Suppose you are interested in detecting the number of hosts behind a NAT.You observe
Chapter 4, Problem P22(choose chapter or problem)
Suppose you are interested in detecting the number of hosts behind a NAT.You observe that the IP layer stamps an identification number sequentially oneach IP packet. The identification number of the first IP packet generated bya host is a random number, and the identification numbers of the subsequentIP packets are sequentially assigned. Assume all IP packets generated byhosts behind the NAT are sent to the outside world.a. Based on this observation, and assuming you can sniff all packets sent bythe NAT to the outside, can you outline a simple technique that detects thenumber of unique hosts behind a NAT? Justify your answer.b. If the identification numbers are not sequentially assigned but randomlyassigned, would your technique work? Justify your answer.
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