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CSE398: Network Systems Design Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Lehigh University February 14, 2005

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Instructor: Dr. Liang Cheng CSE398: Network Systems Design 02/14/05 Outline ± Recap ± Why “do not fragment”? Some concepts. ± Packet processing algorithms (Chapter 5) ± Packet processing algorithms ± Summary and homework
Instructor: Dr. Liang Cheng CSE398: Network Systems Design 02/14/05 MTU ± Maximum transmission unit ± The maximum amount of data that a link- layer frame can carry. For example, Ethernet frames can carry up to 1,500 bytes of data. [From Jim Kurose’s textbook, pp. 328] ± MTU is the largest IP datagram that it can carry in a frame. [Larry Peterson’s textbook, pp. 242]

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Instructor: Dr. Liang Cheng CSE398: Network Systems Design 02/14/05 MSS ± Maximum segment size ± The maximum amount of data that can be placed in a TCP segment. [From Jim Kurose’s textbook, pp. 230]
Instructor: Dr. Liang Cheng CSE398: Network Systems Design 02/14/05 Fragmentation H1 R1 R2 R3 H8 ETH IP (1400) FDDI IP (1400) PPP IP (512) PPP IP (376) PPP IP (512) ETH IP (512) ETH IP (376) ETH IP (512) Ident = x Offset = 0 Start of header 0 Rest of header 1400 data bytes Ident = x Offset = 0 Start of header 1 Rest of header 512 data bytes Ident = x Offset = 64 Start of header 1 Rest of header 512 data bytes Ident = x Offset = 128 Start of header 0 Rest of header 376 data bytes ± Offset specifies 8-byte chucks of data rather than individual bytes

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