This seems brittle as hell, and is security-through-obscurity. It breaks when packets come out of order. It breaks when packets are dropped. It breaks when i

This seems brittle as hell, and is security-through-obscurity. It breaks when packets come out of order. It breaks when packets are dropped. It breaks when it gets carried away and shuts down all inbound traffic, effectively DDOSing yourself. It seems like you would get the same benefits by moving all major at-risk services (eg SSH) to non-standard ports, and set up exponential IP bans on attempts to communicate on any other port.