![]() ![]() They are concerned that their packets can be traced to the actual physical computer. However, this has caused privacy concerns among many users. ![]() It also allows network administrators to easily track an IPv6 address to an end-device using the unique MAC address. The advantage of EUI-64 is the Ethernet MAC address can be used to determine the Interface ID. Note: The use of the U/L bit and the reasons for reversing its value are discussed in RFC 5342. The result is an EUI-64 generated Interface ID of FE99:47FF:FE75:CEE0. In this example the 0 in bit 7 is changed to a 1. Step 3: Convert the first 2 hexadecimal values of the OUI to binary and flip the U/L bit (bit 7). Step 2: Insert the hexadecimal value FFFE, which in binary is: 1111 1111 1111 1110. Step 1: Divide the MAC address between the OUI and device identifier. The EUI-64 process is illustrated in Figure 1, using R1’s GigabitEthernet MAC address of FC99:4775:CEE0. ![]() 24-bit Device Identifier from the client MAC address.The inserted 16-bit value FFFE (in hexadecimal).This means that if the 7th bit is a 0 it becomes a 1, and vice versa. 24-bit OUI from the client MAC address, but the 7th bit (the Universally/Locally (U/L) bit) is reversed.Device Identifier – The device identifier is a unique 24-bit (6 hexadecimal digits) value within a common OUI.Īn EUI-64 Interface ID is represented in binary and is made up of three parts:.Organizationally Unique Identifier (OUI) – The OUI is a 24-bit (6 hexadecimal digits) vendor code assigned by IEEE.This process uses a client’s 48-bit Ethernet MAC address, and inserts another 16 bits in the middle of the 48-bit MAC address to create a 64-bit Interface ID.Įthernet MAC addresses are usually represented in hexadecimal and are made up of two parts: IEEE defined the Extended Unique Identifier (EUI) or modified EUI-64 process. ![]()
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