I did a search for "WG311T linux" and it brought up a link that lead back to linuxquestions.org ... Here's where that link lead to:
Try to look on the bright side; you mention that your problems can't be solved, but that's probably not the case. If you put some effort into it, you can probably overcome the challenge.
iwconfig isn't going to list anything for l0 (that's an internal interface without a hardware device). iwconfig probably isn't going to say anything else for eth* unless it's a wireless interface *and* the driver is working for the wireless device.
I'd recommend trying the following:
lspci (Is your card listed? Does it have a non-"Unknown" description?)
Is your interface driver loaded (if it's a module)? /sbin/lsmod
Check "dmesg" for any data on loading up during bootup.
I presum ethat you'll get a DHCP address from the wireless router? Try running dhclient on the correct interface (eth1, eth0?) ... what does the output say?
Check your routing table (/sbin/route). Does it have the right default gw?
Try ping to the default gw IP
Try ping to a remove server's IP (maybe DNS isn't resolving).
You might want to check some of the wireless howto documents as well. They should be able to walk you through getting your device configured. There's a lot of ground work that your post doesn't mention having been tried yet. The documents are pretty well written and should help you to define the problem better if not resolve the issue completely.