DNS over TCP

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A short DNS over TCP trace

DNS can also be used over TCP instead of UDP. In this case, several requests and responses can be sent over the bytestream. The transaction identifier is still used to identify the response that matches a request. The only difference with DNS over UDP is that each DNS message is prefixed with a length field that contains the length of the DNS message. Can you infer the value of this length field in the attached TCP trace ?

#	Taille	Résumé
0	40 octets	`Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 0, Len: 0`
1	40 octets	`Transmission Control Protocol, Src Port: 53, Dst Port: 44401, Seq: 0, Ack: 1, Len: 0`
2	32 octets	`Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 1, Ack: 1, Len: 0`
3	76 octets	`Domain Name System (query)`
4	32 octets	`Transmission Control Protocol, Src Port: 53, Dst Port: 44401, Seq: 1, Ack: 45, Len: 0`
5	122 octets	`Domain Name System (response)`
6	32 octets	`Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 45, Ack: 91, Len: 0`
7	32 octets	`Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 45, Ack: 91, Len: 0`
8	32 octets	`Transmission Control Protocol, Src Port: 53, Dst Port: 44401, Seq: 91, Ack: 46, Len: 0`
9	32 octets	`Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 46, Ack: 92, Len: 0`

0000  ad710035fdf48918  00000000a0025f50
0010  727a0000020404c4  0402080aa08a9ca0
0020  0000000001030307

0000  .q.5ýô........_P
0010  rz.....Ä........
0020  ........

Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 0, Len: 0
- Source Port: 44401
- Destination Port: 53
- TCP Segment Len: 0
- Sequence number: 0 (relative sequence number)
- Acknowledgment number: 0
- 1010 .... = Header Length: 40 bytes (10)
- Flags: 0x002 (SYN)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): 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: \xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7S\xc2\xb7
- Window size value: 24400
- Calculated window size: 24400
- Checksum: 0x727a [unverified]
- Urgent pointer: 0
- Options: (20 bytes), Maximum segment size, SACK permitted, Timestamps, No-Operation (NOP), Window scale
  - TCP Option - Maximum segment size: 1220 bytes
    - Kind: Maximum Segment Size (2)
    - Length: 4
    - MSS Value: 1220
  - TCP Option - SACK permitted
    - Kind: SACK Permitted (4)
    - Length: 2
  - TCP Option - Timestamps: TSval 2693438624, TSecr 0
    - Kind: Time Stamp Option (8)
    - Length: 10
    - Timestamp value: 2693438624
    - Timestamp echo reply: 0
  - TCP Option - No-Operation (NOP)
    - Kind: No-Operation (1)
  - TCP Option - Window scale: 7 (multiply by 128)
    - Kind: Window Scale (3)
    - Length: 3
    - Shift count: 7
    - Multiplier: 128

0000  0035ad717fd81516  fdf48919a012ffff
0010  e159000002040550  0402080af456f987
0020  a08a9ca001030308

0000  .5.q.Ø..ýô....ÿÿ
0010  áY.....P....ôVù.
0020  ........

Transmission Control Protocol, Src Port: 53, Dst Port: 44401, Seq: 0, Ack: 1, Len: 0
- Source Port: 53
- Destination Port: 44401
- TCP Segment Len: 0
- Sequence number: 0 (relative sequence number)
- Acknowledgment number: 1 (relative ack number)
- 1010 .... = Header Length: 40 bytes (10)
- Flags: 0x012 (SYN, ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): 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: \xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7A\xc2\xb7\xc2\xb7S\xc2\xb7
- Window size value: 65535
- Calculated window size: 65535
- Checksum: 0xe159 [unverified]
- Urgent pointer: 0
- Options: (20 bytes), Maximum segment size, SACK permitted, Timestamps, No-Operation (NOP), Window scale
  - TCP Option - Maximum segment size: 1360 bytes
    - Kind: Maximum Segment Size (2)
    - Length: 4
    - MSS Value: 1360
  - TCP Option - SACK permitted
    - Kind: SACK Permitted (4)
    - Length: 2
  - TCP Option - Timestamps: TSval 4099340679, TSecr 2693438624
    - Kind: Time Stamp Option (8)
    - Length: 10
    - Timestamp value: 4099340679
    - Timestamp echo reply: 2693438624
  - TCP Option - No-Operation (NOP)
    - Kind: No-Operation (1)
  - TCP Option - Window scale: 8 (multiply by 256)
    - Kind: Window Scale (3)
    - Length: 3
    - Shift count: 8
    - Multiplier: 256

