Sure. That's what they do. The problem is you have UDP packets on port 123 coming from all over the world hammering at your door. They're politely getting drop

Sure. That's what they do. The problem is you have UDP packets on port 123 coming from all over the world hammering at your door. They're politely getting dropped by firewalls, but they consume all the bandwidth in to the edge of your network, so the legitimate traffic cant get through.