I found this freaking cool package yesterday called tleds which blink’s the keyboard LED’s when there’s ethernet traffic. It blinks the Num lock for traffic down, and the Scroll lock for traffic up. Anyhow, I like this thing a whole lot… but I thought… what about the resources! This package is taking a whole like .03% of my CPU at least! So I needed a hardware solution… Link.
HOW TO make an Ethernet LED