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Is that if the physical hardware changes, so does the IPv6 address. The firstĦ4 bits of the device's address are supplied using the Or in IPv6 colon hexadecimal notation, 3BA7:94FF:FE07:CBD0. The identifier thus becomes ∳B-A7-94-FF-FE-07-CB-D0, To one, which changes the first octet from ∳9 to ∳B. The local portion of ∰7-CB-D0 becomes the This can then be combined with a network prefix (routing prefix and subnet ID) to determine a corresponding IPv6 address for the device.Īddress of 39-A7-94-07-CB-D0 (illustrated in Figure 98 ):įigure 98: Converting IEEE 802 MAC Addresses To IPv6 Modified EUI-64 IdentifiersĢ4 bits of the identifier, and put it into the first (leftmost) 24 bits A simple process can be used to determine the interface identifier from the 48-bit MAC address of a device like an Ethernet network interface card. Key Concept: The last 64 bits of IPv6 unicast addresses are used for interface identifiers, which are created in a special format called modified EUI-64. This gives us the modified EUI-64 interface ID. We change the universal/local bit (bit 7 from the left)įrom a zero to a one.
We take the 24-bit local portion (the right-mostĢ4 bits of the Ethernet address) and put it into the right-most 24 bits Left-most 24 bits of the Ethernet address, and put them into the left-mostĢ4 bits of the interface ID.
These can be converted to EUI-64Īnd then to modified EUI-64 form for creating an IPv6 interface ID. IPv6 Interface Identifiers and Physical Address MappingĬonverting 48-Bit MAC Addresses to IPv6 Modified EUI-64 Identifiers IPv6 Special Addresses: Reserved, Private (Link-Local / Site-Local), Unspecified and Loopback Then click "Add Filter." at the bottom, and add this string: Then just click OK.ĩ TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)ĩ TCP/IP Internet Layer (OSI Network Layer) Protocolsĩ Internet Protocol (IP/IPv4, IPng/IPv6) and IP-Related Protocols (IP NAT, IPSec, Mobile IP)ĩ Internet Protocol Version 6 (IPv6) / IP Next Generation (IPng) Or go to the Tools menu and select "Adblock Plus Preferences.". To do so, just open the Adblock menu and select "Disable on ". If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. It's priced very economically and you can read all of it in a convenient format without ads. If you like The TCP/IP Guide, please consider the download version. And I have a family to support, just like you. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. The TCP/IP Guide - IPv6 Interface Identifiers and Physical Address Mapping