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Vijaya Bhaskar A K
Internet Services
Jan 5, 2000
DHCPv6 and Address Configuration
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IPv6 Addressing Architecture
• Unicast Address
• Multicast Address
• Anycast Address
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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)
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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)
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Life Times of IP Addresses
• Valid Life Time
• Preferred Life Time
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IPv6 Address Configuration
• Stateful Autoconfiguration
• Stateless Autoconfiguration
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Stateless Autoconfiguration
• Advantages
• Simple to use
• No need of Servers
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Stateless Autoconfiguration
• Disadvantages
• Inefficient use of address space
• Lack of Network Access Control
• Manages Only Addresses
• No Authentication
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Reconfiguration in DHCPv6
• Server plays active role
• Used by Network Administrator in
network renumbering
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Stateful Autoconfiguration
• Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
• Client / Server Model of Architecture
• Centralized Address Management
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DHCP Message Transactions
DHCPv6CLIENT
DHCPv6AGENT
DHCPv6SERVER
DHCP Solicit
DHCP Advertise
DHCP Advertise
DHCP Solicit
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DHCP Message Transactions
DHCPv6CLIENT
DHCPv6AGENT
DHCPv6SERVER
DHCP Request
DHCP Reply
DHCP Reply
DHCP Request
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DHCP Message Transactions
DHCPv6CLIENT
DHCPv6AGENT
DHCPv6SERVER
DHCP Release
DHCP Reply
DHCP Reply
DHCP Release
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DHCP Message Transactions
DHCPv6 CLIENT
DHCPv6SERVER
DHCP Reconfigure- init DHCP ReplyDHCP Request
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Identity Association
•Identifies Client bindings
•IA constitutes following fields
•UUID
•Time values T1 and T2
•IP Addresses
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Features of DHCPv6
•Multiple IP addresses per interface
•Authentication
•Reconfiguration
•Freedom from BOOTP Compatibility
•Dynamic DNS Updates
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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
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Current Standards
• Internet Draft on DHCPv6 draft-ietf-dhc-dhcpv6-16.txt
• Internet Draft on DHCPv6 Extensions draft-ietf-dhc-dhcpv6exts-12.txt
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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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