TCP to MPTCP Brief Explanation

1. From TCP to MPTCP Brief Explanation: {RFC 793, RFC 6824 } By HADJI Akrem <akrem.hadji@supcom.tn> 15/7/2016 1

2. Content  I) TCP protocol i. Transmission Control Protocol TCP ii. TCP PROTOCOL STACK iii. TCP HEADER iv. TCP HEADER { Seq vs Ack} v. TCP CONNECTION INITIATION vi. TCP TRAFFIC DURING ESTABLICHED SESSION vii. TCP CLOSING CONNECTION o II) MPTCP i. Multi-path TCP (MPTCP) ii. MTCP PROTOCOL STACK iii. MPTCP simple scenario iv. INITIAL CONNECTION SETUP MP_CAPABLE Subtype v. INITIAL CONNECTION SETUP vi. Additional subflow setup Methode 1 vii. Additional subflow setup viii. Additional subflow setup Methode 2 (box) ix. DATA MAPPING x. Data Sequence Signal:DSS xi. Closing MPTCP connection 2

3. Transmission Control Protocol TCP  TCP is a transport layer protocole  The main goal of TCP is to make sure that the sender and the receiver exchange traffic in order and without any loss. 3

4. TCP PROTOCOL STACK 4

5. TCP PROTOCOL STACK Physical 4

6. TCP PROTOCOL STACK LINK Physical 4

7. TCP PROTOCOL STACK IP LINK Physical 4

8. TCP PROTOCOL STACK TCP IP LINK Physical 4

9. TCP PROTOCOL STACK TCP IP APPLICATION LINK Physical 4

10. TCP PROTOCOL STACK TCP IP APPLICATION LINK Physical TRANSPORT 4

11. TCP HEADER  TCP header major prams :  Source port :served process port of the main host  Destination port :distination process port  Sequence (Seq): total sent data (the sender received their ACK)  Acknowledgement (Ack): total received data  Length: length of TCP segment payload  Options 5

12. TCP HEADER { Seq vs Ack}  Each time an A host receives or send a TCP segment to B, it should answer these tow questions:  How much data RECEIVED (since the beginning of TCP connection) ???  How much data SEND to B( B acknowledged me that it was received)???  The amount of received data will be add into Acknowledgement field {Ack} in each segment.  The amount of sent data will be add into Sequence field {Seq} in each segment.  If segment contains just SYN or FIN (begin & end of TCP connection)Seq number of the sender will increment by 1 after the Ack of reception. 6

13. TCP CONNECTION INITIATION HOST A HOST BNETWORK 7

14. TCP CONNECTION INITIATION HOST A HOST BNETWORK A sends to B: SYN Seq=ISN* =x , Ack=0 7

15. TCP CONNECTION INITIATION HOST A HOST BNETWORK A sends to B: SYN Seq=ISN* =x , Ack=0 *ISN is the initial sequence number: A random value chosen in the beginning of TCP connection as sequence number. 7

19. TCP CONNECTION INITIATION HOST A HOST BNETWORK A sends to B: SYN Seq=ISN* =x , Ack=0 B receives A’s SYN (B: Ack ++) *ISN is the initial sequence number: A random value chosen in the beginning of TCP connection as sequence number. 7

20. TCP CONNECTION INITIATION HOST A HOST BNETWORK A sends to B: SYN Seq=ISN* =x , Ack=0 B receives A’s SYN (B: Ack ++) B sends to A: SYN/Ack Seq=ISN(B) =y, Ack=0+1 *ISN is the initial sequence number: A random value chosen in the beginning of TCP connection as sequence number. 7

21. TCP CONNECTION INITIATION HOST A HOST BNETWORK A sends to B: SYN Seq=ISN* =x , Ack=0 B receives A’s SYN (B: Ack ++) B sends to A: SYN/Ack Seq=ISN(B) =y, Ack=0+1 *ISN is the initial sequence number: A random value chosen in the beginning of TCP connection as sequence number. 7

22. TCP CONNECTION INITIATION HOST A HOST BNETWORK y Ack=1 SYN A sends to B: SYN Seq=ISN* =x , Ack=0 B receives A’s SYN (B: Ack ++) B sends to A: SYN/Ack Seq=ISN(B) =y, Ack=0+1 *ISN is the initial sequence number: A random value chosen in the beginning of TCP connection as sequence number. 7

