An attacker uses a traceroute utility to map out the route which data
						flows through the network in route to a target destination. Tracerouting can
						allow an attacker to construct a working topology of systems and routers by
						listing the systems through which data passes through on their way to the
						targeted machine. This attack can return varied results depending upon the
						type of traceroute that is performed. Traceroute works by sending packets to
						a target while incrementing the Time-to-Live field in the packet header. As
						the packet traverses each hop along its way to the destination, its TTL
						expires generating an ICMP diagnostic message that identifies where the
						packet expired. Traditional techniques for tracerouting involved the use of
						ICMP and UDP. As more firewalls began to filter ingress ICMP, methods of
						traceroute using TCP were developed