Hello,
the issue probably can be caused by some hardware like Belkin but I suppose it is just minor settings mistakes. Actually, Mac's wireless connection is available with Shared networking. As for Bridged ethernet, some issues can happen but it should be managed to work as well.
from http://forum.parallels.com/showthread.php?p=103424#post103424
After reading through this long thread, I have to report that on a clean, first install of Parallels 3.0 (accepting all defaults) onto Leopard, and an equally clean first install of XP Home (accepting all defaults), and an awful lot of fiddling around, XP's internet connection wizard tells me it is connected via a LAN with an ip address but it cannot receive any data. It seems to be able to send packets but not to receive any.
In a moment of madness I tried sending myself a test email, just to see whether that level of info was getting through but no luck. I've turned my NetBarrier settings to Off but still nothing gets through. Everything is saying 'cannot connect to the internet'.
I'm obviously connected via the mac
I've tried all the network adapter settings, and though XP is claiming it is connected via the host-only option in Parallels and it is saying it is working on a LAN or High Speed internect connection it doesnt receive any incoming signals. I've also tried it with and without Windows firewall settings on but still no incoming signal.
I'm currently re-trying shared networking but no incoming signals are being reported, despite XP's network connection sending!
WHY???? What is going wrong??