u Includes header u Limits total packet to 64K u Redundant 13 CSE 123 Lecture 9

U includes header u limits total packet to 64k u

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u Includes header u Limits total packet to 64K u Redundant? 13 CSE 123 – Lecture 9: Internetworking
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Fragmentation Different networks may have different maximum frame sizes u Maximum Transmission Unit (MTUs) u Ethernet 1.5K, FDDI 4.5K Router breaks up single IP packet into two or more smaller IP packets u Each fragment is labeled so it can be correctly reassembled u End host reassembles them into original packet R1 H4 H5 H3 H2 H1 Network 2 (Ethernet) H6 Network 3 (FDDI) Fragment? 14 CSE 123 – Lecture 9: Internetworking
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IP ID and Bitflags Source inserts unique value in identification field u Also known as the IPID u If packet is fragmented, the router copies this value into any fragments Offset field indicates position of current fragment (in bytes/8) u Zero for non-fragmented packet 15 Bitflags provide additional information u More Fragments bit helps identify last fragment u Don’t Fragment bit prohibits (further) fragmentation u Note recursive fragmentation easily supported—just requires care with More Fragments bit CSE 123 – Lecture 9: Internetworking
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For Next Time Keep reading 3.2 in P&D Keep plugging away on Project 1 16 CSE 123 – Lecture 9: Internetworking
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  • Fall '08
  • Varghese,G

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