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Network Protocols

Network Protocols. Internet Protocol version 6 (IPv6). 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

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Network Protocols

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  1. Network Protocols • Internet Protocol version 6 (IPv6)

  2. 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

  3. IPv6 datagram format

  4. IPv6 Options

  5. Fragmentation changes

  6. 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

  7. IPv6 transition • When, if ever? • 6Bone and tunneling • Dual stacks • Address translation • Software/stack changes required

  8. 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.

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