In this chapter 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. Can Firewalk be modified to work against an application proxy?
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 this chapter will fail.
a. Why does Firewalk fail in this case?
b. Does this proposed solution create any problems?
c. Could Firewalk be modified to work against such a firewall?
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