1. Connect to the Internet. In this recipe, we are assuming that the primary wired network connection, eth0, is connected to the Internet. Change it according to your setup.
2. Using your distro's network management tool, create a new ad hoc wireless connection with the following settings:
   
   • IP address: 10.99.66.55

3. Use the following shell script to share the Internet connection:

        #!/bin/bash 
        #filename: netsharing.sh

        echo 1 > /proc/sys/net/ipv4/ip_forward 

        iptables -A FORWARD -i $1 -o $2 \
            -s 10.99.0.0/16 -m conntrack --ctstate NEW -j ACCEPT 

        iptables -A FORWARD -m conntrack --ctstate \
            ESTABLISHED,RELATED -j ACCEPT

        iptables -A POSTROUTING -t nat -j MASQUERADE

4.  Run the script:

        ./netsharing.sh eth0 wlan0 

Here eth0 is the interface that is connected to the Internet and wlan0 is the wireless interface that is supposed to share the Internet with other devices.

5. Connect your devices to the wireless network you just created with the following settings:
   • IP address: 10.99.66.56 (and so on)
   • Subnet mask: 255.255.0.0