Question: Firewalk, a port scanning tool, will succeed if the firewall is a packet filter or a stateful packet filter, but it will fail if the

Firewalk, a port scanning tool, will succeed if the firewall is a packet filter or a stateful packet filter, but it will fail if the firewall is an application proxy.

Why is this the case? Why does Firewalk succeed when the firewall is a packet filter or stateful packet filter, but fail when the firewall is an application proxy?

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