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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

Reset function

- Chuyn v trng thi Listen nuang trng thi SYN-RECEIVED- Chuyn v trng thi CLOSE vi cctrng hp khc

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

Transmission Control Block

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

- Khi to gi tr SYN (ISN Initial Sequence Number): tng 1 n vsau 4 microsecond

- MSS (Maximum Segment Size): gi khi khi to kt ni; mc nh= 536

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

MSL=120s

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

Qun l thng tin ti Sender/Receiver

-Ca s gi: 4 nhm

- Ca s nhn: 3 nhm

- Con tr gi (sender pointer)

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

-Con tr nhn (receiver pointer)

- SND.UNA= SQ

- RCV.NXT=ACK

- SND.WND=REV.WND=Window

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

-Client:

-SQ=0;

- Receive Windows size = 200

- Server:

-SQ=240

-Receive Windows size = 360

- MSS: 536

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

-Client gi yu cu ti server (140 byte)

-Pha client cha c data gi thm. Server nhn c yu cu v gi 80byte ti client

- Client nhn c 80 byte chnh xc v ACK cho server. Server c nhu cugi 280 byte ti client. Tuy nhin n ch c php gi 120 byte

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

-Client nhn d liu t server v ACK. Serverc lp trnh khng gi dliu nh hn 100 byte.

- Server nhn c ACK.

- Server gi 160 byte cn li.

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

-Client nhn d liu t server v ACK

- Server nhn ACK v kt thc truyn

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

- Retransmission Queue

- Resend segment

- Retransmit only time out segment

- Retransmit all outstanding segment

-SACK

-Timer? Adaptive retransmission

-New RTT=( *old RTT+ ((1- ) Newest RTT Measurement)

-Karn Algorithm

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

- Window size v Flow Control

- Gim ca s gim tc truyn

- Gim ca s dng truyn d liu mi

- ng ca s gi

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

- TCP window management

-Shrinking TCP Window

- Gi bn tin thm d (probe segment) khi ca s ng

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

- TCP Silly window syndrome - SWS

-Khc phc:

-Receiver SWS avoidance

-Sender SWS avoidance (Nagles Algorithm)

-Khng c bn tin cha c ACK hoc ng dng yu cu-> truynngay

- Cn bn tin cha c ACK -> chtruyn khi nhn c ACKhoc b m pht =MSS

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Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

Hanoi University of Technology Faculty of Electronics and Telecommunications

8/2009 TCP/IP

- TCP Congestion

- Slow Start

- Congestion Avoidance

- Fast Retransmit

- Fast Recovery