Network Protocols Internet Protocol version 6 IPv6 TDC375 Autumn 03 04 John Kristoff DePaul University 1 Motivation for IPv6 The overriding need was for a larger address space Other potentially useful things were done simpler header format fragmentation by the network is not allowed header checksumming is no longer done multiple addresses and scopes per interface not fully ironed out how all this will be done Note at this time routing is essentially unchanged TDC375 Autumn 03 04 John Kristoff DePaul University 2 IPv6 datagram format TDC375 Autumn 03 04 John Kristoff DePaul University 3 IPv6 Options TDC375 Autumn 03 04 John Kristoff DePaul University 4 Fragmentation changes TDC375 Autumn 03 04 John Kristoff DePaul University 5 Changes to other protocols ICMP streamlined combined with IGMP Upper layers need to know about IPv6 addresses New DNS record types e g AAAA RIP updated RIPng OSPF updated OSPFv3 DHCPv6 TDC375 Autumn 03 04 John Kristoff DePaul University 6 IPv6 transition When if ever 6Bone and tunneling Dual stacks Address translation Software stack changes required TDC375 Autumn 03 04 John Kristoff DePaul University 7 Transition issues Colon hexadecimal notation with 0 s compression e g 2001 435 e201 1 IPv4 addresses can be encoded with 96 leading 0 s e g 140 192 5 1 Assignment and encoding strategies auto configuration EUI 64 encoded use MAC in host id portion privacy extensions geographical encoding etc TDC375 Autumn 03 04 John Kristoff DePaul University 8
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