Explain why there is no ICMP error message generated in the first part of the experiment (Step 3). Is the DF bit set in the IP datagrams?
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No ICMP error message is generated, this is because when the TCP connection is
established between PC1 and PC2, both ends of the TCP exchanged their respective MSS’s. The smaller value of these two MSS’s will be adopted as the MSS value for the connection, in this case, they picked 500 bytes, and the data generated by TCP will not be larger than 500 bytes,as a result no error occurred . Yes, the DF bit is set in the IP datagram which carried a TCP datagram.
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