Can webcams be turned on without the indicator light?
Aside from uvcdynctrl mentioned in other answers, it's also possible to use v4l2-ctl in Linux: v4l2-ctl --device=/dev/video0 --set-ctrl led1_mode=0
icmp smurf attack
I assume that the following is your network topology (as you mention in your comment): victim (mac A) ----- | (port A) switch+router ---- (internet)...
Only top scored, non community-wiki answers of a minimum length are eligible