TCP【三次握手】

Frame 4: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) on interface -, id 0
Ethernet II, Src: NexoCommunic_00:03:00 (00:50:00:00:03:00), Dst: NexoCommunic_00:04:01 (00:50:00:00:04:01)
Internet Protocol Version 4, Src: 192.168.1.12, Dst: 192.168.1.10
Transmission Control Protocol, Src Port: 47284, Dst Port: 80, Seq: 0, Len: 0
    Source Port: 47284
    Destination Port: 80
    [Stream index: 0]
    [Conversation completeness: Complete, WITH_DATA (31)]
    [TCP Segment Len: 0]
    Sequence Number: 0    (relative sequence number)
    Sequence Number (raw): 2985961247
    [Next Sequence Number: 1    (relative sequence number)]
    Acknowledgment Number: 0
    Acknowledgment number (raw): 0
    1010 .... = Header Length: 40 bytes (10)
    Flags: 0x002 (SYN)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Accurate ECN: Not set
        .... 0... .... = Congestion Window Reduced: Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...0 .... = Acknowledgment: Not set
        .... .... 0... = Push: Not set
        .... .... .0.. = Reset: Not set
        .... .... ..1. = Syn: Set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ··········S·]
    Window: 64240
    [Calculated window size: 64240]
    Checksum: 0x8395 [unverified]
    [Checksum Status: Unverified]
    Urgent Pointer: 0
    Options: (20 bytes), Maximum segment size, SACK permitted, Timestamps, No-Operation (NOP), Window scale
    [Timestamps]

Frame 5: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) on interface -, id 0
Ethernet II, Src: NexoCommunic_00:04:01 (00:50:00:00:04:01), Dst: NexoCommunic_00:03:00 (00:50:00:00:03:00)
Internet Protocol Version 4, Src: 192.168.1.10, Dst: 192.168.1.12
Transmission Control Protocol, Src Port: 80, Dst Port: 47284, Seq: 0, Ack: 1, Len: 0
    Source Port: 80
    Destination Port: 47284
    [Stream index: 0]
    [Conversation completeness: Complete, WITH_DATA (31)]
    [TCP Segment Len: 0]
    Sequence Number: 0    (relative sequence number)
    Sequence Number (raw): 2328244449
    [Next Sequence Number: 1    (relative sequence number)]
    Acknowledgment Number: 1    (relative ack number)
    Acknowledgment number (raw): 2985961248
    1010 .... = Header Length: 40 bytes (10)
    Flags: 0x012 (SYN, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Accurate ECN: Not set
        .... 0... .... = Congestion Window Reduced: Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 0... = Push: Not set
        .... .... .0.. = Reset: Not set
        .... .... ..1. = Syn: Set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······A··S·]
    Window: 65160
    [Calculated window size: 65160]
    Checksum: 0xf077 [unverified]
    [Checksum Status: Unverified]
    Urgent Pointer: 0
    Options: (20 bytes), Maximum segment size, SACK permitted, Timestamps, No-Operation (NOP), Window scale
    [Timestamps]
    [SEQ/ACK analysis]

Frame 6: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) on interface -, id 0
Ethernet II, Src: NexoCommunic_00:03:00 (00:50:00:00:03:00), Dst: NexoCommunic_00:04:01 (00:50:00:00:04:01)
Internet Protocol Version 4, Src: 192.168.1.12, Dst: 192.168.1.10
Transmission Control Protocol, Src Port: 47284, Dst Port: 80, Seq: 1, Ack: 1, Len: 0
    Source Port: 47284
    Destination Port: 80
    [Stream index: 0]
    [Conversation completeness: Complete, WITH_DATA (31)]
    [TCP Segment Len: 0]
    Sequence Number: 1    (relative sequence number)
    Sequence Number (raw): 2985961248
    [Next Sequence Number: 1    (relative sequence number)]
    Acknowledgment Number: 1    (relative ack number)
    Acknowledgment number (raw): 2328244450
    1000 .... = Header Length: 32 bytes (8)
    Flags: 0x010 (ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Accurate ECN: Not set
        .... 0... .... = Congestion Window Reduced: Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 0... = Push: Not set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······A····]
    Window: 502
    [Calculated window size: 64256]
    [Window size scaling factor: 128]
    Checksum: 0x838d [unverified]
    [Checksum Status: Unverified]
    Urgent Pointer: 0
    Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
    [Timestamps]
    [SEQ/ACK analysis]