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TCP 1TCP(2)TCPContentsTCP ............................................................................................... 1ACK ......................................................................................... 5使TCP 使使使1:SYNFrame 13: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) on interface lo0, id 0Null/LoopbackInternet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1 TCP 2Transmission Control Protocol, Src Port: 64255, Dst Port: 10240, Seq: 0, Len: 0 Source Port: 64255 Destination Port: 10240 [Stream index: 0] [TCP Segment Len: 0] Sequence number: 0 (relative sequence number) Sequence number (raw): 3261314628 [Next sequence number: 1 (relative sequence number)] Acknowledgment number: 0 Acknowledgment number (raw): 0 1011 .... = Header Length: 44 bytes (11) Flags: 0x002 (SYN) Window size value: 65535 [Calculated window size: 65535] Checksum: 0xfe34 [unverified] [Checksum Status: Unverified] Urgent pointer: 0 Options: (24 bytes), Maximum segment size, No-Operation (NOP), Window scale, No-Operation (NOP), No-Operation (NOP), Timestamps, SACK permitted, End of Option List (EOL) TCP Option - Maximum segment size: 16344 bytes TCP Option - No-Operation (NOP) TCP Option - Window scale: 6 (multiply by 64) TCP Option - No-Operation (NOP) TCP Option - No-Operation (NOP) TCP Option - Timestamps: TSval 740812626, TSecr 0 TCP Option - SACK permitted TCP Option - End of Option List (EOL) [Timestamps]2:SYN/ACKFrame 14: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) on interface lo0, id 0Null/LoopbackInternet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1Transmission Control Protocol, Src Port: 10240, Dst Port: 64255, Seq: 0, Ack: 1, Len: 0 Source Port: 10240 Destination Port: 64255 [Stream index: 0] [TCP Segment Len: 0] Sequence number: 0 (relative sequence number) Sequence number (raw): 1175996045 [Next sequence number: 1 (relative sequence number)] Acknowledgment number: 1 (relative ack number) Acknowledgment number (raw): 3261314629 1011 .... = Header Length: 44 bytes (11) Flags: 0x012 (SYN, ACK) Window size value: 65535 [Calculated window size: 65535] TCP 3 Checksum: 0xfe34 [unverified] [Checksum Status: Unverified] Urgent pointer: 0 Options: (24 bytes), Maximum segment size, No-Operation (NOP), Window scale, No-Operation (NOP), No-Operation (NOP), Timestamps, SACK permitted, End of Option List (EOL) TCP Option - Maximum segment size: 16344 bytes TCP Option - No-Operation (NOP) TCP Option - Window scale: 6 (multiply by 64) TCP Option - No-Operation (NOP) TCP Option - No-Operation (NOP) TCP Option - Timestamps: TSval 740812626, TSecr 740812626 TCP Option - SACK permitted TCP Option - End of Option List (EOL) [SEQ/ACK analysis] [Timestamps]3:ACKFrame 15: 56 bytes on wire (448 bits), 56 bytes captured (448 bits) on interface lo0, id 0Null/LoopbackInternet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1Transmission Control Protocol, Src Port: 64255, Dst Port: 10240, Seq: 1, Ack: 1, Len: 0 Source Port: 64255 Destination Port: 10240 [Stream index: 0] [TCP Segment Len: 0] Sequence number: 1 (relative sequence number) Sequence number (raw): 3261314629 [Next sequence number: 1 (relative sequence number)] Acknowledgment number: 1 (relative ack number) Acknowledgment number (raw): 1175996046 1000 .... = Header Length: 32 bytes (8) Flags: 0x010 (ACK) Window size value: 6379 [Calculated window size: 408256] [Window size scaling factor: 64] Checksum: 0xfe28 [unverified] [Checksum Status: Unverified] Urgent pointer: 0 Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps TCP Option - No-Operation (NOP) TCP Option - No-Operation (NOP) TCP Option - Timestamps: TSval 740812626, TSecr 740812626 [SEQ/ACK analysis] [Timestamps] TCP 41:PSH/ACKTransmission Control Protocol, Src Port: 64255, Dst Port: 10240, Seq: 1, Ack: 1, Len: 12 Source Port: 64255 Destination Port: 10240 [Stream index: 0] [TCP Segment Len: 12] Sequence number: 1 (relative sequence number) Sequence number (raw): 3261314629 [Next sequence number: 13 (relative sequence number)] Acknowledgment number: 1 (relative ack number) Acknowledgment number (raw): 1175996046 1000 .... = Header Length: 32 bytes (8) Flags: 0x018 (PSH, ACK) Window size value: 6379 [Calculated window size: 6379] [Window size scaling factor: -1 (unknown)] Checksum: 0xfe34 [unverified] [Checksum Status: Unverified] Urgent pointer: 0 Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps TCP Option - No-Operation (NOP) TCP Option - No-Operation (NOP) TCP Option - Timestamps: TSval 742069804, TSecr 740812626 [SEQ/ACK analysis] [Timestamps] TCP payload (12 bytes)2:ACKTransmission Control Protocol, Src Port: 10240, Dst Port: 64255, Seq: 1, Ack: 13, Len: 0 Source Port: 10240 Destination Port: 64255 [Stream index: 0] [TCP Segment Len: 0] Sequence number: 1 (relative sequence number) Sequence number (raw): 1175996046 [Next sequence number: 1 (relative sequence number)] Acknowledgment number: 13 (relative ack number) Acknowledgment number (raw): 3261314641 1000 .... = Header Length: 32 bytes (8) Flags: 0x010 (ACK) Window size value: 6379 [Calculated window size: 6379] [Window size scaling factor: -1 (unknown)] Checksum: 0xfe28 [unverified] [Checksum Status: Unverified] Urgent pointer: 0 Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps ACK5 TCP Option - No-Operation (NOP) TCP Option - No-Operation (NOP) TCP Option - Timestamps: TSval 742069804, TSecr 742069804 [SEQ/ACK analysis] [This is an ACK to the segment in frame: 13] [The RTT to ACK the segment was: 0.000040000 seconds] [Timestamps]ACK

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