23. TCP CONNECTION INITIATION HOST A HOST BNETWORK y Ack=1 SYN A sends to B: SYN Seq=ISN* =x , Ack=0 B receives A’s SYN (B: Ack ++) B sends to A: SYN/Ack Seq=ISN(B) =y, Ack=0+1 *ISN is the initial sequence number: A random value chosen in the beginning of TCP connection as sequence number. 7

24. TCP CONNECTION INITIATION HOST A HOST BNETWORK y Ack=1 SYN A sends to B: SYN Seq=ISN* =x , Ack=0 B receives A’s SYN (B: Ack ++) B sends to A: SYN/Ack Seq=ISN(B) =y, Ack=0+1 A receives B:SYN/Ack (A: Seq=+1 data Acked by B) *ISN is the initial sequence number: A random value chosen in the beginning of TCP connection as sequence number. 7

25. TCP CONNECTION INITIATION HOST A HOST BNETWORK y Ack=1 SYN A sends to B: SYN Seq=ISN* =x , Ack=0 B receives A’s SYN (B: Ack ++) B sends to A: SYN/Ack Seq=ISN(B) =y, Ack=0+1 A sends to B Seq=ISN(A) +1, Ack=1 (A received B’s SYN) A receives B:SYN/Ack (A: Seq=+1 data Acked by B) *ISN is the initial sequence number: A random value chosen in the beginning of TCP connection as sequence number. 7

29. TCP CONNECTION INITIATION HOST A HOST BNETWORK y Ack=1 SYN A sends to B: SYN Seq=ISN* =x , Ack=0 B receives A’s SYN (B: Ack ++) B sends to A: SYN/Ack Seq=ISN(B) =y, Ack=0+1 A sends to B Seq=ISN(A) +1, Ack=1 (A received B’s SYN) A receives B:SYN/Ack (A: Seq=+1 data Acked by B) B receives A’s Ack  TCP session established (B: Seq=+1 data Acked by A) *ISN is the initial sequence number: A random value chosen in the beginning of TCP connection as sequence number. 7

30. TCP TRAFFIC DURING ESTABLICHED SESSION HOST A HOST BNETWORK 8

31. TCP TRAFFIC DURING ESTABLICHED SESSION HOST A HOST BNETWORK A sends to B: 100 Φ Seq=x’ , Ack=0 8

35. TCP TRAFFIC DURING ESTABLICHED SESSION HOST A HOST BNETWORK A sends to B: 100 Φ Seq=x’ , Ack=0 B receives A’s data 100 Φ 8

36. TCP TRAFFIC DURING ESTABLICHED SESSION HOST A HOST BNETWORK A sends to B: 100 Φ Seq=x’ , Ack=0 B receives A’s data 100 Φ B sends Ack to A Seq(B)=y’ ( the B’s SYN acked by A), Ack=x’+100 total data received from A 8

37. TCP TRAFFIC DURING ESTABLICHED SESSION HOST A HOST BNETWORK A sends to B: 100 Φ Seq=x’ , Ack=0 B receives A’s data 100 Φ B sends Ack to A Seq(B)=y’ ( the B’s SYN acked by A), Ack=x’+100 total data received from A 8

38. TCP TRAFFIC DURING ESTABLICHED SESSION HOST A HOST BNETWORK y’ Ack=x’+ 100 A sends to B: 100 Φ Seq=x’ , Ack=0 B receives A’s data 100 Φ B sends Ack to A Seq(B)=y’ ( the B’s SYN acked by A), Ack=x’+100 total data received from A 8

39. TCP TRAFFIC DURING ESTABLICHED SESSION HOST A HOST BNETWORK y’ Ack=x’+ 100 A sends to B: 100 Φ Seq=x’ , Ack=0 B receives A’s data 100 Φ B sends Ack to A Seq(B)=y’ ( the B’s SYN acked by A), Ack=x’+100 total data received from A 8

40. TCP TRAFFIC DURING ESTABLICHED SESSION HOST A HOST BNETWORK y’ Ack=x’+ 100 A sends to B: 100 Φ Seq=x’ , Ack=0 B receives A’s data 100 Φ B sends Ack to A Seq(B)=y’ ( the B’s SYN acked by A), Ack=x’+100 total data received from A A receives B’s Ack (A increments its seq by 100) 8

41. TCP TRAFFIC DURING ESTABLICHED SESSION HOST A HOST BNETWORK y’ Ack=x’+ 100 A sends to B: 100 Φ Seq=x’ , Ack=0 B receives A’s data 100 Φ B sends Ack to A Seq(B)=y’ ( the B’s SYN acked by A), Ack=x’+100 total data received from A A sends to B 250 Φ Seq=x’+100 Ack=1 (A same ack since B didn’t send any data) A receives B’s Ack (A increments its seq by 100) 8

