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15-441 Computer Networking

15-441 Computer Networking

15-441 Computer Networking. Lecture 29 – Final Review. Fun. TCP/IP drinking game ( http://infohost.nmt.edu/~val/tcpip.html ) Internet map ( http://xkcd.com/c195.html ). Outline – Lec 14. The recurring IP address space problem IPv6. NAT. Tunneling / Overlays Network Management

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1.23k views • 102 slides
15-744 Computer Networking

15-744 Computer Networking

15-744 Computer Networking. Review 2 – Transport Protocols. Outline. Transport introduction Error recovery & flow control. Transport Protocols. Lowest level end-to-end protocol. Header generated by sender is interpreted only by the destination

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746 views • 64 slides
TCP continued

TCP continued

TCP continued. 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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272 views • 25 slides
TCP

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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380 views • 22 slides
Outline

Outline

TCP Congestion control Flow control. Outline. Congestion: informally: “too many sources sending too much data too fast for network to handle” manifestations: lost packets (buffer overflow at routers) long delays (queuing in router buffers). Principles of Congestion Control.

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180 views • 16 slides
TCP-BFA: Buffer Fill Avoidance

TCP-BFA: Buffer Fill Avoidance

TCP-BFA: Buffer Fill Avoidance. Amr A. Awadallah Chetan Rai Computer Systems Laboratory Stanford University. {aaa,crai}@stanford.edu http://klamath.stanford.edu/~aaa/tcp-bfa September 1998. TCP Congestion Avoidance. Disadvantages: 1. High Buffer Occupancies 2. High Delay

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277 views • 12 slides

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