TCP

Jul 13, 2012

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History of TCP/IP

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TCP

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1. TCP/IP Server Protocols version 05/25/2001

TCP

Configuring a firewall. Primary approach to configuring a firewallStudy serviceIP ADDRESSES PORTSSet up rules for allowing or denying access to the services you want utilized.Problem:Some of the issues are more subtle than IP/PORT. IP Basics. IP encapsulates TCPIP packets travel through many different routers (hops) before reaching it's destinationMTU variation at the physical layer requires IP to fragment the message into smaller units along the wayReassembly is an option at each hop.31646

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TCP

TCP/IP????Novell NetWare??. ??????IP?????IP???IPX?????IPX??. ??????. ???????????????????Internet Control Message Protocol. ??????. Transmission Control Protocol (TCP), ?RFC793???,??????:??????????????????. ??????????. ??????????,TCP?????????????TCP?????????,TCP?????????????????????????

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TCP

1971 - ALOHAnet, also known as ALOHA, was a radio-based pioneering computer networking system developed at the University of Hawaii.

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TCP

TCP. full duplex data: bi-directional data flow in same connection MSS: maximum segment size connection-oriented: handshaking (exchange of control msgs) init’s sender, receiver state before data exchange flow controlled: sender will not overwhelm receiver. point-to-point:

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TCP

TCP. Lecture 13 November 13, 2000. TCP Background. Transmission Control Protocol (TCP) TCP provides much of the functionality that IP lacks: reliable service. TCP Service. TCP provides the following functionality Connection Orientated Point-to-Point Communication Complete Reliability

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TCP

TCP. TCP flow/congestion control. Sometimes sender shouldn’t send a pkt whenever its ready Receiver not ready (e.g., buffers full) React to congestion Many unACK’ed pkts, may mean long end-end delays, congested networks Network itself may provide sender with congestion indication

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TCP

Overview of TCP/IP . US DoD funded experimental networksupports inter-networks, inter-host communicationmost popular UNIX networking protocolsThree basic protocolsTCP - a reliable session protocol: telnet, ftpUDP - low overhead sessionless: NFS, NIS, DNS, routingIP - Network layer

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TCP

TCP. TCP Adaptive Retransmission Algorithm - Original. Theory Estimate RTT Multiply by 2 to allow for variations Practice Use exponential moving average (A = 0.1 to 0.2) Estimate = (A) * measurement + (1- A) * estimate Problem Did not handle variations well

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TCP

TCP. EE 122, Fall 2013 Sylvia Ratnasamy http://inst.eecs.berkeley.edu/~ee122 / Material thanks to Ion Stoica , Scott Shenker , Jennifer Rexford, Nick McKeown , and many other colleagues. TCP Header. Source port. Destination port. Used to mux and demux. Sequence number.

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TCP

TCP. Transmission Control Protocol Part 1 CH 23 Aseel Alturki. In Comparison with UDP. TCP Services. Process-to-Process communication Stream Delivery Service:. TCP Services (Cont..). Stream Delivery Service (Cont..). TCP Services (Cont..).

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TCP

TCP. 10. TCP – purpose. TCP provides reliable data transmission over an unreliable network. TCP provides congestion control TCP provides flow control TCP passes messages Inputs Destination address Destination port Source port (socket) Message Outputs Message Error reporting

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TCP

EMTC t – thread f – fork s - slecet. UDP. TCP. TCP Connections.

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TCP

TCP. Contents. TCP TCP connection TCP flow control TCP congestion control TCP timer UDP. Transport Layer. End-to-end data transfer (cf) DLP(data link protocol) data transfer between adjacent nodes. DLP. DLP. DLP. DLP. DLP. Host. Host. Transport layer protocol.

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TCP

TCP. Reliable Transport in TCP TCP flow and Congestion Control. Learning objectives. TCP. Application. Application. byte stream. byte stream. segments. Transmitter. Receiver. Send buffer. Receive buffer. ACKs. TCP: Overview.

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TCP

TCP. TCP ACK generation [RFC 1122, RFC 2581]. TCP Receiver action Delayed ACK. Wait up to 500ms for next segment. If no next segment, send ACK Immediately send single cumulative ACK, ACKing both in-order segments Immediately send duplicate ACK, indicating seq. # of next expected byte

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TCP

TCP. section 6.5 (Read this section!) 27 Feb 2007. TCP. Transmission Control Protocol (RFC 793/and many more) Reliable, connection-based protocol byte stream max packet size: 64 KB (1460 bytes is often the practical limit). Tanenbaum, Figure 6-28, page 534. Socket Libraries (Unix/Linux).

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TCP

TCP. Transport Control Protocol Reliable In-order delivery Flow control Responds to congestion “Nice” Protocol. TCP Header. TCP flow control. Window based Sender cannot send more data than a window without acknowledgements.

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TCP

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TCP

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TCP

TCP. CSE 6590. 1. TCP. Services Flow control Connection establishment and termination Congestion control. 2. TCP Services. Transmission Control Protocol (RFC 793) connection oriented, reliable communication over reliable and unreliable (inter)networks two ways of labeling data:

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