Convert mac address to ipv6 eui 64 manual#
Convert mac address to ipv6 eui 64 64 bits#

This is explained in RFC 4291, IP Version 6 Addressing Architecture, Appendix A: Creating Modified EUI-64 Format Interface Identifiers that show the U/L bit needs to be set to 1 to show a locally derived EUI-64 address. However, per RFC4291 2.5.1 (The use of the universal/local bit in the Modified EUI-64 format identifier is to allow development of future technology that can take advantage of interface identifiers with universal scope), this may change in the future as the technology evolves. Actually, the U/L bit needs to be set, but your example clears the bit. Once the above is done, we have a fully functional EUI-64 format address.Īnother doubt or frequently asked question is, are IPv6 devices (routers etc) today doing anything to that universal/local bit? Currently, nothing is being done be the U/L bit 1 or 0. The reason for inverting can be found in RFC4291 section 2.5.1.

Therefore, when the bit is inverted, it maintains its original scope (global unique address is still global unique and vice versa). It is worth noticing that in the OUI portion, the globally unique addresses assigned by the IEEE has always been set to 0 whereas the locally created addresses has 1 configured. If 0, the address is locally administered and if 1, the address is globally unique. This bit identifies whether this interface identifier is universally or locally administered. Next, the seventh bit from the left, or the universal/local (U/L) bit, needs to be inverted. Here is an example showing how a the MAC Address is used to generate EUI. As with IPv4, IPv6 addresses are assigned to interfaces. Conversion of EUI-64 MAC Address to IPv6 Host Address Format Types of IPv6 Addresses.

Convert mac address to ipv6 eui 64 64 bits#

IEEE has chosen FFFE as a reserved value which can only appear in EUI-64 generated from the an EUI-48 MAC address. This format, as illustrated, expands the device interface 48-bit MAC address to 64 bits by inserting FFFE into the middle 16 bits. This is accomplished on Ethernet interfaces.

Convert mac address to ipv6 eui 64 manual#

By implementing the IEEE's 64-bit Extended Unique Identifier (EUI-64) format, a host can automatically assign itself a unique 64-bit IPv6 interface identifier without the need for manual configuration or DHCP. The 16-bit 0xFFFE is then inserted between these two 24-bits for the 64-bit EUI address. One of IPv6's key benefits over IPv4 is its capability for automatic interface addressing. To convert a traditional 48 bit MAC address in EUI. The MAC address is first separated into two 24-bits, with one being OUI (Organizationally Unique Identifier) and the other being NIC specific. The last six input formats shown above are not part of any standard. The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. This feature is a key benefit over IPv4 as it eliminates the need of manual configuration or DHCP as in the world of IPv4.

Extended Unique Identifier (EUI), as per RFC2373, allows a host to assign iteslf a unique 64-Bit IP Version 6 interface identifier (EUI-64).