Which extension i need to configure my wireless network?
At example,puppy linux has a network wizard.
I can also put this extension in the iso of tinycore.
See the wiki for general instructions. If your wifi card / chipset is supported then it's simple, if not then you will have to find a linux driver and in some cases firmware. In some cases the driver will have to be compiled from the source using tc tools. Not all wifi hardware is supported so it's best to post your setup to get more specific help.
If a linux driver is not available then you would have to try to use the "ndiswrapper.tcz" technique which enables use of "windows xp" wifi drivers. This is not covered in the wiki last I looked. However, the extension info explains how to set up this type of operation. But be aware this too may fail depending on the wifi chipset.
See the
http://linuxwireless.org/ site for information about linux wireless support.
Also the backtrack linux distribution forum has extensive info on linux wireless,
http://www.backtrack-linux.org/forums/hardware-compatibility-list/. But be aware they use a different kernel.