How to configure a Wi-Fi router to share your computer’s 3G data stick connection to everyone.
- Connect to the Internet on your 3G data stick.
- Plug your laptop to one of the router’s LAN ports. Wait until the router connects correctly.
- Click Start > Control Panel > View Network status and tasks > Change adapter settings
- Right click the modem (or the connection where you get Internet from) > Status > Details. Write down the “IPv4 DNS Servers” on a piece of paper. Click Close once.
- Right click the Local Area Network > Status > Details. Write down the “IPv4 Default Gateway”. Click Close > Close.
- Open the browser and type the IPv4 Default Gateway on the addressbar. Routers are all different so you need to figure out where to find and configure the following:
- Review your wireless security settings. What is your SSID? What is your security key? Write this down.
- Under WAN, choose “Static IP” instead of “PPPoE” or “Automatic – DHCP”.
- Under WAN, set the WAN IP to 192.168.137.2
- Under WAN, set the Netmask to 255.255.255.0
- Under WAN, set the Gateway to 192.168.137.1
- Under WAN, set the DNS Server(s) to the “IPv4 DNS Servers” you got from step 4.
- Click Save.
- Unplug your laptop from the router’s LAN port and plug it to the WAN port. Wait until the router connects correctly.
- Go back to the “Network connection” screen on Step 4 > Properties > Sharing >
- Check “Allow other network users to connect through this computer’s Internet connection.”
- Under Home networking connection choose “Local Area Connection”
- Click OK then OK.
- Right click the Local Area Network > Status > Details. Is the IPv4 address “192.168.137.1”? If yes, then you’re done! Tell everyone to connect to the wireless router and they will be online.
NOTE: There’s a router-less method using “ad-hoc networks”, but using a router provides more range and can handle more connected computers or wifi phones.
To put things back to before.
- Uncheck the “Allow other network users to connect through this computer’s Internet connection.” on Step 7. Click OK.
- Unplug the laptop from the router’s WAN port and plug it into one of its LAN ports.
- Open a browser and visit the “IPv4 Default Gateway” address you got from Step 5.
- Switch the WAN setting from “Fixed IP” back to “Automatic – DHCP”. Save changes.
- You’re done!
Only one more thing: Sometimes, after the configuration, it is necessary to restart your modem, computer and router. In one situation, I connected them in this way. Modem ? My Computer ? Router ? all other devices (like laptop, network printer, other computer).
Source : http://superuser.com/questions/241651/setting-up-wifi-router-as-a-switch-for-internet-connection-sharing