0000 ad710035fdf48919 7fd81517801000bf
0010 727200000101080a a08a9cb9f456f987

0000 .q.5ýô...Ø.....¿
0010 rr.........¹ôVù.

Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 1, Ack: 1, Len: 0
- Source Port: 44401
- Destination Port: 53
- TCP Segment Len: 0
- Sequence number: 1 (relative sequence number)
- Acknowledgment number: 1 (relative ack number)
- 1000 .... = Header Length: 32 bytes (8)
- Flags: 0x010 (ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): 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: \xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7A\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7
- Window size value: 191
- Calculated window size: 24448
- Window size scaling factor: 128
- Checksum: 0x7272 [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 2693438649, TSecr 4099340679
    - Kind: Time Stamp Option (8)
    - Length: 10
    - Timestamp value: 2693438649
    - Timestamp echo reply: 4099340679

0000  ad710035fdf48919  7fd81517801800bf
0010  729e00000101080a  a08a9cb9f456f987
0020  ????ec2001200001  0000000000001363
0030  6f6d70757465722d  6e6574776f726b69
0040  6e6704696e666f00  00020001

0000  .q.5ýô...Ø.....¿
0010  r..........¹ôVù.
0020  ??ì . .........c
0030  omputer-networki
0040  ng.info.....

Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 1, Ack: 1, Len: 44
- Source Port: 44401
- Destination Port: 53
- TCP Segment Len: 44
- Sequence number: 1 (relative sequence number)
- Acknowledgment number: 1 (relative ack number)
- 1000 .... = Header Length: 32 bytes (8)
- Flags: 0x018 (PSH, ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): 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: \xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7AP\xc2\xb7\xc2\xb7\xc2\xb7
- Window size value: 191
- Calculated window size: 24448
- Window size scaling factor: 128
- Checksum: 0x729e [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 2693438649, TSecr 4099340679
    - Kind: Time Stamp Option (8)
    - Length: 10
    - Timestamp value: 2693438649
    - Timestamp echo reply: 4099340679
- TCP payload (44 bytes)
- PDU Size: 44
Domain Name System (query)
- Length: ?
- Transaction ID: 0xec20
- Flags: 0x0120 Standard query
  - 0... .... .... .... = Response: Message is a query
  - .000 0... .... .... = Opcode: Standard query (0)
  - .... ..0. .... .... = Truncated: Message is not truncated
  - .... ...1 .... .... = Recursion desired: Do query recursively
  - .... .... .0.. .... = Z: reserved (0)
  - .... .... ..1. .... = AD bit: Set
  - .... .... ...0 .... = Non-authenticated data: Unacceptable
- Questions: 1
- Answer RRs: 0
- Authority RRs: 0
- Additional RRs: 0
- Queries
  - computer-networking.info: type NS, class IN
    - Name: computer-networking.info
    - Name Length: 24
    - Label Count: 2
    - Type: NS (authoritative Name Server) (2)
    - Class: IN (0x0001)

0000 0035ad717fd81517 fdf4894580100100
0010 0e6200000101080a f456f9a3a08a9cb9

0000 .5.q.Ø..ýô.E....
0010 .b......ôVù£...¹

Transmission Control Protocol, Src Port: 53, Dst Port: 44401, Seq: 1, Ack: 45, Len: 0
- Source Port: 53
- Destination Port: 44401
- TCP Segment Len: 0
- Sequence number: 1 (relative sequence number)
- Acknowledgment number: 45 (relative ack number)
- 1000 .... = Header Length: 32 bytes (8)
- Flags: 0x010 (ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): 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: \xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7A\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7
- Window size value: 256
- Calculated window size: 65536
- Window size scaling factor: 256
- Checksum: 0x0e62 [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 4099340707, TSecr 2693438649
    - Kind: Time Stamp Option (8)
    - Length: 10
    - Timestamp value: 4099340707
    - Timestamp echo reply: 2693438649

