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OK, a program is running and it was to open a TCP connect to, say, port 75 on the computer with an IP address of 1.2.3.4. So the program invokes a socket() system call to obtain a TCP socket. Then...

probably because of the data types. try converting sp[0] to an integer as well:


if int(sp[0]) == re:

It means device B is expecting to hear sequence 2001 (ACK=2001). So in step 3, when ACK is send the SEQ will be 2001.

Refer: RFC 793 (Section 3.4) (http://tools.ietf.org/html/rfc793#section-3.4)

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