I've been running my arduino-based home automation system for the last couple of weeks perfectly well, but all of a sudden, whenever the official ethernet shield is plugged in, it effectively kills the entire LAN!
Browsers take ages to load the page, then once the page looks ok, they still think there's more to come so stay in the loading state. It spends ages resolving the host, generally.
What's weird is things like Skype are unaffected.
I've tried the simple webserver ethernet example to check it's not my code that's causing it, still with no joy.
Does anyone have any suggestions of what may be wrong?
I've had a look with WireShark and there's nothing obviously going to/from the arduino.
Thanks v much, Ed