password.

6. Now create anywhere you want a file named
edit it with any text editor like this:

# Start
# Configure IP address for WLAN
sudo ifconfig wlan0
# Start DHCP/DNS server
sudo service dnsmasq restart
# Enable routing
sudo sysctl net.ipv4.ip_forward=1
# Enable NAT
sudo iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
# Run access point daemon
sudo hostapd /etc/hostapd.conf
# Stop
# Disable NAT
sudo iptables -D POSTROUTING -t nat -o ppp0 -j MASQUERADE
# Disable routing
sudo sysctl net.ipv4.ip_forward=0
# Disable DHCP/DNS server
sudo service dnsmasq stop
sudo service hostapd stop
You will probably need to change ppp0 in this to eth0 (or any other number which refers to your wired connection.

7. Last step. Now you can start your hotspot by starting our script. just run it using sudo sh
for me it looks like this sudo sh /home/ogyct/Desktop/ because I have it on my desktop


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