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Re: [jetty-users] Websockets 1002 Unknown opcode: 7 with Jetty 10.0.24 on Mac, but not Linux, Win10

    0... .... = Fin: False
    .010 .... = Reserved: 0x2
    .0.. .... = Per-Message Compressed: False
    .... 1110 = Opcode: Unknown (14)
    0... .... = Mask: False
    .011 0000 = Payload length: 48

These look like bad data that is trying to be parsed as a websocket frame.

Could you open an issue on the Jetty project github page with a simple reproducer of the issue, or some Jetty debug logs so we can see why this could be happening.

cheers,
Lachlan

On Tue, Oct 15, 2024 at 8:04 PM Alexander Farber via jetty-users <jetty-users@xxxxxxxxxxx> wrote:
Here frames 47-50, sorry I was not sure which ones are important:

Frame 47: 618 bytes on wire (4944 bits), 618 bytes captured (4944 bits) on interface lo0, id 0
    Section number: 1
    Interface id: 0 (lo0)
        Interface name: lo0
        Interface description: Loopback
    Encapsulation type: NULL/Loopback (15)
    Arrival Time: Oct 15, 2024 10:04:29.250987000 CEST
    UTC Arrival Time: Oct 15, 2024 08:04:29.250987000 UTC
    Epoch Arrival Time: 1728979469.250987000
    [Time shift for this packet: 0.000000000 seconds]
    [Time delta from previous captured frame: 0.000211000 seconds]
    [Time delta from previous displayed frame: 0.000211000 seconds]
    [Time since reference or first frame: 1.517462000 seconds]
    Frame Number: 47
    Frame Length: 618 bytes (4944 bits)
    Capture Length: 618 bytes (4944 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: null:ip:tcp:http:websocket]
Null/Loopback
    Family: IP (2)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 614
    Identification: 0x0000 (0)
    010. .... = Flags: 0x2, Don't fragment
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    ...0 0000 0000 0000 = Fragment Offset: 0
    Time to Live: 64
    Protocol: TCP (6)
    Header Checksum: 0x0000 [validation disabled]
    [Header checksum status: Unverified]
    Source Address: 127.0.0.1
    Destination Address: 127.0.0.1
    [Stream index: 0]
Transmission Control Protocol, Src Port: 60903, Dst Port: 8080, Seq: 563, Ack: 200, Len: 562
    Source Port: 60903
    Destination Port: 8080
    [Stream index: 12]
    [Conversation completeness: Incomplete, DATA (15)]
        ..0. .... = RST: Absent
        ...0 .... = FIN: Absent
        .... 1... = Data: Present
        .... .1.. = ACK: Present
        .... ..1. = SYN-ACK: Present
        .... ...1 = SYN: Present
        [Completeness Flags: ··DASS]
    [TCP Segment Len: 562]
    Sequence Number: 563    (relative sequence number)
    Sequence Number (raw): 1424653802
    [Next Sequence Number: 1125    (relative sequence number)]
    Acknowledgment Number: 200    (relative ack number)
    Acknowledgment number (raw): 1179582105
    1000 .... = Header Length: 32 bytes (8)
    Flags: 0x018 (PSH, 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
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······AP···]
    Window: 6376
    [Calculated window size: 408064]
    [Window size scaling factor: 64]
    Checksum: 0x005b [unverified]
    [Checksum Status: Unverified]
    Urgent Pointer: 0
    Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - Timestamps: TSval 1247263607, TSecr 983459320
            Kind: Time Stamp Option (8)
            Length: 10
            Timestamp value: 1247263607
            Timestamp echo reply: 983459320
    [Timestamps]
        [Time since first frame in this TCP stream: 0.005977000 seconds]
        [Time since previous frame in this TCP stream: 0.001815000 seconds]
    [SEQ/ACK analysis]
        [iRTT: 0.000055000 seconds]
        [Bytes in flight: 562]
        [Bytes sent since last PSH flag: 562]
    TCP payload (562 bytes)
    [PDU Size: 71]
    [PDU Size: 47]
    [PDU Size: 124]
    [PDU Size: 50]
    [PDU Size: 51]
    [PDU Size: 34]
    [PDU Size: 99]
    TCP segment data (86 bytes)
WebSocket
    0... .... = Fin: False
    .100 .... = Reserved: 0x4
    .1.. .... = Per-Message Compressed: True
    .... 0111 = Opcode: Unknown (7)