45. TCP TRAFFIC DURING ESTABLICHED SESSION HOST A HOST BNETWORK y’ Ack=x’+ 100 A sends to B: 100 Φ Seq=x’ , Ack=0 B receives A’s data 100 Φ B sends Ack to A Seq(B)=y’ ( the B’s SYN acked by A), Ack=x’+100 total data received from A A sends to B 250 Φ Seq=x’+100 Ack=1 (A same ack since B didn’t send any data) B receives A’s data (B: Seq the same data Acked by A) A receives B’s Ack (A increments its seq by 100) 8

46. TCP CLOSING CONNECTION 9

47. TCP CLOSING CONNECTION A sends to B: FIN Seq=x, Ack=i last data received from B 9

51. TCP CLOSING CONNECTION A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) 9

52. TCP CLOSING CONNECTION A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN 9

53. TCP CLOSING CONNECTION A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN 9

54. TCP CLOSING CONNECTION y+ i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN 9

55. TCP CLOSING CONNECTION y+ i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN 9

56. TCP CLOSING CONNECTION y+ i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN 9

57. TCP CLOSING CONNECTION y+ i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN B sends to A: FIN Seq=y+i, Ack=x+1 last data received from A 9

58. TCP CLOSING CONNECTION y+ i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN B sends to A: FIN Seq=y+i, Ack=x+1 last data received from A 9

59. TCP CLOSING CONNECTION y+ i Ack=x+1 y+i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN B sends to A: FIN Seq=y+i, Ack=x+1 last data received from A 9

60. TCP CLOSING CONNECTION y+ i Ack=x+1 y+i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN B sends to A: FIN Seq=y+i, Ack=x+1 last data received from A 9

61. TCP CLOSING CONNECTION y+ i Ack=x+1 y+i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN B sends to A: FIN Seq=y+i, Ack=x+1 last data received from A A receives B’s FIN 9

62. TCP CLOSING CONNECTION y+ i Ack=x+1 y+i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN B sends to A: FIN Seq=y+i, Ack=x+1 last data received from A A receives B’s FIN A sends Ack to B Seq(A)=x+1 ( the 1 FIN acked by B), Ack=y+i+1 data received from A and FIN 9

63. TCP CLOSING CONNECTION y+ i Ack=x+1 y+i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN B sends to A: FIN Seq=y+i, Ack=x+1 last data received from A A receives B’s FIN A sends Ack to B Seq(A)=x+1 ( the 1 FIN acked by B), Ack=y+i+1 data received from A and FIN 9

64. TCP CLOSING CONNECTION y+ i Ack=x+1 y+i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN x+1 Ack=y+i +1 B sends to A: FIN Seq=y+i, Ack=x+1 last data received from A A receives B’s FIN A sends Ack to B Seq(A)=x+1 ( the 1 FIN acked by B), Ack=y+i+1 data received from A and FIN 9

65. TCP CLOSING CONNECTION y+ i Ack=x+1 y+i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN x+1 Ack=y+i +1 B sends to A: FIN Seq=y+i, Ack=x+1 last data received from A A receives B’s FIN A sends Ack to B Seq(A)=x+1 ( the 1 FIN acked by B), Ack=y+i+1 data received from A and FIN 9

66. TCP CLOSING CONNECTION y+ i Ack=x+1 y+i Ack=x+1 A sends to B: FIN Seq=x, Ack=i last data received from B B receives A’s FIN (A: Ack the recep of i data sent by B) B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=x+1 data received from A and FIN A receives B’s Ack FIN x+1 Ack=y+i +1 B sends Ack to A Seq(B)=y+i ( the i data acked by A), Ack=100 data received from A B sends to A: FIN Seq=y+i, Ack=x+1 last data received from A A receives B’s FIN A sends Ack to B Seq(A)=x+1 ( the 1 FIN acked by B), Ack=y+i+1 data received from A and FIN 9

67. Multi-path TCP MPTCP  Multi path TCP is a protocol that help end hosts to benefit from multiple TCP connections simultaneously. HOSTA HOSTB Address A1 Address A2 Address B1 Address B2 NETWORK 10

68. Multi-path TCP MPTCP  Multi path TCP is a protocol that help end hosts to benefit from multiple TCP connections simultaneously. HOSTA HOSTB Address A1 Address A2 Address B1 Address B2 NETWORK TCP subflow (I) 10

