Update 'Test_Cases/Test_Case1/readme'
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The values for the header fields are:
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Verison = 4, to indicate IPv4 version is used.
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IHL = 5, which indicates 20 bytes.
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Type of Service = 0,
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Total Window size = 40, which is 28 in hex. The total windows size contains the total lenght of IP header plus data.
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Identification = 0001,
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Flags = All flags are set to zero,
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Fragment Offset = For now, there is no fragment offset so, this value is set to 0.
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Source IP = 200.204.10.12, which is c8cc 0a0c in hex
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Destination IP = 200.204.10.14, which is c8cc 0a0e in hex
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Source Port = 1234, which is 04D2 in hex,
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Destination Port = 4444, which is 115c in hex.
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1. Verison = 4, to indicate IPv4 version is used.
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2. IHL = 5, which indicates 20 bytes.
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3. Type of Service = 0,
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4. Total Window size = 40, which is 28 in hex. The total windows size contains the total lenght of IP header plus data.
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5. Identification = 0001,
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6. Flags = All flags are set to zero,
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7. Fragment Offset = For now, there is no fragment offset so, this value is set to 0.
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8. TTL = 40s, which is 28 in hex.
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9. Protocol = 6, which indicates TCP.
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10. Header Checksum = initially zero and then changed to the sum of 16 bit values of header + data.
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11. Source IP = 200.204.10.12, which is c8cc 0a0c in hex
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12. Destination IP = 200.204.10.14, which is c8cc 0a0e in hex
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13. Source Port = 1234, which is 04D2 in hex,
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14. Destination Port = 4444, which is 115c in hex.
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15. Sequence Number = 0 for now,
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16. Acknowledgement Number = 0,
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17. Flags:
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For the SYN packet, the SYN Flag in the header has a value of 1.
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For the SYN+ACK packet, the SYN and ACK flags in the header have a value of 1.
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For the ACK packet, the ACK flag in the header has a value of 1.
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For the FIN packet, the FIN flag in the header has a value of 1.
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For the FIN+ACK packet, the FIN and ACK flags in the header have a value of 1.
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For the FIN+ACK packet, the FIN and ACK flags in the header have a value of 1.
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18. TCP Checksum = initially zero, then:
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(i) Concatenate TCP Pseudo header (Protocol, Source IP, Destination IP, Total Length) with TCP header and TCP data. This creates a big integer.
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(ii) Convert this integer to binary and compute bit wise 1's complement.
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