windows-server-2012 – Receiver将TCP窗口大小限制为64,512

发件人SYN

No.     Time           Source                Destination           Protocol Length Delta      Sequence number Acknowledgment number Bytes in flight Calculated window size Info
    814 5.036577000    10.10.0.21            10.11.0.1             TCP      66     0.000000000 0               0                                     64512                  49758→5001 [SYN,ECN,CWR] Seq=0 Win=64512 Len=0 MSS=1460 WS=1 SACK_PERM=1

Frame 814: 66 bytes on wire (528 bits),66 bytes captured (528 bits) on interface 0
Ethernet II,Src: 00:11:22:33:44:55,Dst: aa:bb:cc:dd:ee:ff
Internet Protocol Version 4,Src: 10.10.0.21 (10.10.0.21),Dst: 10.11.0.1 (10.11.0.1)
Transmission Control Protocol,Src Port: 49758 (49758),Dst Port: 5001 (5001),Seq: 0,Len: 0
    Source Port: 49758 (49758)
    Destination Port: 5001 (5001)
    [Stream index: 73]
    [TCP Segment Len: 0]
    Sequence number: 0    (relative sequence number)
    Acknowledgment number: 0
    Header Length: 32 bytes
    .... 0000 1100 0010 = Flags: 0x0c2 (SYN,CWR)
    Window size value: 64512
    [Calculated window size: 64512]
    Checksum: 0x1451 [validation disabled]
    Urgent pointer: 0
    Options: (12 bytes),Maximum segment size,No-Operation (NOP),Window scale,SACK permitted
        Maximum segment size: 1460 bytes
        No-Operation (NOP)
        Window scale: 0 (multiply by 1)
            Kind: Window Scale (3)
            Length: 3
            Shift count: 0
            [Multiplier: 1]
        No-Operation (NOP)
        No-Operation (NOP)
        TCP SACK Permitted Option: True

序列图的发送者视角

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