69. Multi-path TCP MPTCP  Multi path TCP is a protocol that help end hosts to benefit from multiple TCP connections simultaneously. HOSTA HOSTB Address A1 Address A2 Address B1 Address B2 NETWORK TCP subflow (I) TCP subflow (II) 10

70. MTCP PROTOCOL STACK 11

71. MTCP PROTOCOL STACK Physical 11

72. MTCP PROTOCOL STACK Physical Physical 11

73. MTCP PROTOCOL STACK LINK Physical Physical 11

74. MTCP PROTOCOL STACK LINK Physical LINK Physical 11

75. MTCP PROTOCOL STACK LINK Physical IP 2 LINK Physical 11

76. MTCP PROTOCOL STACK IP 1 LINK Physical IP 2 LINK Physical 11

77. MTCP PROTOCOL STACK IP 1 LINK Physical IP 2 LINK Physical TCP Subflow 11

78. MTCP PROTOCOL STACK IP 1 LINK Physical TCP Subflow IP 2 LINK Physical TCP Subflow 11

79. MTCP PROTOCOL STACK IP 1 LINK Physical MPTCP TCP Subflow IP 2 LINK Physical TCP Subflow 11

80. MTCP PROTOCOL STACK IP 1 LINK Physical TRANSPORT MPTCP TCP Subflow IP 2 LINK Physical TCP Subflow 11

81. MTCP PROTOCOL STACK IP 1 LINK Physical TRANSPORT MPTCP TCP Subflow IP 2 LINK Physical TCP Subflow 11

82. MTCP PROTOCOL STACK IP 1 APPLICATION LINK Physical TRANSPORT MPTCP TCP Subflow IP 2 LINK Physical TCP Subflow 11

83. MPTCP simple scenario HOST A HOST B Address A1 Address A2 Address B1 Address B2 Initial connection setup Additional subflow setup 12

84. INITIAL CONNECTION SETUP MP_CAPABLE Subtype  In the first TCP sub-flow connection establishment, both hosts must declare that they support MPTCP.  In this declaration they negotiate the encryption and exchange thier keys.  These information are carried over MPTCP_capable signal. 13

85. INITIAL CONNECTION SETUP MP_CAPABLE Subtype  In the first TCP sub-flow connection establishment, both hosts must declare that they support MPTCP.  In this declaration they negotiate the encryption and exchange thier keys.  These information are carried over MPTCP_capable signal. Kind Length Subtype Version A|B|C|D|E| F|G|H Option Sender’s Key (64 bits) Option Receiver’s Key (64 bits) 13

86. INITIAL CONNECTION SETUP MP_CAPABLE Subtype  In the first TCP sub-flow connection establishment, both hosts must declare that they support MPTCP.  In this declaration they negotiate the encryption and exchange thier keys.  These information are carried over MPTCP_capable signal. Kind Length Subtype Version A|B|C|D|E| F|G|H Option Sender’s Key (64 bits) Option Receiver’s Key (64 bits) MP_CAPABLE HEADER 13

87. INITIAL CONNECTION SETUP HOST A HOST BNETWORK Address A1 Address B1 14

88. INITIAL CONNECTION SETUP HOST A HOST BNETWORK TCP: A sends to B SYN MPTCP: capable + A’s key Address A1 Address B1 14

89. INITIAL CONNECTION SETUP HOST A HOST BNETWORK TCP: A sends to B SYN MPTCP: capable + A’s key Address A1 Address B1 14

90. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) TCP: A sends to B SYN MPTCP: capable + A’s key Address A1 Address B1 14

91. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) TCP: A sends to B SYN MPTCP: capable + A’s key Address A1 Address B1 14

92. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable Address A1 Address B1 14

93. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable B sends to A: SYN/Ack MPTCP: capable + B’s key Address A1 Address B1 14

94. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable B sends to A: SYN/Ack MPTCP: capable + B’s key Address A1 Address B1 14

95. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) SYN // ACK MP_CAPABLE (B_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable B sends to A: SYN/Ack MPTCP: capable + B’s key Address A1 Address B1 14

96. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) SYN // ACK MP_CAPABLE (B_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable B sends to A: SYN/Ack MPTCP: capable + B’s key Address A1 Address B1 14

97. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) SYN // ACK MP_CAPABLE (B_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable B sends to A: SYN/Ack MPTCP: capable + B’s key A receives B:SYN/Ack MPTCP: A is aware that B is MPTCP capable Address A1 Address B1 14

98. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) SYN // ACK MP_CAPABLE (B_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable B sends to A: SYN/Ack MPTCP: capable + B’s key A sends to B Ack MPTCP: capable :: A’s key + B’s key A receives B:SYN/Ack MPTCP: A is aware that B is MPTCP capable Address A1 Address B1 14

99. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) SYN // ACK MP_CAPABLE (B_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable B sends to A: SYN/Ack MPTCP: capable + B’s key A sends to B Ack MPTCP: capable :: A’s key + B’s key A receives B:SYN/Ack MPTCP: A is aware that B is MPTCP capable Address A1 Address B1 14

100. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) SYN // ACK MP_CAPABLE (B_key) Ack MP_CAPABLE (A_key, B_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable B sends to A: SYN/Ack MPTCP: capable + B’s key A sends to B Ack MPTCP: capable :: A’s key + B’s key A receives B:SYN/Ack MPTCP: A is aware that B is MPTCP capable Address A1 Address B1 14

101. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) SYN // ACK MP_CAPABLE (B_key) Ack MP_CAPABLE (A_key, B_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable B sends to A: SYN/Ack MPTCP: capable + B’s key A sends to B Ack MPTCP: capable :: A’s key + B’s key A receives B:SYN/Ack MPTCP: A is aware that B is MPTCP capable Address A1 Address B1 14

102. INITIAL CONNECTION SETUP HOST A HOST BNETWORK SYN MP_CAPABLE (A_key) SYN // ACK MP_CAPABLE (B_key) Ack MP_CAPABLE (A_key, B_key) TCP: A sends to B SYN MPTCP: capable + A’s key B receives A’s SYN MPTCP: B is aware that A is MPTCP capable B sends to A: SYN/Ack MPTCP: capable + B’s key A sends to B Ack MPTCP: capable :: A’s key + B’s key A receives B:SYN/Ack MPTCP: A is aware that B is MPTCP capable TCP connection  ok B and A are MPTCP CAPABLE Address A1 Address B1 14

103. Additional subflow setup Methode 1  There are tow methode to add new subflow  I) send direct MP_Joint Msg from host A to B.  In which it identify it self (authentication negotiated in the MP_Capable previously)  And declare its new joinable ip with IP_ID ( to avoide middel box NAT MPTCP declare ip with IP_ID this information is send on MPTCP header ) 15

104. Additional subflow setup Methode 1  There are tow methode to add new subflow  I) send direct MP_Joint Msg from host A to B.  In which it identify it self (authentication negotiated in the MP_Capable previously)  And declare its new joinable ip with IP_ID ( to avoide middel box NAT MPTCP declare ip with IP_ID this information is send on MPTCP header ) Kind Length Subtype |B| Address ID Receiver’s Token (32 bits) Sender’s Random Number (32 bits) 15

105. Additional subflow setup Methode 1  I) send direct MP_Joint Msg from host A to B.  In which it identify it self (authentication negotiated in the MP_Capable previously)  And declare its new joinable ip with IP_ID ( to avoide middel box NAT MPTCP declare ip with IP_ID this information is send on MPTCP header ) Kind Length Subtype |B| Address ID Receiver’s Token (32 bits) Sender’s Random Number (32 bits) 15

106. Additional subflow setup Methode 1  In which it identify it self (authentication negotiated in the MP_Capable previously)  And declare its new joinable ip with IP_ID ( to avoide middel box NAT MPTCP declare ip with IP_ID this information is send on MPTCP header ) Kind Length Subtype |B| Address ID Receiver’s Token (32 bits) Sender’s Random Number (32 bits) 15

107. Additional subflow setup Methode 1  And declare its new joinable ip with IP_ID ( to avoide middel box NAT MPTCP declare ip with IP_ID this information is send on MPTCP header ) Kind Length Subtype |B| Address ID Receiver’s Token (32 bits) Sender’s Random Number (32 bits) 15

108. Additional subflow setup Methode 1 Kind Length Subtype |B| Address ID Receiver’s Token (32 bits) Sender’s Random Number (32 bits) 15

109. Additional subflow setup Methode 1 Kind Length Subtype |B| Address ID Receiver’s Token (32 bits) Sender’s Random Number (32 bits) MP_JOIN Header 15

