Some "just work", others have to be configured. Go to the penguin icon on the taskbar, then choose network/Internet > network card configuration. Enter the proper settings for your network.
Good luck. ;-)

Well apparently my network card isn't functional enough under Knoppix to configure it. The configuration tool asks me whether or not I want it to obtain an IP address automatically. I say yes, since my router is running a DHCP server (and it's working, otherwise I would not be able to post this) and the tool tries to obtain it. It fails, however.

Let's see the ifconfig output. Good luck. ;-)

I removed my MAC address. I'm not really sure, but I thought that was information best not posted onto the internet.

Let's try unloading and reloading the module.Good luck. ;-)

I guess you've hit something. All these commands seem to fail, as you can see. Or perhaps the third one did not fail, but it didn't give any output.

Try the commands from a root console or with sudo.
Good luck. ;-)

I'm not sure what you mean by a root console. I cannot choose a username to login with. That's why I kind of assumed that the user account you get in Knoppix had root privileges.

I executed the commands with sudo, but this time they returned nothing at all. Is that normal? I think I may be misunderstanding the use of the sudo command. I just typed sudo in front of all the commands,

and such. I understand that you can also use sudo to login as another user, is that what I should have done? If so, I'm not sure as what user I should login or with what password.

If you hadn't gathered yet, it didn't work. Also, I checked the output of

after executing the first command. I'm not sure my thought is correct, but I would expect something to change in that output when you take down a network device. So, just in case it helps, I'll let you know that nothing had changed.

If the command executed with no additional output that means it executed successfully. IIRC Knoppix has a root console tool available from the menu but, sudo should work as well.
Good luck. ;-)

I executed the commands with sudo, but the network card configuration tool still fails when it tries to send a DHCP broadcast.

From the Windows side do this. Go to Device manager and select the network adapter, right click on properties, then click on the advance tab > "enable lan on shutdown", also look at the power management tab, deselect "allow the computer to turn off this device to save power" option.
Good luck. ;-)

You mean Wake-On-Lan After Shutdown, right? I had tried it before, but not with the additional steps. I enabled it (the Allow computer.. was already disabled), then I tried the configuration tool again, to no avail. I also ran those commands again, then the configuration tool again, but nothing.

Have you taken a look at the bios for wake on lan or power saving feature? Try a cold boot. Shutdown the machine completely, then boot to the knoppix disk. If that doesn't work, you may need a newer kernel version, i.e. a newer Knoppix or other live disk. Knoppix 5.1.1 is 17 months old now and I'm certain there are tons of new developments in that time span.
Good luck. ;-)

Yes, wake on lan is enabled in the BIOS. The cold boot didn't have any effect.

I hadn't noticed that my version of Knoppix was old, I had only looked under the CD versions, while the new versions are only published on DVD. I downloaded the latest version, but it doesn't work. It might just be a bad burn, I'm not sure, but after it shows in verbose mode what it's starting up, just as it loads the graphical interface, the screen goes black and stays that way.

If you have any thoughts on it, I'll be happy to hear them, but to tell you the truth, this issue doesn't matter very much to me any more. I've finally managed to accomplish what I wanted to use Knoppix for in the first place, which is to resize a partition so that I could install a Linux distribution. All the problems that arose, such as the problem with my NIC and its drivers, are all nasty byproducts of my attempt at that.

I have now got it to work and I have installed Mandriva. I am having some problems with Mandriva (which I'm sure I'll start another thread about), but I am happy to conclude one thing, which is that my connection is fully functional (I am posting this from my new installation). It also hasn't caused any problems with my NIC in Windows yet.

That's good to hear, glad you got it sorted. The GUI problem may need one of the "fb" cheat codes. You can view them before you boot by pressing F2 or F3, if you decide to look into it. In any event, glad things are working for you. See you in the forums.
Good luck. ;-)