CORNELL CS 419 - Study References (37 pages)

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Study References



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Study References

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Pages:
37
School:
Cornell University
Course:
Cs 419 - Computer Networks

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CS419 Computer Networks Lecture 3 part 2 Feb 7 2004 IP Internet Protocol More ICMP messages CS419 These were added over time RFC1191 Path MTU Discovery z Added the size of the limiting MTU to the ICMP Packet Too Big message RFC1256 Router Discovery Allows a host to dynamically discover a default router z Router Advertisement Router Solicitation z Path MTU discovery PMTU CS419 Host tries some large MTU sends packets with the DF Don t Fragment bit set If it gets an ICMP Packet Too Big it tries the MTU in the ICMP if there is one or a lower MTU if not There are various well known MTUs it can try Without PMTU hosts default to 1500 for local Ethernet destinations and 576 for non local destinations Recall new functions required by IP architecture CS419 Address resolution How to determine the subnet address of the next hop router or host z A hard problem in the general case z Fragmentation and reassembly z How to accommodate different MTUs Maximum Transmission Unit in different subnets Router discovery and address resolution CS419 How do hosts discover routers over subnets How do hosts and routers find each other s subnet addresses But first IP addresses CS419 Now we are getting to one of the two cores of the Internet The IP address space z The other is the DNS name space z Can t understand router discovery and address resolution without understanding the IP address The most basic basics CS419 IP address is 32 bits long They are written like this 128 93 44 6 z z z dotted decimal notation Each decimal number represents 8 bits We ll look at the slash notation later Each host or router interface is identified by an IP address z The role of IP is to get packets to their corresponding interfaces not to boxes per se Structure of the IP address CS419 Host forwarding algorithm CS419 Upon receiving a packet either from an interface or from the upper layer Is the destination me z If not is the destination on my subnet z If so discover subnet address of destination and transmit



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