DHCPv6

Internet protocol suite
Application layer
DHCP DHCPv6 DNS FTP HTTP IMAP IRC LDAP MGCP NNTP BGP OSPF NTP POP RPC RTP RTSP RIP SIP SMTP SNMP SOCKS SSH Telnet TLS/SSL XMPP (more)
Transport layer
TCP UDP DCCP SCTP RSVP (more)
Internet layer
IP IPv4 IPv6 ICMP ICMPv6 ECN IGMP IPsec (more)
Link layer
ARP/InARP NDP Tunnels L2TP PPP Media access control Ethernet DSL ISDN FDDI (more)
v t e

DHCPv6 is the version of the Dynamic Host Configuration Protocol (DHCP) for Internet Protocol Version 6 (IPv6) networks.

In addition to stateless address autoconfiguration in IPv6, DHCPv6 provides an alternate solution to assign addresses, nameservers and other configuration information in a manner similar to DHCP for IPv4. A notable case is Domain Name System servers used on a network, although other mechanisms exist for this in the Neighbor Discovery Protocol.^[1]

Operation

Port numbers

DHCPv6 uses UDP port number 546 for clients and port number 547 for servers.

DHCP Unique Identifier

The DHCP Unique Identifier (DUID) is used by a client to get an IP address from a DHCPv6 server. It has a minimum length of 12 bytes (96 bits) and a maximum length of 20 bytes (160 bits). Its actual length depends on its type. The server compares the DUID with its database and delivers configuration data (address, lease times, DNS servers, etc.) to the client. The first 16 bits of a DUID contain the DUID type, of which there are three types. The meaning of the remaining 96 bits depend on the DUID type.

Example

In this example, the server's link-local address is fe80::0011:22ff:fe33:5566/64 and the client's link-local address is fe80::aabb:ccff:fedd:eeff/64.

• DHCPv6 client sends a Solicit from [fe80::aabb:ccff:fedd:eeff]:546 for [ff02::1:2]:547.
• DHCPv6 server replies with an Advertise from [fe80::0011:22ff:fe33:5566]:547 for [fe80::aabb:ccff:fedd:eeff]:546.
• DHCPv6 client replies with a Request from [fe80::aabb:ccff:fedd:eeff]:546 for [ff02::1:2]:547.
• DHCPv6 server finishes with a Reply from [fe80::0011:22ff:fe33:5566]:547 for [fe80::aabb:ccff:fedd:eeff]:546.

Implementations

• Dibbler, a portable DHCPv6 implementation for Linux and Windows
• Dnsmasq, lightweight server for Unix-like operating systems targeted at home networks.
• ISC DHCP, version 4.1.0 and later, for Solaris, Linux and BSD
• Jagornet DHCPv6, an IPv6 Phase II Ready Certified DHCPv6 Server implemented in Java
• Linux DHCPv6 no new development, obsoleted by ISC DHCP
• Microsoft Windows Vista and later, built in Microsoft Windows (client only). Windows Server 2008 and later versions of Windows Server have a DHCPv6 role.
• WIDE-DHCPv6, a DHCPv6 implementation for BSD and Linux

IETF standards

• RFC 3315, "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"
• RFC 3319, "Dynamic Host Configuration Protocol (DHCPv6) Options for Session Initiation Protocol (SIP) Servers"
• RFC 3633, "IPv6 Prefix Options for Dynamic Host Configuration Protocol (DHCP) version 6"
• RFC 3646, "DNS Configuration options for Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"
• RFC 3736, "Stateless Dynamic Host Configuration Protocol (DHCP) Service for IPv6"
• RFC 5007, "DHCPv6 Leasequery"
• RFC 6221, "Lightweight DHCPv6 Relay Agent"

References

External links

• IPv6 Intelligence: DHCPv6, comparison of DHCPv6 packages and implementations

v t e Internet Protocol version 6 General IPv6 IPv6 address IPv6 packet Mobile IPv6 Deployment IPv6 deployment Comparison of IPv6 application support Comparison of IPv6 support in routers Comparison of IPv6 support in operating systems Comparison of IPv6 support by major transit providers List of IPv6 tunnel brokers IPv4 to IPv6 topics IPv4 address exhaustion IPv6 transition mechanisms Related protocols DHCPv6 ICMPv6 Neighbor Discovery Protocol Secure Neighbor Discovery Protocol Multicast Router Discovery Site Multihoming by IPv6 Intermediation

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