Create wifi hotspot on Ubuntu 12 04 12 10

Ok, its sad that Android devices dont support connection to ad-hoc wifi but there are some methods. For example, for Windows 7 there is Connectify, its true its not free, but it exist! But for Linux? Im a Linux fan, I work a lot on Linux and I want to have the posibility to connect my gadgets to a hotspot but Linux creates from default ad-hoc connections. But there is a solutions and its FREE!
All you have to do is to open terminal and enter some commands. And Ill publish the steps!

1. open terminal and type: sudo lshw | less ; find -netwok section and make sure that driver is ath5k or ath9k. If you made a hotspot with Connectify on Windows7 and it worked, you can skip this step.
2. install hostapd and dnsmasq by typing: sudo apt-get install hostapd dnsmasq
3. stop those services and prevent them from starting on system start up:
• sudo service hostapd stop
• sudo service dnsmasq stop
• sudo update-rc.d hostapd disable
• sudo update-rc.d dnsmasq disable
4. configure dnsmasq:sudo gedit /etc/dnsmasq.conf and add:
1. # Bind to only one interface
2. bind-interfaces
3. # Choose interface for binding
4. interface=wlan0
5. # Specify range of IP addresses for DHCP leasses
6. dhcp-range=192.168.150.2,192.168.150.10
5. configure hostapd:sudo gedit /etc/hostapd.conf and add:
1. # Define interface
2. interface=wlan0
3. # Select driver
4. driver=nl80211
5. # Set access point name
6. ssid=myhotspot
7. # Set access point harware mode to 802.11g
8. hw_mode=g
9. # Set WIFI channel (can be easily changed)
10. channel=6
11. # Enable WPA2 only (1 for WPA, 2 for WPA2, 3 for WPA + WPA2)
12. wpa=2
13. wpa_passphrase=mypassword
6. create a file named start.sh and add the following lines:
1. #!/bin/bash
2. # Start
3. # Configure IP address for WLAN
4. sudo ifconfig wlan0 192.168.150.1
5. # Start DHCP/DNS server
6. sudo service dnsmasq restart
7. # Enable routing
8. sudo sysctl net.ipv4.ip_forward=1
9. # Enable NAT
10. sudo iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
11. # Run access point daemon
12. sudo hostapd /etc/hostapd.conf
13. # Stop
14. # Disable NAT
15. sudo iptables -D POSTROUTING -t nat -o ppp0 -j MASQUERADE
16. # Disable routing
17. sudo sysctl net.ipv4.ip_forward=0
18. # Disable DHCP/DNS server
19. sudo service dnsmasq stop
20. sudo service hostapd stop
7. start hotspot by starting your script "start.sh"

PS: Im not the author of this tutorial but it helped me and Im sure that it works!

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