Transport Layer - Freie Universität Berlin

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Transport Protocol: Connection Establishment ● Problems with connection establishment ● When network can lose, store, and duplicate packets ● Delayed duplicates ● Solution approaches ● Throw-away TSAPs: For each connection a new TSAP is used ● Management of used TSAPs ● Restrict packet life time, e.g., by a TTL field, timestamp, … ● Solution of Tomlinson, Sunshine, and Dalal (Three-way Handshake) ● Each computer has a clock (time of day) ● Clocks do not need to be synchronized ● Clock has to run even when the computer crashes or is switched off ● Idea: Put sequence numbers into TPDUs and two TPDUs with the same sequence number may not outstand at the same time ● Each connection starts with a different initial sequence number Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 8: Transport Layer 8.14
Transport Protocol: Connection Establishment TPDUs may not enter the forbidden region Assumption: After T time units TPDU and Ack are dead and have no effect. Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 8: Transport Layer The resynchronization problem 8.15
Page 1 and 2: Telematics Chapter 8: Transport Lay
Page 3 and 4: Design Issues Univ.-Prof. Dr.-Ing.
Page 5 and 6: Services Provided to the Upper Laye
Page 7 and 8: Transport Service Primitives ● Pr
Page 9 and 10: Transport Service Primitives ● A
Page 11 and 12: Transport Protocol: Addressing ●
Page 13: Transport Protocol: Addressing ●
Page 17 and 18: Transport Protocol: Connection Rele
Page 19 and 20: Transport Protocol: Connection Rele
Page 21 and 22: Transport Protocol: Multiplexing
Page 23 and 24: Transport Protocol: Crash Recovery
Page 25 and 26: Transport Protocols in the TCP/IP R
Page 27 and 28: User Datagram Protocol (UDP) Univ.-
Page 29 and 30: UDP Header ● Source Port, Destina
Page 31 and 32: User Datagram Protocol (UDP) Socket
Page 33 and 34: Example: Java Client (UDP) import j
Page 35 and 36: Transmission Control Protocol (TCP)
Page 37 and 38: TCP as a Reliable Connection If the
Page 39 and 40: TCP: Overview RFCs: 793, 1122, 1323
Page 41 and 42: Socket Programming in TCP Server si
Page 43 and 44: Socket programming in TCP Server (o
Page 45 and 46: Example: Java Server (TCP) import j
Page 47 and 48: TCP-based Applications File transfe
Page 49 and 50: The TCP Header ● Source and Desti
Page 51 and 52: TCP Pseudo Header ● Checksum: ser
Page 53 and 54: TCP Connection Management: 1. Conne
Page 55 and 56: TCP Connection Management: 2. Data
Page 57 and 58: TCP Connection Management TCP clien
Page 59 and 60: States during a TCP Session State D
Page 61 and 62: Timer Management with TCP ● TCP u
Page 63 and 64: Timer Management with TCP: Example
Page 65 and 66:
Timer Management with TCP: Retransm
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Transmission Control Protocol (TCP)
Page 73 and 74:
TCP Sender Events ● Data received
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TCP Retransmission Scenarios SendBa
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TCP ACK generation [RFC 1122, RFC 2
Page 79 and 80:
TCP Flow Control: Sliding Window
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“Silly Window” Syndrome Header
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Flow Control: Network Bottlenecks C
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Principles of Congestion Control
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Causes/costs of congestion: Scenari
Page 89 and 90:
Causes/costs of congestion: Scenari
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Approaches towards congestion contr
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Case study: ATM ABR congestion cont
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TCP congestion control: additive in
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TCP Slow Start ● When connection
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TCP Slow Start ● When connection
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Refinement: Inferring loss ● Afte
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Fast Retransmit Timeout Host A Time
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Fast Retransmit and Fast Recovery
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Summary: TCP Congestion Control ●
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Transmission Control Protocol (TCP)
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TCP Futures: TCP over “long, fat
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TCP Fairness ● Fairness goal: if
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Fairness (more) ● Fairness and UD
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TCP in Wireless Networks ● Theore
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TCP and Security: SYN-Flood ● Dur
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Some Tools Univ.-Prof. Dr.-Ing. Joc
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Some Tools ● TTCP - Test TCP ●
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Stream Control Transmission Protoco
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SCTP Multi-Homing ● Ability for a
Page 129 and 130:
SCTP Packet Format ● Common Heade
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SCTP Chunks ● Type (Examples) ●
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SCTP DATA Chunk ● Transmission Se
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Datagram Congestion Control Protoco
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DCCP vs. TCP/UDP ● Choice of cong
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DCCP Generic Header ● Ports ● 1
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DCCP State Diagram a la RFC +------
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Transport Layer - Freie Universität Berlin

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