Notice below the interface used the prefix we gave it and configured the rest of the 64 bits via it’s EUI64 process. Nota : per i seguenti esempi verrà utilizzato lindirizzo MAC 11:22:33:44:55:66. The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. Prendi lindirizzo MAC e converti il primo ottetto da esadecimale a binario. From the second thread, IPv6 Address Format with Interface ID and EUI-64, quoting Keith Barker - 'So the bottom line is that the bit, on or off, doesnt mean anything anymore, but at some historical point it probably did.' 4. This feature is a key benefit over IPv4 as it eliminates the need of manual configuration or DHCP as in the world of IPv4. Follow our guide for easy generation of IPv6 link-local addresses from MACs. Router(config-if)#ipv6 address 2000:9999::/64 eui-64 Extended Unique Identifier (EUI), as per RFC2373, allows a host to assign iteslf a unique 64-Bit IP Version 6 interface identifier (EUI-64). Learn how to convert a MAC address to an IPv6 link-local address using EUI-64 method. What we can also do is give our interface a /64 prefix, and then tell it to use eui-64 for the rest of the configuration. Utilizing EUI-64 when configuring an interface: FFFE is placed in the middle: EUI-64 Step 2. so to fill the remaining space: EUI-64 Step 1. Why was FFFE chosen to be put in the middle of the mac address? This is a reserved HEX address and thus will never be used by manufacturers. A MAC address is only 48 bits, but we need 64 bits for the host identifier of an address with a /64 prefix. This allows us to randomly generate the EUI-64 address, and then it’s changed over-time to prevent further recon. Meaning getting the MAC of a phone or PC will now allow us to find the address and hone in on that traffic. This prevents people from correlating a device based on their IP address. We also have IPv6 temporary addresses, which is a privacy extension. This process happens automatically when we enable IPv6. It’s purpose is to let us know if the address came from DHCP, or it was generated via EUI-64. This seventh bit is called the universal/locally significant bit. If we convert 0027 from hex to binary we get 0000 0000 0010 0111, the seventh bit is 0 so we make it 1.Ġ000 0010 0010 0111 converted to hex it says 227Īnd here is the EUI-64 derived addressed for link local and global EUI-64 stands for Extended Unique Identifier, it is a way for an IPv6 host to automatically assign itself an IPv6 address via using it’s mac address.ĮUI-64 allows us to configure the interface id part of an IPv6 address (last 64 bits)ĮUI-64 requires that the network part of the address be 64 bits and no smaller.ģ.Then from the interface ID, flip the seventh bit from 0 to 1, or 1 to 0 (must be in binary first)
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