Difference between revisions of "EUI-64"

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=EUI-64=
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EUI-64 or Modified EUI-64 are often used as the lower 64 bit of a [[IPv6 Address]].
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==EUI-64==
 
EUI-64<ref>http://standards.ieee.org/develop/regauth/tut/eui64.pdf</ref> or Extended Unique Identifier is a 64 bit Global Identifier administered by IEEE<ref name=IEEE>http://www.ieee.org/index.html</ref>
 
EUI-64<ref>http://standards.ieee.org/develop/regauth/tut/eui64.pdf</ref> or Extended Unique Identifier is a 64 bit Global Identifier administered by IEEE<ref name=IEEE>http://www.ieee.org/index.html</ref>
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==Examples of use==
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===Examples of use===
 
FireWire<ref>http://en.wikipedia.org/wiki/IEEE_1394_interface</ref> and in IPv6 as least significant 64 bits in [[Link-Local IPv6 Address|Link-Local]] and [[Global Unicast IPv6 Address|Global Unicast]] if [[Stateless Autoconfiguration IPv6|Stateless Autoconfiguration]]. (Except Systems that will choice a Random page fx. [[Windows 7 IPv6|Windows 7]])
 
FireWire<ref>http://en.wikipedia.org/wiki/IEEE_1394_interface</ref> and in IPv6 as least significant 64 bits in [[Link-Local IPv6 Address|Link-Local]] and [[Global Unicast IPv6 Address|Global Unicast]] if [[Stateless Autoconfiguration IPv6|Stateless Autoconfiguration]]. (Except Systems that will choice a Random page fx. [[Windows 7 IPv6|Windows 7]])
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=EUI-48=
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==EUI-48==
 
EUI-48<ref>http://standards.ieee.org/develop/regauth/tut/eui48.pdf</ref> or Extended Unique Identifier is a 48 bit Global Identifier administered by IEEE<ref>http://www.ieee.org/index.html</ref>.  
 
EUI-48<ref>http://standards.ieee.org/develop/regauth/tut/eui48.pdf</ref> or Extended Unique Identifier is a 48 bit Global Identifier administered by IEEE<ref>http://www.ieee.org/index.html</ref>.  
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==Examples of use==
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===Examples of use===
 
Ethernet MAC addresses is a example of EUI-48 usage. Other examples of technologies that use EUI-48 are [[Bluetooth]] and 802.11 Wireless Networks.  
 
Ethernet MAC addresses is a example of EUI-48 usage. Other examples of technologies that use EUI-48 are [[Bluetooth]] and 802.11 Wireless Networks.  
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=IPv6 Modifed EUI-64 Address=
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==IPv6 Modifed EUI-64 Address==
 
{|
 
{|
 
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|valign="top" |
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==Understanding the MAC-Address==
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===Understanding the MAC-Address===
 
The MAC-Address is divided into two parts.
 
The MAC-Address is divided into two parts.
 
#The first 24 bits identifies the manufacturer and are called the OUI
 
#The first 24 bits identifies the manufacturer and are called the OUI
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|valign="top" |
 
|valign="top" |
 
==Generating the Modified EUI-64==
 
==Generating the Modified EUI-64==
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When generating a modified EUI-64 as the 64 lower bits of a [[IPv6 Address]] the hosts EUI-48 (MAC-Address) is expanded to 64 bits by inserting FF:FE between the OUI and the Extension Identifer or NIC.  
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When generating a modified EUI-64 as the 64 lower bits of a [[IPv6 Address]] the hosts EUI-48 (MAC-Address) is expanded to 64 bits by inserting FF:FE between the OUI and the Extension Identifer or NIC and setting the Locally Administered Bit.
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===Example===
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*A node with MAC-address 00:10:56:A7:16:D5 will generate 00:10:56:'''FF:FE''':A7:16:D5 as EUI-64
 
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[[Image:EUI-64 address generation.png|400px|Generation of the EUI-64 identifier from the MAC-address]]
 
[[Image:EUI-64 address generation.png|400px|Generation of the EUI-64 identifier from the MAC-address]]
 
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|-
 
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=References=
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==References==
 
<references/>  
 
<references/>  
 
[[Category:IPv6]]
 
[[Category:IPv6]]

Latest revision as of 12:18, 13 June 2011

EUI-64 or Modified EUI-64 are often used as the lower 64 bit of a IPv6 Address.

EUI-64

EUI-64[1] or Extended Unique Identifier is a 64 bit Global Identifier administered by IEEE[2]

Examples of use

FireWire[3] and in IPv6 as least significant 64 bits in Link-Local and Global Unicast if Stateless Autoconfiguration. (Except Systems that will choice a Random page fx. Windows 7)

EUI-48

EUI-48[4] or Extended Unique Identifier is a 48 bit Global Identifier administered by IEEE[5].

Examples of use

Ethernet MAC addresses is a example of EUI-48 usage. Other examples of technologies that use EUI-48 are Bluetooth and 802.11 Wireless Networks.

IPv6 Modifed EUI-64 Address

Understanding the MAC-Address

The MAC-Address is divided into two parts.

  1. The first 24 bits identifies the manufacturer and are called the OUI
    1. The OUI is administered by IEEE[2]
  2. The last 24 bits identifies Extension Identifier or NIC
    1. The manufacturer can use this field as serial-number

The MAC-Address is Global Unique and has two flag in its first octet. (Byte)

  • bit 1: Unicast or Multicast
    • The MAC 'broadcast' address FF:FF:FF:FF:FF:FF is really a Well-Known link-local Multicast address used by for example IPv4 ARP and DHCP.
  • bit 2: Globally or locally administered. When bit 2 is 0 the Global Unique IEEE[2] identifier is used. When bit 2 is 1 it's a Local generated address.

The MAC-address is a EUI-48 Identifier

Generating the Modified EUI-64

When generating a modified EUI-64 as the 64 lower bits of a IPv6 Address the hosts EUI-48 (MAC-Address) is expanded to 64 bits by inserting FF:FE between the OUI and the Extension Identifer or NIC and setting the Locally Administered Bit.

Example

  • A node with MAC-address 00:10:56:A7:16:D5 will generate 00:10:56:FF:FE:A7:16:D5 as EUI-64

Generation of the EUI-64 identifier from the MAC-address

References

  1. ↑ http://standards.ieee.org/develop/regauth/tut/eui64.pdf
  2. ↑ 2.0 2.1 2.2 http://www.ieee.org/index.html
  3. ↑ http://en.wikipedia.org/wiki/IEEE_1394_interface
  4. ↑ http://standards.ieee.org/develop/regauth/tut/eui48.pdf
  5. ↑ http://www.ieee.org/index.html
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