Question about IBM ThinkPad T42 Notebook

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Unable to connect to ad-hoc network

I´ve got a T42 with an Intel PRO/wireless 2200BG network adapter. I´ve set up an ad-hoc network. When I switch on the laptop it says "wireless networks found" Using Intel to manage the wifi. Screen shows the available networks. I choose the ad-hoc one and click connect but it just says Unable to connect to XXXXX.
I know the wifi works because I was using it in the UK and connected easily to a wifi router at a friends house but since I came to Spain and started the ad-hoc system - nothing! I also know the ad-hoc system works because I had it going between the main computer and an old desktop just to prove it worked.

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Do you have a wep code set up ?

Posted on Mar 02, 2009

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T42 thinkpad wireless card sees networks but cannot obtain an ip


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You an also check in your properties and make sure it's set to automatically get the IP. If you have an IP set in there manually that could cause this.

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Tip

Set up a computer-to-computer (ad hoc) network


An ad hoc network is a temporary connection between computers and devices used for a specific purpose, such as sharing documents during a meeting or playing multiple-player computer games. You can also temporarily share an Internet connection with other people on your ad hoc network, so those people don’t have to set up their own Internet connections. Ad hoc networks can only be wireless, so you must have a wireless network adapter installed in your computer to set up or join an ad hoc network.

Click to open Connect to a Network.

Click Set up a connection or network.

Click Set up an ad hoc (computer-to-computer) network, click Next, and then follow the steps in the wizard.

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If one or more of the networked computers is joined to a domain, you need to have a user account on that computer to see and access shared items on it.

If the networked computers are not joined to a domain, but you want to require people to have a user account on your computer for access to shared items, turn on password protected sharing in Network and Sharing Center.

To turn on password protected sharing
Click to open Network and Sharing Center.

Under Sharing and Discovery, if password protected sharing is off, click the arrow button to expand the section, click Turn on password protected sharing, and then click Apply. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

An ad hoc network is automatically deleted after all users disconnect from the network or when the person who set up the network disconnects and goes out of range of the other users of the network, unless you choose to make it a permanent network when you create it.

If you share your Internet connection, Internet connection sharing (ICS) will be disabled if you disconnect from the ad hoc network, you create a new ad hoc network without disconnecting from the old ad hoc network for which you enabled ICS, or you log off and then log back on (without disconnecting from the ad hoc network).

If you set up an ad hoc network and share your Internet connection, and then someone logs on to the same computer by using Fast User Switching, the Internet connection will still be shared, even if you didn't intend to share it with that person.

I hope you all found this information useful and helpful.

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Your wireless network adapter may have been disabled in the BIOS
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To check the network adapter go to the Control Panel, Click on System, click on Hardware Tab then Device Manager. Then scroll down and click on Network adapters. If you don't see your network controller or you see a yellow ? against Other devices for the Network controller. Then either it has been disabled and/or the driver was not installed.

To get the driver for the network controller you need to dowload it from the IBM/Lenovo WEB site their support/download page from a computer that has Internet access. Make sure you select your laptop model and the driver for your Windows version.
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There is an alternate form of wireless networking refered to as ad hoc -- in this version of wireless networking every wireless adapter can "talk" to any other wireless adapter configured with the same SSID (name) and security encryption (none, WEP, WPA). This is how somewhat less impromptu wireless networks are created similar to impromptu infrared networks some of us have used. One limitation of the ad hoc networks I have seen configured to date is access to the internet. I have posted an article where a stationary PC (required to be running for any other wireless machine to access the internet) with a wireless card in ad hoc mode could act as the router for wireless network but it required a cabled connection the internet. I suppose it could be a second wireless connection on a separate channel with a second wireless adapter in an infrastructure network but why? These types of networks are only recommended in another article for a limited (small) number of machines.

Based on this are you asking to create an ad hoc network to connect 2 PC's wirelessly without a wireless router or access to the internet from the wireless network (without a dedicated machine)?

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