Convert the octet back into hexadecimal from binary. (The seventh bit will be 0, make it a 1). Note: The MAC address 11:22:33:44:55:66 will be used for the following examples. The IPv6 address is thus not simulated 1:1. Take the MAC address and convert the first octet from hexadecimal into binary. The leading zero in the IPv6 Address was removed. Get-NetIPAddress -AddressFamily IPv6 -InterfaceAlias "Ethernet" -PrefixOrigin Wellknown | Select-Object IPAddressĪs we can see, however, the parts that should be identical (MAC Address and IPv6 Address) are not exact identical. Set-NetIPv6Protocol -RandomizeIdentifiers Disabled If you want to change this simply set the RandomizIdentifier to Disabled. Execute the Convert-MacToIPv6LinkLocalAddress function with arguments appropriate to your needs. Run Get-NetAdapter to show the ID of your network card. A PowerShell function which converts a MAC address into an IPv6 Link Local address. The %2 at the end is the interface number of the network card. The setting is called RandomizeIdentifier and it’s enabled. Get-NetIPConfiguration | Select-Object IPv6LinkLocalAddress Here’s an example of a random generated IPv6 Link-Local Address. The lack of FFFE indicates that EUI-64 is not used. The MAC address has no influence on this. Take the MAC address and convert the first octet from hexadecimal into binary. The IPv6 address is calculated by using a random value. Windows operating systems don’t use EUI-64. Left and right of FF: FE are the parts of the MAC address of the interface. The MAC address is split into two parts and then FFFE is inserted in the middle of these two parts. Let’s take a look at a Cisco router. The IPv6 address of this router is calculated from the MAC address of the interface. We can activate the EUI-64 process, but by default Windows uses a random value for generating IPv6 Link-Local Addresses.ĮUI-64 (64-Bit Extended Unique Identifier) This process is called EUI-64, and the assumption that Windows (Vista and above) use EUI-64 is wrong. 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. In articles, blogs and forums I often read that Windows forms the IPv6 address from the MAC address. On Linux use ip or ifconfig for most Windows look at the driver settings of your network interface.
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