How is EUI-64 address calculated?

How is EUI-64 address calculated?

IPv6 EUI-64 calculation

1. Split the MAC address in two halves (6 hex digits each).
2. Insert FFFE in between the two, making the interface ID.
3. Invert the seventh bit of the interface ID.

Which statement is correct about the EUI-64 address format of the interface ID for stateless autoconfiguration that is used by Cisco?

Which statement is correct about the EUI-64 address format of the interface ID for stateless autoconfiguration that is used by Cisco? It expands the 48-bit MAC address to 64 bits by inserting FFFE into the middle 16 bits and then inverting the 7th bit in the first octet.

What is EUI-64 format?

Modified Extended Unique Identifier 64 (EUI-64) is the process that allows a host to assign itself a unique IPv6 address. The host’s MAC address is converted into a 64-bit identifier, called a Modified EUI-64, and this value is appended to a 64-bit network prefix learned by other means.

How is an EUI-64 format interface ID created?

How is an EUI—64 format interface ID created from a 48-bit MAC address? The modified EUI-64 format interface identify is drived from the 48-bit link-layer (MAC) address by inserting the hexadecimal number FFFE between the upper 3 bytes (OUI field) and the lower 3 bytes (serial number) of the link layer address.

What is EUI-64 used for?

EUI-64 (Extended Unique Identifier) is a method we can use to automatically configure IPv6 host addresses. An IPv6 device will use the MAC address of its interface to generate a unique 64-bit interface ID.

What is interface identifier?

The interface ID identifies an interface of a particular node. An interface ID must be unique within the subnet. Neighbor Discovery automatically generates the interface ID, based on the MAC or EUI-64 address of the host’s interface. …

What is the main security concern over using EUI-64 formatting?

By encoding MAC addresses, EUI-64 addresses violate layers by exposing hardware identifiers in IPv6 addresses. The hypothetical threat of EUI-64 addresses is well-known, and the adoption of privacy extensions in operating systems (OSes) suggests this vulnerability has been mitigated.

How do you use EUI-64?

The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. The MAC address is first separated into two 24-bits, with one being OUI (Organizationally Unique Identifier) and the other being NIC specific. The 16-bit 0xFFFE is then inserted between these two 24-bits for the 64-bit EUI address.

How do I find the interface identifier?

You can launch a command prompt by pressing “Windows Key-R,” typing “cmd” and pressing “Enter.” Select the command prompt window, type the command “route print” and press “Enter” to display the “Interface List” and system routing tables.

Why is the 7th bit flipped?

5 Answers. And RFC 2373 provides the ‘why’ behind flipping the 7th bit: The motivation for inverting the “u” bit when forming the interface identifier is to make it easy for system administrators to hand configure local scope identifiers when hardware tokens are not available.

What is stateless autoconfiguration EUI-64?

Stateless autoconfiguration or SLAAC SLAAC is a method in which the host or router interface is assigned a 64-bit prefix, and then the last 64 bits of its address are derived by the host or router with help of EUI-64 process which is described in next few lines.

What is Eui-64 in IPv6?

EUI-64 (Extended Unique Identifier) is a method we can use to automatically configure IPv6 host addresses. An IPv6 device will use the MAC address of its interface to generate a unique 64-bit interface ID. However, a MAC address is 48 bit and the interface ID is 64 bit.