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IPv6 DHCP. By : Santosh Yadav IIT Kanpur. IPv6 Dynamic Host Configuration Protocol Overview. Evolution Of DHCPv6 DHCPv6 Concepts Installation Configuration. Evolution Of DHCPv6 . To boot the machines in a LAN, needs lot of network parameters to be configured in each machine.

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ipv6 dhcp

IPv6 DHCP

By : Santosh Yadav

IIT Kanpur

ipv6 dynamic host configuration protocol overview
IPv6 Dynamic Host Configuration Protocol Overview
  • Evolution Of DHCPv6
  • DHCPv6 Concepts
  • Installation
  • Configuration
slide3

Evolution Of DHCPv6

  • To boot the machines in a LAN, needs lot of network parameters to be configured in each machine.
  • In order to avoid this manual process, all the network parameters are put in a server and when a machine in LAN is booting, it will contact the server for the configuration parameters. This is called BOOTP server. Later it is extended to DHCP with additional features.
  • Generally called DHCP
slide4

Evolution Of DHCPv6

IP configuration in IPV6 is carried out by IPV6 auto-configuration

IPv6 auto-configuration

  • Stateless
      • nodes configure addresses themselves with

information from routers (if available);

      • no managed addresses
  • Stateful
      • nodes use DHCPv6 to obtain addresses.
      • Duplicate address detection (DAD) used to avoid

duplicated addresses

dhcpv6 concepts
Dhcpv6 Concepts
  • What is DHCPv6 ?
  • The Dynamic Host Configuration Protocol for IPv6

(DHCP) enables DHCP servers to pass configuration

parameters such as IPv6 network addresses to IPv6

nodes.

  • DHCPv6 protocol Released in RFC 3315
  • This protocol is a stateful counterpart to "IPv6 Stateless

Address Autoconfiguration" (RFC 2462).

  • Used separately or concurrently with the latter to obtain

configuration parameters.

slide6

Dhcpv6 Concepts…

  • DHCPv6 Versus DHCPv4
  • The following lists the main differences between DHCPv4 and DHCPv6:
  • Unlike DHCPv4, IPv6 address allocation in DHCPv6 is

handled using a message option.

  • The message types, such as DHCPDISCOVER and

DHCPOFFER supported by DHCPv4 are removed in

DHCPv6. Instead, DHCPv6 servers are located by a client

SOLICIT message followed by a server ADVERTISE message

  • Unlike DHCPv4 clients, DHCPv6 clients can request multiple

IPv6 addresses.

dhcpv6 concepts1
Dhcpv6 Concepts…

Why we need dhcpv6 ?

  • A method of providing stateful IPv6 address configuration/assignment
  • Also provides “other” network information
  • DNS servers
  • NIS information
  • DHCP allows centralized control and
  • auditing of IP address assignments
  • Central point of control for resources
  • Dynamic DNS updates
  • More security versus stateless
dhcpv6 concepts2
Dhcpv6 Concepts…

DHCPv6 Basic Message Format

0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7

• SOLICIT

• ADVERTISE

• REQUEST

• CONFIRM

• RENEW

• REBIND

• REPLY

• RELEASE

• DECLINE

• RECONFIGURE

• INFORMATION-REQUEST

• RELAY-FORW

• RELAY-REPL

slide10

Dhcpv6 Concepts…

DHCP Messages

  • Messages exchanged using UDP
    • Client port – udp/546
    • Server Port – udp/547
  • Client uses Link-Local address or addresses determined using other methods to transmit and receive DHCP messages.
  • Server receives messages from clients using a reserved, Link-Scoped multicast address.
slide11

Dhcpv6 Concepts…

DHCP Multicast Addresses

  • All_DHCP_Relay_Agents_and_Servers
    • Link-scoped multicast address used by a client to communicate with on-link relay agents and servers
    • FF02::1:2
  • All_DHCP_Servers
    • Site-scoped multicast address used by a relay agent to communicate with servers
    • FF05::1:3
dhcpv6 concepts3
Dhcpv6 Concepts…

DHCPv6 option format and base option

0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7

• Client Identifier

• Server Identifier

• Identity Association for Non-temporary

Addresses

• Identity Association for Temporary

Addresses

• IA Address

• Option Request

• Preference

• Elapsed Time

• Relay Message

• Authentication

• Server Unicast

• Status Code

• Rapid Commit

• User Class

• Vendor Class

• Vendor-specific Information

• Interface-Id

• Reconfigure Message

• Reconfigure Accept

slide13

Dhcpv6 Concepts…

DHCP Unique Identifer (DUID)

