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Vijaya Bhaskar A K Internet Services Jan 5, 2000 DHCPv6 and Address Configuration

Vijaya Bhaskar A K Internet Services Jan 5, 2000 DHCPv6 and Address Configuration. IPv6 Addressing Architecture. Unicast Address Multicast Address Anycast Address. Unicast Address. Unspecified Address (0:0:0:0:0:0:0:0) Loopback Address (0:0:0:0:0:0:0:1) IPv4 Embedded IPv4 address

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Vijaya Bhaskar A K Internet Services Jan 5, 2000 DHCPv6 and Address Configuration

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  1. Vijaya Bhaskar A K Internet Services Jan 5, 2000 DHCPv6 and Address Configuration

  2. IPv6 Addressing Architecture Unicast Address Multicast Address Anycast Address

  3. Unicast Address • Unspecified Address (0:0:0:0:0:0:0:0) • Loopback Address (0:0:0:0:0:0:0:1) • IPv4 Embedded IPv4 address • IPv4 compatible IPv6 Address (e.g.) ::15.10.23.2 • IPv4 mapped IPv6 Address (e.g.) ::ffff:15.10.23.2 • Aggregatable Global Unicast Address • Link Local Address (prefix is fe80) • Site Local Address (prefix is fec0)

  4. Multicast and Anycast Address • Multicast • Link local (prefix is FF02) • Site local (prefix is FF05) • Globally unique (prefix is FF0E) • Anycast • Allocated in Unicast Space • (e.g.) Subnet Router Anycast Address subnet-prefix(n bits)+0s(128-n bits)

  5. Life Times of IP Addresses Valid Life Time Preferred Life Time

  6. IPv6 Address Configuration Stateful Autoconfiguration Stateless Autoconfiguration

  7. Stateless Autoconfiguration Advantages Simple to use No need of Servers

  8. Stateless Autoconfiguration Disadvantages Inefficient use of address space Lack of Network Access Control Manages Only Addresses No Authentication

  9. Reconfiguration in DHCPv6 Server plays active role Used by Network Administrator in network renumbering

  10. Stateful Autoconfiguration Dynamic Host Configuration Protocol for IPv6 (DHCPv6) Client / Server Model of Architecture Centralized Address Management

  11. DHCP Message Transactions

  12. DHCP Message Transactions

  13. DHCP Message Transactions

  14. DHCP Message Transactions

  15. Identity Association • Identifies Client bindings • IA constitutes following fields • UUID • Time values T1 and T2 • IP Addresses

  16. Features of DHCPv6 • Multiple IP addresses per interface • Authentication • Reconfiguration • Freedom from BOOTP Compatibility • Dynamic DNS Updates

  17. Authentication in DHCPv6 • Need for authentication • ensures the parameters are obtained from authoritative servers • prevents denial of service attacks • Authentication Mechanism • HMAC using keyed-MD5 • Replay Protection

  18. Current Standards Internet Draft on DHCPv6 draft-ietf-dhc-dhcpv6-16.txt Internet Draft on DHCPv6 Extensions draft-ietf-dhc-dhcpv6exts-12.txt

  19. Features of the New Draft • Common DHCP message headers • Removal of Reconfigure and Reconfigure Reply messages • New Relay behavior - Encapsulated message • Introduction of Identity Association

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