FastNetMon is a life saver. First installed it when there was no paid / advanced version just to blackhole hosts under attack. Then negotiated with our upstream

FastNetMon is a life saver. First installed it when there was no paid / advanced version just to blackhole hosts under attack. Then negotiated with our upstream provider to have BGP Flowspec support e.g. block specific types of traffic. Back then, UDP Amplification attacks were scariest of them all and FastNetMon was able to send Flowspec announcements to our upstream to block, for instance, traffic to UDP/53 port, which kept the host alive most of the times.