0000  0035ad717fd81517  fdf4894580180100
0010  fb8f00000101080a  f456f9aaa08a9cb9
0020  ????ec2081a00001  0002000000001363
0030  6f6d70757465722d  6e6574776f726b69
0040  6e6704696e666f00  00020001c00c0002
0050  000100000dee000f  05646e733230036f
0060  7668036e657400c0  0c0002000100000d
0070  ee0007046e733230  c03c

0000  .5.q.Ø..ýô.E....
0010  û.......ôVùª...¹
0020  ??ì ...........c
0030  omputer-networki
0040  ng.info.....À...
0050  .....î...dns20.o
0060  vh.net.À........
0070  î...ns20À<

Transmission Control Protocol, Src Port: 53, Dst Port: 44401, Seq: 1, Ack: 45, Len: 90
- Source Port: 53
- Destination Port: 44401
- TCP Segment Len: 90
- Sequence number: 1 (relative sequence number)
- Acknowledgment number: 45 (relative ack number)
- 1000 .... = Header Length: 32 bytes (8)
- Flags: 0x018 (PSH, ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): 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: \xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7AP\xc2\xb7\xc2\xb7\xc2\xb7
- Window size value: 256
- Calculated window size: 65536
- Window size scaling factor: 256
- Checksum: 0xfb8f [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 4099340714, TSecr 2693438649
    - Kind: Time Stamp Option (8)
    - Length: 10
    - Timestamp value: 4099340714
    - Timestamp echo reply: 2693438649
- TCP payload (90 bytes)
- PDU Size: 90
Domain Name System (response)
- Length: ?
- Transaction ID: 0xec20
- Flags: 0x81a0 Standard query response, No error
  - 1... .... .... .... = Response: Message is a response
  - .000 0... .... .... = Opcode: Standard query (0)
  - .... .0.. .... .... = Authoritative: Server is not an authority for domain
  - .... ..0. .... .... = Truncated: Message is not truncated
  - .... ...1 .... .... = Recursion desired: Do query recursively
  - .... .... 1... .... = Recursion available: Server can do recursive queries
  - .... .... .0.. .... = Z: reserved (0)
  - .... .... ..1. .... = Answer authenticated: Answer/authority portion was authenticated by the server
  - .... .... ...0 .... = Non-authenticated data: Unacceptable
  - .... .... .... 0000 = Reply code: No error (0)
- Questions: 1
- Answer RRs: 2
- Authority RRs: 0
- Additional RRs: 0
- Queries
  - computer-networking.info: type NS, class IN
    - Name: computer-networking.info
    - Name Length: 24
    - Label Count: 2
    - Type: NS (authoritative Name Server) (2)
    - Class: IN (0x0001)
- Answers
  - computer-networking.info: type NS, class IN, ns dns20.ovh.net
    - Name: computer-networking.info
    - Type: NS (authoritative Name Server) (2)
    - Class: IN (0x0001)
    - Time to live: 3566
    - Data length: 15
    - Name Server: dns20.ovh.net
  - computer-networking.info: type NS, class IN, ns ns20.ovh.net
    - Name: computer-networking.info
    - Type: NS (authoritative Name Server) (2)
    - Class: IN (0x0001)
    - Time to live: 3566
    - Data length: 7
    - Name Server: ns20.ovh.net

0000 ad710035fdf48945 7fd81571801000bf
0010 727200000101080a a08a9cdcf456f9aa

0000 .q.5ýô.E.Ø.q...¿
0010 rr.........ÜôVùª

Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 45, Ack: 91, Len: 0
- Source Port: 44401
- Destination Port: 53
- TCP Segment Len: 0
- Sequence number: 45 (relative sequence number)
- Acknowledgment number: 91 (relative ack number)
- 1000 .... = Header Length: 32 bytes (8)
- Flags: 0x010 (ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): 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: \xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7A\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7
- Window size value: 191
- Calculated window size: 24448
- Window size scaling factor: 128
- Checksum: 0x7272 [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 2693438684, TSecr 4099340714
    - Kind: Time Stamp Option (8)
    - Length: 10
    - Timestamp value: 2693438684
    - Timestamp echo reply: 4099340714