    0... .... = Mask: False
    .100 0101 = Payload length: 69
    Payload
WebSocket
    0... .... = Fin: False
    .110 .... = Reserved: 0x6
    .1.. .... = Per-Message Compressed: True
    .... 1111 = Opcode: Unknown (15)
    0... .... = Mask: False
    .010 1101 = Payload length: 45
    Payload
        Unknown: 63616368650d0a43616368652d436f6e74726f6c3a206e6f2d63616368650d0a557365722d4167656e743a204d
            [Expert Info (Note/Undecoded): Dissector for Websocket Opcode (15) code not implemented, Contact Wireshark developers if you want this supported]
                [Dissector for Websocket Opcode (15) code not implemented, Contact Wireshark developers if you want this supported]
                [Severity level: Note]
                [Group: Undecoded]
WebSocket
    0... .... = Fin: False
    .110 .... = Reserved: 0x6
    .1.. .... = Per-Message Compressed: True
    .... 1111 = Opcode: Unknown (15)
    0... .... = Mask: False
    .111 1010 = Payload length: 122
    Payload
        Unknown […]: 696c6c612f352e3020284d6163696e746f73683b20496e74656c204d6163204f5320582031305f31355f3729204170706c655765624b69742f3533372e333620284b48544d4c2c206c696b65204765636b6f29204368726f6d652f3132392e302e302e30205361666172692f3533372e
            [Expert Info (Note/Undecoded): Dissector for Websocket Opcode (15) code not implemented, Contact Wireshark developers if you want this supported]
                [Dissector for Websocket Opcode (15) code not implemented, Contact Wireshark developers if you want this supported]
                [Severity level: Note]
                [Group: Undecoded]
WebSocket
    0... .... = Fin: False
    .010 .... = Reserved: 0x2
    .0.. .... = Per-Message Compressed: False
    .... 1110 = Opcode: Unknown (14)
    0... .... = Mask: False
    .011 0000 = Payload length: 48
    Payload
        Unknown: 2e302e300d0a557067726164653a20776562736f636b65740d0a4f726967696e3a20687474703a2f2f3132372e302e30
            [Expert Info (Note/Undecoded): Dissector for Websocket Opcode (14) code not implemented, Contact Wireshark developers if you want this supported]
                [Dissector for Websocket Opcode (14) code not implemented, Contact Wireshark developers if you want this supported]
                [Severity level: Note]
                [Group: Undecoded]
WebSocket
    0... .... = Fin: False
    .010 .... = Reserved: 0x2
    .0.. .... = Per-Message Compressed: False
    .... 1110 = Opcode: Unknown (14)
    0... .... = Mask: False
    .011 0001 = Payload length: 49
    Payload
        Unknown: 3a383038300d0a5365632d576562536f636b65742d56657273696f6e3a2031330d0a4163636570742d456e636f64696e67
            [Expert Info (Note/Undecoded): Dissector for Websocket Opcode (14) code not implemented, Contact Wireshark developers if you want this supported]
                [Dissector for Websocket Opcode (14) code not implemented, Contact Wireshark developers if you want this supported]
                [Severity level: Note]
                [Group: Undecoded]
WebSocket
    0... .... = Fin: False
    .011 .... = Reserved: 0x3
    .0.. .... = Per-Message Compressed: False
    .... 1010 = Opcode: Pong (10)
    0... .... = Mask: False
    .010 0000 = Payload length: 32
    Payload
        Pong: 677a69702c206465666c6174652c2062722c207a7374640d0a4163636570742d
WebSocket
    0... .... = Fin: False
    .100 .... = Reserved: 0x4
    .1.. .... = Per-Message Compressed: True
    .... 1100 = Opcode: Unknown (12)
    0... .... = Mask: False
    .110 0001 = Payload length: 97
    Payload
        Unknown: 6e67756167653a20656e2d47422c656e3b713d302e392c656e2d55533b713d302e382c64653b713d302e372c72753b713d302e362c64652d44453b713d302e350d0a5365632d576562536f636b65742d4b65793a20754f373674326b4b46564c39
            [Expert Info (Note/Undecoded): Dissector for Websocket Opcode (12) code not implemented, Contact Wireshark developers if you want this supported]
                [Dissector for Websocket Opcode (12) code not implemented, Contact Wireshark developers if you want this supported]
                [Severity level: Note]
                [Group: Undecoded]

