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IPv6

IPv6. Computer Networks. Motivation.

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IPv6

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  1. IPv6 Computer Networks John Kristoff

  2. Motivation The primary motivation from changing the IP datagram format is to increase the size of the useable address space from 32 bits to 128 bits. Secondary reasons include routing improvements, simplicity in header format and even to bring back some of the end-to-end principles that are being lost due to NAT and firewalls. John Kristoff

  3. IPv6 Header Format John Kristoff

  4. Options Move Out John Kristoff

  5. Fragmentation Changes • Fragmentation is no long done by routers • Hosts musts discover the path MTU • This is a significant change from IPv4! John Kristoff

  6. Addressing Changes • Using IPv4 system • 105.220.136.100.255.255.255.255.0.18.128.140.10.255.255 • IPv6 colon hexadecimal notation • 69dc:8864:ffff:ffff:0:1280:8c0a:ffff • With zero compression • ff0c:0:0:0:0:0:0:b1 becomes ff0c::b1 • IPv4 addresses start with 96 zeroes • No more broadcast, new anycast address John Kristoff

  7. Final Thoughts • What’s taking so long? • NAT, CIDR, killer applications • Might help return end-to-end principles • Difficult to upgrade all hosts • Dual stacks • Encapsulation • Other benefits and problems? John Kristoff

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