0000 ad710035fdf48945 7fd81571801100bf
0010 727200000101080a a08a9cddf456f9aa

0000 .q.5ýô.E.Ø.q...¿
0010 rr.........ÝôVùª

Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 45, Ack: 91, Len: 0
- Source Port: 44401
- Destination Port: 53
- TCP Segment Len: 0
- Sequence number: 45 (relative sequence number)
- Acknowledgment number: 91 (relative ack number)
- 1000 .... = Header Length: 32 bytes (8)
- Flags: 0x011 (FIN, ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): 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
  - .... .... ...1 = Fin: Set
  - TCP Flags: \xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7A\xc2\xb7\xc2\xb7\xc2\xb7F
- Window size value: 191
- Calculated window size: 24448
- Window size scaling factor: 128
- Checksum: 0x7272 [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 2693438685, TSecr 4099340714
    - Kind: Time Stamp Option (8)
    - Length: 10
    - Timestamp value: 2693438685
    - Timestamp echo reply: 4099340714

0000 0035ad717fd81571 fdf4894680110100
0010 0dbe00000101080a f456f9c7a08a9cdd

0000 .5.q.Ø.qýô.F....
0010 .¾......ôVùÇ...Ý

Transmission Control Protocol, Src Port: 53, Dst Port: 44401, Seq: 91, Ack: 46, Len: 0
- Source Port: 53
- Destination Port: 44401
- TCP Segment Len: 0
- Sequence number: 91 (relative sequence number)
- Acknowledgment number: 46 (relative ack number)
- 1000 .... = Header Length: 32 bytes (8)
- Flags: 0x011 (FIN, ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): 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
  - .... .... ...1 = Fin: Set
  - TCP Flags: \xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7A\xc2\xb7\xc2\xb7\xc2\xb7F
- Window size value: 256
- Calculated window size: 65536
- Window size scaling factor: 256
- Checksum: 0x0dbe [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 4099340743, TSecr 2693438685
    - Kind: Time Stamp Option (8)
    - Length: 10
    - Timestamp value: 4099340743
    - Timestamp echo reply: 2693438685

0000 ad710035fdf48946 7fd81572801000bf
0010 727200000101080a a08a9cf9f456f9c7

0000 .q.5ýô.F.Ø.r...¿
0010 rr.........ùôVùÇ

Transmission Control Protocol, Src Port: 44401, Dst Port: 53, Seq: 46, Ack: 92, Len: 0
- Source Port: 44401
- Destination Port: 53
- TCP Segment Len: 0
- Sequence number: 46 (relative sequence number)
- Acknowledgment number: 92 (relative ack number)
- 1000 .... = Header Length: 32 bytes (8)
- Flags: 0x010 (ACK)
  - 000. .... .... = Reserved: Not set
  - ...0 .... .... = Nonce: Not set
  - .... 0... .... = Congestion Window Reduced (CWR): 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: \xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7A\xc2\xb7\xc2\xb7\xc2\xb7\xc2\xb7
- Window size value: 191
- Calculated window size: 24448
- Window size scaling factor: 128
- Checksum: 0x7272 [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 2693438713, TSecr 4099340743
    - Kind: Time Stamp Option (8)
    - Length: 10
    - Timestamp value: 2693438713
    - Timestamp echo reply: 4099340743

Auteur(s)	Olivier Bonaventure
Date limite	Pas de date limite
Limite de soumission	Pas de limite
Étiquettes de catégories	dns

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Etiquettes

Se connecter

DNS over TCP

A short DNS over TCP trace

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DNS over TCP Masquer l'énoncé

A short DNS over TCP trace

DNS over TCP