Frame 48: 56 bytes on wire (448 bits), 56 bytes captured (448 bits) on interface lo0, id 0
    Section number: 1
    Interface id: 0 (lo0)
        Interface name: lo0
        Interface description: Loopback
    Encapsulation type: NULL/Loopback (15)
    Arrival Time: Oct 15, 2024 10:04:29.251004000 CEST
    UTC Arrival Time: Oct 15, 2024 08:04:29.251004000 UTC
    Epoch Arrival Time: 1728979469.251004000
    [Time shift for this packet: 0.000000000 seconds]
    [Time delta from previous captured frame: 0.000017000 seconds]
    [Time delta from previous displayed frame: 0.000017000 seconds]
    [Time since reference or first frame: 1.517479000 seconds]
    Frame Number: 48
    Frame Length: 56 bytes (448 bits)
    Capture Length: 56 bytes (448 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: null:ip:tcp]
Null/Loopback
    Family: IP (2)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 52
    Identification: 0x0000 (0)
    010. .... = Flags: 0x2, Don't fragment
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    ...0 0000 0000 0000 = Fragment Offset: 0
    Time to Live: 64
    Protocol: TCP (6)
    Header Checksum: 0x0000 [validation disabled]
    [Header checksum status: Unverified]
    Source Address: 127.0.0.1
    Destination Address: 127.0.0.1
    [Stream index: 0]
Transmission Control Protocol, Src Port: 8080, Dst Port: 60903, Seq: 200, Ack: 1125, Len: 0
    Source Port: 8080
    Destination Port: 60903
    [Stream index: 12]
    [Conversation completeness: Incomplete, DATA (15)]
        ..0. .... = RST: Absent
        ...0 .... = FIN: Absent
        .... 1... = Data: Present
        .... .1.. = ACK: Present
        .... ..1. = SYN-ACK: Present
        .... ...1 = SYN: Present
        [Completeness Flags: ··DASS]
    [TCP Segment Len: 0]
    Sequence Number: 200    (relative sequence number)
    Sequence Number (raw): 1179582105
    [Next Sequence Number: 200    (relative sequence number)]
    Acknowledgment Number: 1125    (relative ack number)
    Acknowledgment number (raw): 1424654364
    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: 6362
    [Calculated window size: 407168]
    [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)
            Kind: No-Operation (1)
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - Timestamps: TSval 983459321, TSecr 1247263607
            Kind: Time Stamp Option (8)
            Length: 10
            Timestamp value: 983459321
            Timestamp echo reply: 1247263607
    [Timestamps]
        [Time since first frame in this TCP stream: 0.005994000 seconds]
        [Time since previous frame in this TCP stream: 0.000017000 seconds]
    [SEQ/ACK analysis]
        [This is an ACK to the segment in frame: 47]
        [The RTT to ACK the segment was: 0.000017000 seconds]
        [iRTT: 0.000055000 seconds]

