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That depends on whose definition of socket you use and in some cases whether the packet is opening a new connection or transferring data for an existing connction. The RFC that defines TCP defines the term socket as a combination of an IP address and a port. By this definition the two packets have the same socket on the server side but different sockets on ...


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The security options from RFC 791 are long defunct. I don't think they were ever used outside of DoD (if at all).


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The initial 5 rows of the IP header are always used. So, minimum length of IP header = 5 x 4 bytes = 20 bytes. The size of the 6th row representing the Options field vary. The size of Options field can go up to 40 bytes. So, maximum length of IP header = 20 bytes + 40 bytes = 60 bytes.


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