Why does firewalk succeed when firewall is a packet filter

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Reference no: EM133955621

Assignment:

1) In this course, it's stated that 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.

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

(b) Suppose that a packet filter firewall resets the TTL field to 255 for each packet that it allows through the firewall. Then the Firewalk port scanning tool described in the lecture will fail. Why? Does this proposed solution create any problems?

Reference no: EM133955621

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