A Certified Ethical Hacker is attempting to gather information about a target organization's network structure through network footprinting. During the operation, they encounter ICMP blocking by the…

The Linux `traceroute` command, particularly when utilizing UDP datagrams (often the default or specified with `-U`), sends packets with increasing Time-to-Live (TTL) values to a high-numbered port on the target, allowing for path discovery even when ICMP echo requests are blocked. Intermediate routers respond with 'ICMP Time Exceeded' messages, and the destination typically sends an 'ICMP Port Unreachable' message, thereby mapping the route.

Using ICMP Traceroute would be ineffective because the question explicitly states the target system's firewall is blocking ICMP traffic, preventing this method from succeeding.

The ARIN Whois database provides static registration information about IP address ranges and organizations but does not dynamically trace the live network path taken by packets from a source to a destination.

While Path Analyzer Pro is a legitimate network analysis tool, the question emphasizes the need for an 'alternative protocol' due to ICMP blocking, and a fundamental command-line utility like `traceroute` with UDP is a direct, protocol-specific solution, whereas a generic tool might still default to ICMP or require specific configuration for alternatives.