110. Additional subflow setup HOST A HOST B Address B1Address A2 16

111. Additional subflow setup HOST A HOST B TCP: A sends to B: SYN MPTCP: MP_JOINT Address B1Address A2 16

112. Additional subflow setup HOST A HOST B TCP: A sends to B: SYN MPTCP: MP_JOINT Address B1Address A2 16

113. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) TCP: A sends to B: SYN MPTCP: MP_JOINT Address B1Address A2 16

114. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) TCP: A sends to B: SYN MPTCP: MP_JOINT Address B1Address A2 16

115. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN Address B1Address A2 16

116. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN Address B1Address A2 16

117. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN Address B1Address A2 16

118. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN Address B1Address A2 16

119. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN Address B1Address A2 16

120. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A receives B:SYN/Ack MP_JOIN Address B1Address A2 16

121. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A receives B:SYN/Ack MP_JOIN Address B1Address A2 TCP: A sends to B: SYN MPTCP: MP_JOINT 16

122. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A receives B:SYN/Ack MP_JOIN Address B1Address A2 TCP: A sends to B: SYN MPTCP: MP_JOINT 16

123. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A receives B:SYN/Ack MP_JOIN Address B1Address A2 TCP: A sends to B: SYN MPTCP: MP_JOINT 16

124. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A receives B:SYN/Ack MP_JOIN Address B1Address A2 TCP: A sends to B: SYN MPTCP: MP_JOINT 16

125. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A receives B:SYN/Ack MP_JOIN Address B1Address A2 TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN 16

126. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A receives B:SYN/Ack MP_JOIN B receives A’s Ack  TCP session established (B: Seq=+1 data Acked by A) Address B1Address A2 TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN 16

127. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A receives B:SYN/Ack MP_JOIN B receives A’s Ack  TCP session established (B: Seq=+1 data Acked by A) Address B1Address A2 TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN 16

128. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A receives B:SYN/Ack MP_JOIN B receives A’s Ack  TCP session established (B: Seq=+1 data Acked by A) Address B1Address A2 Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN 16

129. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A receives B:SYN/Ack MP_JOIN B receives A’s Ack  TCP session established (B: Seq=+1 data Acked by A) Address B1Address A2 Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN 16

130. Additional subflow setup HOST A HOST B MP_JOIN (B_Token, random_num) SYN // MP_JOIN (A_HMAC,random_ num) Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN B sends to A: SYN/Ack MP_JOIN A sends to B Seq=ISN(A) +1, Ack=1 (A received B’s SYN) A receives B:SYN/Ack MP_JOIN B receives A’s Ack  TCP session established (B: Seq=+1 data Acked by A) Address B1Address A2 Ack MP_JOIN (A_key, B_key) TCP: A sends to B: SYN MPTCP: MP_JOINT B receives A’s SYN & MP_JOIN 16

131. Additional subflow setup Methode 2 (box)  II) In case the second host is behind firewall or middel box that forbid external TCP connection to be establiched.  Or if host A want to let host B chose when to start the new connection ( if B is a busy server that handel many other connections )  In the establiched connection host A sends to B an MPTCP ADD_ADDR signal  ADD_ADDR contains ip address A2 (ipv4 or 6)(ip @ of second int), the address ID associated to this ip @, port* • *Port: the TCP port in wich the host A expect to start the new MPTCP subflow. Generally, it is the same port as the first TCP flow (it can be set to a new one) 17

132. Additional subflow setup Methode 2 (box)  Or if host A want to let host B chose when to start the new connection ( if B is a busy server that handel many other connections )  In the establiched connection host A sends to B an MPTCP ADD_ADDR signal  ADD_ADDR contains ip address A2 (ipv4 or 6)(ip @ of second int), the address ID associated to this ip @, port* • *Port: the TCP port in wich the host A expect to start the new MPTCP subflow. Generally, it is the same port as the first TCP flow (it can be set to a new one) 17

133. Additional subflow setup Methode 2 (box)  In the establiched connection host A sends to B an MPTCP ADD_ADDR signal  ADD_ADDR contains ip address A2 (ipv4 or 6)(ip @ of second int), the address ID associated to this ip @, port* • *Port: the TCP port in wich the host A expect to start the new MPTCP subflow. Generally, it is the same port as the first TCP flow (it can be set to a new one) 17

134. Additional subflow setup Methode 2 (box)  ADD_ADDR contains ip address A2 (ipv4 or 6)(ip @ of second int), the address ID associated to this ip @, port* • *Port: the TCP port in wich the host A expect to start the new MPTCP subflow. Generally, it is the same port as the first TCP flow (it can be set to a new one) 17

