Minecraft – LAN with no connection to main internet

When you are in-game you can either use the /publish command or use the "Open to LAN" button in the menu

To open your current single player world for other players in your LAN, type the command /publish into the chat (note that this is still very restricted, e.g. you can't adjust the game options using the commandline) or access the Game Menu and click on the "Open to LAN" button. There you can select the gamemode for other players and whether they should be allowed to use Cheats. Both of these methods give you an IP for use, for example: "Local game hosted on hostname:12345". If you type /publish and want to change the default gamemode, type /defaultgamemode 1 for example. Note: two computers using the same Minecraft account name cannot connect with this method.

Now other players can either connect to your game using the link minecraft provided you or they can connect using the multiplayer menu with its new "Scanning for LAN-Worlds" section at the bottom.

Soruce: Multiplayer - Local area network

So to elaborate, on the Desktop Computer you would start up Minecraft, go into the world you're going to host and do what it says in the quote. the Laptops should then be able to use either the link you got or the Multiplayer Menu

Try going into

• (On Windows 7/8) Control Panel -> Network and Internet -> Network Connections
• (On Windows XP) Control Panel > Network and Internet Connections

You should see a bunch of icons for your different network connections.

1. Go into the menu at the top (if it is hidden, press the Alt key to show it). This is the menu that says File, Edit, View etc.
2. There should be an 'Advanced' dropdown. Click that, and select Advanced Settings.
3. Using the up and down buttons, move your Hamachi network connection to the top of the list.

Then try again. This can sometimes fix issues with Hamachi not working correctly.