EUI-64

Extended Unique Identifier

• IPv6 Addresses are 128 bits
• Standard netmask is /64
• Networks are 64 bits
• Host ID can be 64 bits
• Each host requires a unique ID

EUI-64 Host ID

• Host IDs can be generated by using the MAC address
• MAC address is 48 bits
• 24 bits will be added
• 64 bit unique host ID!

EUI-64 Example

• MAC Address
  • 01fa.02cb.34de
• EUIA 64 Identifier
  • 01fa.02ff.fecb.34de
• Network Prefix
  • 2001:1234:abcd:5678
• IPv6 Address
  • 2001:1234:abcd:5678:01fa:02ff:fecb:34de

MAC to EUI, Part 1

• Effectively split this in fact, with the filler in the middle.

MAC to EUI, Part 2 - Globally Unique

• It is basically derived from your MAC address, that is a good way to understand it.