Frame 49: 288 bytes on wire (2304 bits), 288 bytes captured (2304 bits) on interface lo0, id 0
    Section number: 1
    Interface id: 0 (lo0)
        Interface name: lo0
        Interface description: Loopback
    Encapsulation type: NULL/Loopback (15)
    Arrival Time: Oct 15, 2024 10:04:29.251013000 CEST
    UTC Arrival Time: Oct 15, 2024 08:04:29.251013000 UTC
    Epoch Arrival Time: 1728979469.251013000
    [Time shift for this packet: 0.000000000 seconds]
    [Time delta from previous captured frame: 0.000009000 seconds]
    [Time delta from previous displayed frame: 0.000009000 seconds]
    [Time since reference or first frame: 1.517488000 seconds]
    Frame Number: 49
    Frame Length: 288 bytes (2304 bits)
    Capture Length: 288 bytes (2304 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: null:ip:tcp:http:websocket:http:websocket]
Null/Loopback
    Family: IP (2)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 284
    Identification: 0x0000 (0)
    010. .... = Flags: 0x2, Don't fragment
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    ...0 0000 0000 0000 = Fragment Offset: 0
    Time to Live: 64
    Protocol: TCP (6)
    Header Checksum: 0x0000 [validation disabled]
    [Header checksum status: Unverified]
    Source Address: 127.0.0.1
    Destination Address: 127.0.0.1
    [Stream index: 0]
Transmission Control Protocol, Src Port: 60903, Dst Port: 8080, Seq: 1125, Ack: 200, Len: 232
    Source Port: 60903
    Destination Port: 8080
    [Stream index: 12]
    [Conversation completeness: Incomplete, DATA (15)]
        ..0. .... = RST: Absent
        ...0 .... = FIN: Absent
        .... 1... = Data: Present
        .... .1.. = ACK: Present
        .... ..1. = SYN-ACK: Present
        .... ...1 = SYN: Present
        [Completeness Flags: ··DASS]
    [TCP Segment Len: 232]
    Sequence Number: 1125    (relative sequence number)
    Sequence Number (raw): 1424654364
    [Next Sequence Number: 1357    (relative sequence number)]
    Acknowledgment Number: 200    (relative ack number)
    Acknowledgment number (raw): 1179582105
    1000 .... = Header Length: 32 bytes (8)
    Flags: 0x018 (PSH, 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
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······AP···]
    Window: 6376
    [Calculated window size: 408064]
    [Window size scaling factor: 64]
    Checksum: 0xff10 [unverified]
    [Checksum Status: Unverified]
    Urgent Pointer: 0
    Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - Timestamps: TSval 1247263607, TSecr 983459321
            Kind: Time Stamp Option (8)
            Length: 10
            Timestamp value: 1247263607
            Timestamp echo reply: 983459321
    [Timestamps]
        [Time since first frame in this TCP stream: 0.006003000 seconds]
        [Time since previous frame in this TCP stream: 0.000009000 seconds]
    [SEQ/ACK analysis]
        [iRTT: 0.000055000 seconds]
        [Bytes in flight: 232]
        [Bytes sent since last PSH flag: 232]
    TCP payload (232 bytes)
    [PDU Size: 101]
    TCP segment data (15 bytes)
    [PDU Size: 17]
    [PDU Size: 60]
    [PDU Size: 46]
    [PDU Size: 51]
    TCP segment data (43 bytes)
[2 Reassembled TCP Segments (101 bytes): #47(86), #49(15)]
    [Frame: 47, payload: 0-85 (86 bytes)]
    [Frame: 49, payload: 86-100 (15 bytes)]
    [Segment count: 2]
    [Reassembled TCP length: 101]
    [Reassembled TCP Data: 436369447277766c43673d3d0d0a5365632d576562536f636b65742d457874656e73696f6e733a207065726d6573736167652d6465666c6174653b20636c69656e745f6d61785f77696e646f775f626974730d0a0d0ac1fe00e0f0916dc27c1e2c8933a16d]
WebSocket
    0... .... = Fin: False
    .100 .... = Reserved: 0x4
    .1.. .... = Per-Message Compressed: True
    .... 0011 = Opcode: Unknown (3)
    0... .... = Mask: False
    .110 0011 = Payload length: 99
    Payload
WebSocket
    1... .... = Fin: True
    .000 .... = Reserved: 0x0
    .0.. .... = Per-Message Compressed: False
    .... 0100 = Opcode: Unknown (4)
    0... .... = Mask: False
    .000 1111 = Payload length: 15
    Payload
Decompression failed
    [Expert Info (Warning/Protocol): Decompression failed]
        [Decompression failed]
        [Severity level: Warning]
        [Group: Protocol]
WebSocket
    1... .... = Fin: True
    .011 .... = Reserved: 0x3
    .0.. .... = Per-Message Compressed: False
    .... 0000 = Opcode: Continuation (0)
    1... .... = Mask: True
    .011 0110 = Payload length: 54
    Masking-Key: 4f5056f8
    Masked payload
    Payload
[3 Reassembled websocket Fragments (222 bytes): #47(69), #49(99), #49(54)]
    [Frame: 47, payload: 0-68 (69 bytes)]
    [Frame: 49, payload: 69-167 (99 bytes)]
    [Frame: 49, payload: 168-221 (54 bytes)]
    [Fragment count: 3]
    [Reassembled websocket Payload length: 222]
Decompression failed
    [Expert Info (Warning/Protocol): Decompression failed]
        [Decompression failed]
        [Severity level: Warning]
        [Group: Protocol]
WebSocket
    1... .... = Fin: True
    .110 .... = Reserved: 0x6
    .1.. .... = Per-Message Compressed: True
    .... 0000 = Opcode: Continuation (0)
    1... .... = Mask: True
    .010 1000 = Payload length: 40
    Masking-Key: ec5e6214
    Masked payload
    Payload
Decompression failed
    [Expert Info (Warning/Protocol): Decompression failed]
        [Decompression failed]
        [Severity level: Warning]
        [Group: Protocol]
WebSocket
    1... .... = Fin: True
    .011 .... = Reserved: 0x3
    .0.. .... = Per-Message Compressed: False
    .... 1010 = Opcode: Pong (10)
    0... .... = Mask: False
    .011 0001 = Payload length: 49
    Payload
        Pong: 639b2e10b3cbc71297e3fcafeffd332c3d7680338c29c26bc5e698f98b701cbe965c03b508e9b7157f375770e3c4feecbe

