Oct30 - CSE/ECE404: Computer Networks Instructor: Dr. Liang...

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CSE/ECE404: Computer Networks Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Lehigh University October 30, 2007
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 10/30/07 Outline ± Recap ± ICMP ± Link state routing ± Summary and homework
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 10/30/07 Flags for Fragmentation ± Bit 0: reserved, must be zero Bit 1: DF ± 0 = May Fragment, 1 = Don't Fragment ± Bit 2: MF ± 0 = Last Fragment, 1 = More Fragments
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 10/30/07 ICMP (Internet Control Message Protocol) ± RFC 792, page 2 ± ICMP provides error reporting, flow control and first-hop gateway redirection ± Provide feedback about problems in the networks ± Report errors in the processing of packets ± No ICMP messages are sent about ICMP messages
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 10/30/07 ICMP ± MAC header + IP header + ICMP header + Data ::: ± ICMP header ± 8-bit type + 8-bit code + 16-bit header checksum ± Type Meaning ± 0E c h o ( p i n g ) ± 3 Destination unreachable ± 0: Network unreachable; 1: Host unreachable ± 2: Protocol unreachable; 3: Port unreachable ± 4: Fragmentation needed but DF bit set ± 5R e d i r e c t
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This note was uploaded on 08/06/2008 for the course CSE 404 taught by Professor Cheng during the Fall '07 term at Lehigh University .

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Oct30 - CSE/ECE404: Computer Networks Instructor: Dr. Liang...

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