In the context of IPv6, this is extremely useful, as it allows an interface to automatically generate the “host” part of its IPv6 address from its MAC address. But what is EUI-64?ĮUI-64 is a standard that converts a 48-bit MAC address, commonly used to identify network interfaces, into a unique 64-bit identifier. One of the most common methods is to use EUI-64. When configuring IPv6 addresses on network interfaces, it is sometimes necessary to generate addresses automatically. RFC 4291 and its predecessors RFC 3513 and RFC 2373, all explain in Appendix A how to create SLAAC addresses for other types of data-link protocols, and IPv6 never required MAC addressing. Automatic IPv6 address generation with EUI-64 Not all data-link protocols, use MAC addressing, yet they can still carry IPv6 and use the original SLAAC. It does not generate addresses from MAC addresses. “ipv6 address 2001:DB8:5:112::2/64 link-local”: This command manually sets a link-local address. “ipv6 address autoconfig”: Although it may seem correct, this command is too vague and doesn’t specify exactly how the address is generated.ĭ. It does not generate an address from the interface MAC address.Ĭ. “ipv6 address dhcp”: This command requests an IPv6 address from a DHCP server. The following table shows five prefixes and MAC unabbreviated IPv6 addresses convert these to the shortest possible abbreviated IPv6 address.A. In other words, use the solicited node multicast prefix with those last 6 hex digits of the unicast IPv6 address. For IPv4 ARP is used to find out which MAC (Layer-2) address belongs to a certain IP (Layer-3) address. MAC addresses are on Layer-2, IP on Layer-3 of the OSI model. This multicast address is formed by taking the unicast address, and replacing the first 104 bits (26 hex digits) with FF02::1:FF00:0/104. On Linux use ip or ifconfig for most Windows look at the driver settings of your network interface. Do some math on the first byte of the MAC address to invert (flip) the 7 th of 8 bits (counting left-to-right)įor this exercise, take the listed prefixes and MAC addresses, and create the IPv6 address the device would use.Įxtra credit: Also, if interested, you can think about the solicited node multicast address the host would use along with the unicast address. Convert a mac address between dot notation, bit-reversed, hexadecimal and more Paste MAC Address below.Insert hex FFFE in the middle between the two, completing the 16 hex digits in the 2nd half of the number. ![]()
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