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Assume that machines A and B are on the same network 10.3.2.0/24. Machine A sends out spoofed packets, and Machine B tries to sniff on the network. When Machine A spoofs packets with a destination 1.2.3.4, Machine B can always observe the spoofed packets. However, when Machine A tries to spoof packets with a destination IP address 10.3.2.30, Machine B cannot see the spoofed packets. There is nothing wrong with the spoofing or sniffing program. Apparently, the spoofed packet has never been sent out. What could be the reason

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Answer:

Explanation:

Assuming the spoofed 1.2.3.4, it will be sent out ARP to a router that is alive and get it MAC. Then the spoofed packet will be able to be sent out. If A spoofed 10.0.2.30, because it is a local address, it will send an ARP to the machine for been able to get the MAC. But, the IP address 10.0.2.30 is not original making it to be fake, so it will not replay to A, for this reason the spoofed packet cannot be sent out.

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