Frame 50: 56 bytes on wire (448 bits), 56 bytes captured (448 bits) on interface lo0, id 0
    Section number: 1
    Interface id: 0 (lo0)
        Interface name: lo0
        Interface description: Loopback
    Encapsulation type: NULL/Loopback (15)
    Arrival Time: Oct 15, 2024 10:04:29.251016000 CEST
    UTC Arrival Time: Oct 15, 2024 08:04:29.251016000 UTC
    Epoch Arrival Time: 1728979469.251016000
    [Time shift for this packet: 0.000000000 seconds]
    [Time delta from previous captured frame: 0.000003000 seconds]
    [Time delta from previous displayed frame: 0.000003000 seconds]
    [Time since reference or first frame: 1.517491000 seconds]
    Frame Number: 50
    Frame Length: 56 bytes (448 bits)
    Capture Length: 56 bytes (448 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: null:ip:tcp]
Null/Loopback
    Family: IP (2)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 52
    Identification: 0x0000 (0)
    010. .... = Flags: 0x2, Don't fragment
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    ...0 0000 0000 0000 = Fragment Offset: 0
    Time to Live: 64
    Protocol: TCP (6)
    Header Checksum: 0x0000 [validation disabled]
    [Header checksum status: Unverified]
    Source Address: 127.0.0.1
    Destination Address: 127.0.0.1
    [Stream index: 0]
Transmission Control Protocol, Src Port: 8080, Dst Port: 60903, Seq: 200, Ack: 1357, Len: 0
    Source Port: 8080
    Destination Port: 60903
    [Stream index: 12]
    [Conversation completeness: Incomplete, DATA (15)]
        ..0. .... = RST: Absent
        ...0 .... = FIN: Absent
        .... 1... = Data: Present
        .... .1.. = ACK: Present
        .... ..1. = SYN-ACK: Present
        .... ...1 = SYN: Present
        [Completeness Flags: ··DASS]
    [TCP Segment Len: 0]
    Sequence Number: 200    (relative sequence number)
    Sequence Number (raw): 1179582105
    [Next Sequence Number: 200    (relative sequence number)]
    Acknowledgment Number: 1357    (relative ack number)
    Acknowledgment number (raw): 1424654596
    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: 6358
    [Calculated window size: 406912]
    [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)
            Kind: No-Operation (1)
        TCP Option - No-Operation (NOP)
            Kind: No-Operation (1)
        TCP Option - Timestamps: TSval 983459321, TSecr 1247263607
            Kind: Time Stamp Option (8)
            Length: 10
            Timestamp value: 983459321
            Timestamp echo reply: 1247263607
    [Timestamps]
        [Time since first frame in this TCP stream: 0.006006000 seconds]
        [Time since previous frame in this TCP stream: 0.000003000 seconds]
    [SEQ/ACK analysis]
        [This is an ACK to the segment in frame: 49]
        [The RTT to ACK the segment was: 0.000003000 seconds]
        [iRTT: 0.000055000 seconds]
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