Using Airport Express connected via Ethernet to extend Airport Extreme wireless lan? I was wondering whether it's possible to use an Airport Express that is connected via Ethernet (using a powerlan/-line bridge-set inbetween) to extend an Airport Extreme network?

Basically the two places are a tad too far away from each other so connecting the Express to the Extreme via WLan hardly works reliably &amp; I thought I read somewhere that the lan connected method should work, but after going through the Airport Utility Wizard that actually seems to offer this method &amp; it restarted the Express, my Lan stops working.. for some reason.. heavy packet loss from my mac to the Extreme (via ethernet aswell) and all that... if I unplug the express from lan, it all of a sudden works again perfectly fine.

So basically the question is and if its doable, what do I have to do to make this work?
what you want to do is setup your express to be a "bridge" for your airport extreme network, you want to create a "new" wireless network (but if you use the same settings as your extreme, most macs should seamlessly work and switch as required)

make sure your airport express is configured not to do any NAT or give out IP's as that is maybe what is conflicting with your network currently, also make sure you give it an IP in the same subnet as your airport extreme and also that it does not conflict with any other machines