Probabilistic Packet Marking is used in a network. Node B received $20$ packets with the same source IP address, which is $10\mathrm{.}3\mathrm{.}2\mathrm{.}30.$ Among them, $11$ packets have IP address $10\mathrm{.}0\mathrm{.}2\mathrm{.}24$ in the marking field, $5$ packets have IP $64\mathrm{.}3\mathrm{.}0\mathrm{.}18$ in that field, and $4$ packets have no information there. Can you tell whether they are spoofed packets? If among them, ten packets with $12\mathrm{.}0\mathrm{.}2\mathrm{.}24,$ six packets with $8\mathrm{.}9\mathrm{.}0\mathrm{.}1,$ three packets with $1\mathrm{.}2\mathrm{.}3\mathrm{.}4,$ and one packet with $33\mathrm{.}24\mathrm{.}11\mathrm{.}7,$ can you tell whether they are spoofed packets? Bob thinks that using a lower overwrite probability, say, $30\%$ instead of $50\%,$ this technique can support IP Traceback with more intermediate routers. Do you agree with him? Why?