  • Each DHCP client and server has a DUID. DHCP servers use DUIDs to identify clients for the selection of configuration parameters and in client Identity Associations.
    • Unique across all clients and servers
    • Should not change over time (if possible)
    • Must be < 128 octets long
slide14

Dhcpv6 Concepts…

Identity Association

  • An identity association (IA) is a construct through which a server and client can identify, group, and manage a set of related IP addresses.
    • Client must associate at least one distinct IA with each

network interface requesting assignment of IP

addresses from DHCP server (IAID)

    • Must be associated with exactly one interface
    • Must be consistent across restarts by the client
slide15

DHCPv6 working

SOLICIT

DHCP client

DHCP server B

DHCP server A

T I M E

ADVERTISE

ADVERTISE

REQUEST

Client select one advertise server B

REPLY

Client Now use address and parameter for lifetime

Client renew life time

RENEW

REPLY

Client releases address when shutting down

RELEASE

dhcpv6 concepts4
Dhcpv6 Concepts…
  • Dhcpv6 operation :
  • Client sends messages to link-local multicast address
  • Server unicasts response to client
  • Information-Request / Reply - provide client configuration
  • information but no addresses
  • Confirm / Reply - assist in determining whether client moved
  • Reconfigure - allow servers to initiate a client reconfiguration
  • Basic client/server authentication capabilities in base

standard.

  • DHCP Unique Identifier (DUID) used to identify clients &

servers

  • Identity Association ID (IAID) used to identify a collection of
  • addresses
  • Relay Agents used when server not on-link
  • Relay Agents may be chained
ongoing project
Ongoing Project
  • Previously DHCPv6 v1.001and now DHCPv6 2.001 available for the HP-UX 11i v1 and HP-UX 11i v2 operating systems http:/docs.hp.com
  • Dibbler is a portable DHCPv6 implementation on Linux 2.4/2.6 and Windows XP and Windows 2003.

This project was started as master thesis by Tomasz Mrugalski and Marek Senderski of Computer Science faculty on Gdansk University of Technology.

http://klub.com.pl/dhcpv6/

  • Project UNIX name: dhcpv6

Operating System: All POSIX (Linux/BSD/UNIX-like OSes), Linux

http://dhcpv6.sourceforge.net/

installation
Installation

Dhcpv6 server :

  • Update with dhcpv6-0.10-11_FC3.i386.rpm using

# rpm -U dhcpv6-0.10-11_FC3.i386.rpm

  • Create a database directory

#mkdir /var/db/dhcpv6

  • Copy sample server configuration file

# cp dhcp6s.conf /etc/dhcp6s.conf

  • Start the server daemon using

# dhcp6s –dDf eth0

installation1
Installation…

Dhcpv6 client :

  • Update with dhcpv6_client-0.10-11_FC3.i386.rpm using

# rpm -U dhcpv6_client-0.10-11_FC3.i386.rpm

  • Copy sample client configuration file

# cp dhcp6c.conf /etc/dhcp6c.conf

  • Start the client daemon using

# dhcp6c –dDf eth0

slide20

Configuration

In Fedora core 3 following files are configured :

Server configuration :

/etc/sysconfig/dhcp6s

/etc/dhcp6s.conf

File : /etc/sysconfig/dhcp6s

Specify the interface for dhcp6s

DHCP6SIF=eth0

slide21

Configuration…

Server configuration...

File : /etc/dhcp6s.conf

interface eth0 {

server-preference 255;

renew-time 60;

rebind-time 90;

prefer-life-time 130;

valid-life-time 200;

allow rapid-commit;

link BBB {

pool{

range 2001:0E30:1402:2::4 to 2001:0E30:1402:2::ffff/64;

prefix 2001:0E30:1402::/48;

};

};

};

slide22

Configuration…

In Fedora core 3 following files are configured :

Client configuration :

/etc/sysconfig/network-scripts/ifcfg-eth0

/etc/dhcp6c.conf

File : /etc/sysconfig/network-scripts/ifcfg-eth0

IPV6INIT=yes

DHCP6C=yes

slide23

Configuration…

client configuration...

File : /etc/dhcp6c.conf

interface eth0 {

#information-only;

send rapid-commit;

#request prefix-delegation;

#request temp-address;

address {

2001:0E30:1402:1:9656:3:4:56/64;

};

};

slide24

Testing

Start the server daemon in debug mode in foreground

#dhcp6s –dDf eth0

Restart the network service of client

#service network restart

See the address assignment

#ifconfig

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