class12

class12 - Click to edit Master subtitle style CSCI 233...

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Click to edit Master subtitle style CSCI 233 Class 12 Copyright 2008, David C. Roberts
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Agenda IPv6 22
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Why Change? New computer and communication technologies: Internet integration as product direction New applications: particularly the dual abilities of products to know where they are and communicate with all computers through the Internet Increases in size and load: number of hosts is far beyond earlier expectations and continues to grow 33
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Motivation for Changes to Processor performance, memory sizes increased more than 100 times since late 1970s Internet network bandwidth increased by 7,000 times Number of hosts to 56 million Number of Web sites over 1 billion IPv4 addresses are predicted to run out by 2011 at present rate of use New security features needed Resource reservations needed for new services Need for hierarchical allocation of addresses 44
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Features Larger addresses—from 32 bits to 128 bits Extended address hierarchy—added levels of addressing hierarchy, in particular ISPs Flexible header format—optional headers instead of fixed; incompatible with v4 Improved options—new options for added facilities Provision for protocol extension—can adapt to changes in network hardware, applications Autoconfiguration and renumbering—computers on isolated network can communicate without a router Resource allocation—preallocation of network resources, support for DiffServ 55
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Addressing Capability IPv4 has about 4 billion addresses (232) IPv6 has 2128 addresses Approximately 295 addresses for each person alive today 252 addresses for every observable star in the universe About 1 IPv6 address/5 cm3 in a sphere the size of the earth’s orbit of the sun 66
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Address Space Comparison 77
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IPv6 Datagram Fixed base header, followed by some number of extension headers, followed by data 88
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IPv6 Base Header Former TTL 16 Octe ts Start of extension header Alwa ys 6 99
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Extension Headers 10
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class12 - Click to edit Master subtitle style CSCI 233...

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