135. Additional subflow setup Methode 2 (box) • *Port: the TCP port in wich the host A expect to start the new MPTCP subflow. Generally, it is the same port as the first TCP flow (it can be set to a new one) 17

136. Additional subflow setup Methode 2 (box) 17

137. Additional subflow setup Methode 2 (box) Add Address option 17

138. Additional subflow setup Methode 2 (box) Kind Length Subtype Address ID Address (IPv4 / v6 :? IPver) Port IPVer Add Address option 17

139. Additional subflow setup Methode 2 (box)  After recieving ADD_ADDR B can establish new TCP connect win MP_JOIN as described before (MP_JOIN). HOSTA HOSTB Addr A1 Addr A2 Addr B1 Addr B2 Established TCP connection MPTCP ADD_ADDR option [addr A2 , addr ID A2, port*] TCP 18

140. Additional subflow setup Methode 2 (box)  After recieving ADD_ADDR B can establish new TCP connect win MP_JOIN as described before (MP_JOIN). HOSTA HOSTB Addr A1 Addr A2 Addr B1 Addr B2 New TCP connection Established TCP connection MPTCP ADD_ADDR option [addr A2 , addr ID A2, port*] TCP 18

143. Additional subflow setup Methode 2 (box)  After recieving ADD_ADDR B can establish new TCP connect win MP_JOIN as described before (MP_JOIN). HOSTA HOSTB Addr A1 Addr A2 Addr B1 Addr B2 New TCP connection Established TCP connection MPTCP ADD_ADDR option [addr A2 , addr ID A2, port*] TCP New TCP connect 18

146. Additional subflow setup Methode 2 (box)  After recieving ADD_ADDR B can establish new TCP connect win MP_JOIN as described before (MP_JOIN). HOSTA HOSTB Addr A1 Addr A2 Addr B1 Addr B2 New TCP connection Established TCP connection MPTCP ADD_ADDR option [addr A2 , addr ID A2, port*] TCP New TCP connect New TCP connect 18

147. DATA MAPPING TCP connection HOSTA HOSTB 19

148. DATA MAPPING TCP connection HOSTA HOSTB Data 11 19

152. DATA MAPPING TCP connection HOSTA HOSTB Data 11 Data 12 19

153. DATA MAPPING TCP connection HOSTA HOSTB Data 11 Data 12 19

154. DATA MAPPING TCP connection HOSTA HOSTB Data 11 Data 12 Data 13 19

161. DATA MAPPING TCP connection HOSTA HOSTB Data 11 Data 12 Data 13 Data 14 19

167. DATA MAPPING TCP connection HOSTA HOSTB Data 11 Data 12 Data 13 Data 14 TCP sequence reorder 19

174. DATA MAPPING TCP connection HOSTA HOSTB Data 12 Data 13 Data 14 All data received to seq 14  Send Ack 14 19

175. DATA MAPPING TCP connection HOSTA HOSTB Data 13 Data 14 All data received to seq 14  Send Ack 14 19

176. DATA MAPPING TCP connection HOSTA HOSTB Data 14 All data received to seq 14  Send Ack 14 19

177. DATA MAPPING TCP connection HOSTA HOSTB All data received to seq 14  Send Ack 14 19

178. DATA MAPPING TCP connection HOSTA HOSTB All data received to seq 14  Send Ack 14 Ack 14 19

181. DATA MAPPING TCP connection HOSTA HOSTB All data received to seq 14  Send Ack 14 19

182. Data Sequence Signal:DSS  Data sequence signal option:  Contains DATA Mapping information { data sequence number, subflow sequence number, data level length}  It can be used for DATA_ACK  It can be used for DATA_FIN 20

183. Data Sequence Signal:DSS  Data sequence signal option:  Contains DATA Mapping information { data sequence number, subflow sequence number, data level length}  It can be used for DATA_ACK  It can be used for DATA_FIN Data-Level Length Kind Length Subtype (reserved)|F|m|M|a|A Data ACK DATA sequence number {DSN} Subflow Sequence Number Checksum 20

184. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII 21

185. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Data 11 21

186. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowIIData 11 21

187. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number Data 11 21

188. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number 21

189. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number DSN 11 21

190. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number DSN 11 21

191. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number DSN 11 Data 12 21

192. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number DSN 11 Data 12 21

193. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number DSN 11 Data 12 Data 13 21

194. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number DSN 11 Data 12 Data 13 21

195. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number DSN 11Data 13 21

196. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number DSN 11Data 13 21

197. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number DSN 11 DSN 12 Data 13 21

198. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII Encapsulation MPTCP: Data Seq Number DSN 11 DSN 12 Data 13 21

199. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowIIDSN 11 DSN 12 Data 13 21

200. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowIIDSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number Data 13 21

201. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowIIDSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number Seq 101 Data 13 21

202. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowIIDSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number Seq 101 Seq 313 Data 13 21

203. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowIIDSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number Seq 101 Seq 313 Data 13 21

204. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowIIDSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number Seq 101 Seq 313 TCP subflow (I) recieved seq*: Data 13 21

205. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowIIDSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number Seq 101 Seq 313 TCP subflow (I) recieved seq*: 101 Data 13 21

206. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowIIDSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number Seq 313 TCP subflow (I) recieved seq*: 101 Data 13 21

209. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number Seq 313 TCP subflow (I) recieved seq*: 101 Data 13 21

210. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number Seq 313 TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*:Data 13 21

211. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number Seq 313 TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313Data 13 21

212. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313Data 13 21

215. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 21

216. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313DSN 13 21

217. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313DSN 13 21

218. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313DSN 13 Data 14 21

219. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313DSN 13Data 14 21

220. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313DSN 13Data 14 Data 15 21

221. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313DSN 13Data 14 Data 15 21

222. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313DSN 13 Data 15 21

223. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313DSN 13DSN 14 Data 15 21

224. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 Seq 314 DSN 13DSN 14 Data 15 21

225. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 Seq 314 DSN 13DSN 14 Data 15 21

226. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 Seq 314 DSN 13DSN 14 314 Data 15 21

227. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313DSN 13DSN 14 314 Data 15 21

228. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313DSN 13DSN 14 314 Data 15 21

229. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 14 314 Data 15 21

230. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 14 314 21

231. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 21

232. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 21

233. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 Seq 102 DSN 13 DSN 15 DSN 14 314 21

234. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 Seq 102 DSN 13 DSN 15 DSN 14 314 21

235. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 Seq 102 DSN 13 DSN 15 DSN 14 314 102 21

236. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 21

242. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 Seq 315 DSN 13 DSN 15 DSN 14 314 102 315 21

243. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 315 21

246. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 315 Ack 102 21

248. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 315 Ack 102 Ack 315 21

249. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 315 Ack 102 Ack 315 21

255. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15DSN 14 314 102 315 21

258. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB DATA sequence reorder Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 315 21

259. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB DATA sequence reorder Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 315 DATA_Ack 15 21

260. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB DATA sequence reorder Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 315 DATA_Ack 15 21

261. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB DATA sequence reorder Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 315 21

262. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB DATA sequence reorder All data received to DATA_Seq 15  Send DATA_Ack 15 Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 315 21

263. DATA MAPPING MPTCP connection with Multiple subflows HOSTA HOSTB DATA sequence reorder All data received to DATA_Seq 15  Send DATA_Ack 15 Application App1 TCP sub flowI TCP sub flowII DSN 11 DSN 12 Encapsulation TCP: Subflow Seq Number TCP subflow (I) recieved seq*: 101 TCP subflow (II) recieved seq*: 313 DSN 13 DSN 15 DSN 14 314 102 315 21

264. Closing MPTCP connection  MPTCP connection ends when when both hosts have no data to be send.  MPTCP data finalisation is independant of TCP traffic on each subflow  host can close an TCP subflow ( with normal TCP FIN ) but continue transmitting on other subflows.  When host has no more data to send it sends Data Sequence Signal DATA_FIN ( DSS ) on one of its subflow  Then it waits for the reciever to send back a Data Sequence Signal DATA_ACK ( Similar to TCP FIN)  When both hosts close their MPTCP connection they terminate all TCP subflow ( with FIN mecanism on each one ) 22

265. Closing MPTCP connection HOST A HOST B TCP Subflow DSS=DATA_FIN TCP Subflow DSS=DATA_ACK TCP Subflow DSS=DATA_FIN Host A has no more DATA to send MPTCP: DSS=DATA_FIN B receives A’s DATA_FIN B sends to A: DATA_ACKA receives B:DATA_ACK A conncetion is terminated Address B1Address A2 TCP Subflow DSS=DATA_ACK Host B has no more DATA to send MPTCP: DATA_FIN A receives B’s DATA_FIN A sends to B: DATA_ACK B receives A:DATA_ACK B conncetion is terminated 23

266. THANK YOU  24

TCP to MPTCP Brief Explanation

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