I received one query on one of the chat group I am part of asking if there is a way to convert MAC physical address to Link-Local IPV6 address using PowerShell, Infact I had worked on the same kind project of migrating from IPv4 to IPv6 and already written it long bank. Lets see what is the formula behind.
Note: Link-local addresses are not necessarily bound to the MAC addresses.
Here I am creating IPv6 Link-Local Address with network adapter MAC address (Network adapter can be physical or virtual), MAC addresses are 6 bytes (48-bits) in length, I will convert it to 128 bit IPv6 address, Here is the formula for the same, For example I have hexadecimal mac address here 52:15:5D:26:42:09, It need to be add ff:fe in the middle, so it will become 52:15:5D:ff:fe:26:42:09. Take first octet 52 and use second digit 2, convert this hexadecimal bit to binary. For example hexadecimal 2 is 0010 in binary, Now to convert further, I inverted 3rd bit, it means 0010 will become 0000, which represents value 0 in hexadecimal [Here I have json table helps to understand hexadecimal to binary and vice versa as below (x represent the original hexadecimal value, y represents what will happen when I convert it to binary)], so 52 became 50. The complete notation become 50:15:5D:ff:fe:26:42:09. Next I will format it in the IPv6 notation 5015:5Dff:fe26:4209, In the last prepend the link-local prefix fe80::5015:5Dff:fe26:4209 and your Link Local IPv6 Address is ready.
[
{
xHex: '0',
xBin: '0000',
yHex: '2',
yBin: '0010'
},
{
xHex: '1',
xBin: '0001',
yHex: '3',
yBin: '0011'
},
{
xHex: '2',
xBin: '0010',
yHex: '0',
yBin: '0000'
},
{
xHex: '3',
xBin: '0011',
yHex: '1',
yBin: '0001'
},
{
xHex: '4',
xBin: '0100',
yHex: '6',
yBin: '0110'
},
{
xHex: '5',
xBin: '0101',
yHex: '7',
yBin: '0111'
},
{
xHex: '6',
xBin: '0110',
yHex: '4',
yBin: '0100'
},
{
xHex: '7',
xBin: '0111',
yHex: '5',
yBin: '0101'
},
{
xHex: '8',
xBin: '1000',
yHex: 'a',
yBin: '1010'
},
{
xHex: '9',
xBin: '1001',
yHex: 'b',
yBin: '1011'
},
{
xHex: 'a',
xBin: '1010',
yHex: '8',
yBin: '1000'
},
{
xHex: 'b',
xBin: '1011',
yHex: '9',
yBin: '1001'
},
{
xHex: 'c',
xBin: '1100',
yHex: 'e',
yBin: '1110'
},
{
xHex: 'd',
xBin: '1101',
yHex: 'f',
yBin: '1111'
},
{
xHex: 'e',
xBin: '1110',
yHex: 'c',
yBin: '1100'
},
{
xHex: 'f',
xBin: '1111',
yHex: 'd',
yBin: '1101'
}
]
Download script Convertto-IPV6.ps1 here or it is also available on https://github.com/kunaludapi.
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<#
.Synopsis
Convert MAC Address to IPV6.
.Description
This script converts given Mac Address to IPV6.
.Example
.\Convertto-IPV6.ps1 -Mac 00:00:00:00:00:00
It takes provided Mac and converts to reusable IPV6 address
.Notes
NAME: Convertto-IPV6.ps1
Version: 1.2
AUTHOR: Kunal Udapi
CREATIONDATE: 5 May 2017
LASTEDIT: 14 May 2020
KEYWORDS:Convert MAC Address to IPV6.
.Link
#Check Online version: http://kunaludapi.blogspot.com (Initially written for)
#Requires -Version 3.0
#>
########################################################################
# Generated On: 5 May 2017
# Generated By: vCloud-lab.com
# Tested On: last tested on Windows 10, Earlier tested on Windows 8.1
# For any question drop an question to [email protected]
########################################################################
#http://www.sput.nl/internet/ipv6/ll-mac.html
[CmdletBinding()]
param(
[Parameter(ValueFromPipeline=$True,ValueFromPipelineByPropertyName=$true)]
[alias('MacAddress')]
[String]$Mac = '00:15:5D:26:42:09'
) #param
$scriptPath = Split-Path -Parent $MyInvocation.MyCommand.Path
$rawHexTable = Get-Content $scriptPath\hexTable.json
$hexTable = $rawHexTable | ConvertFrom-Json
$insert = "{0}:ff:fe:{1}" -f $mac.Substring(0,8), $mac.Substring(9)
$splitIPV6Node = $insert -split ':'
$rawNotation = @()
for ($i=0; $i -lt $splitIPV6Node.Count; $i++)
{
#$splitIPV6Node[$i]
if ([math]::Floor($i%2) -eq 0)
{
$reFormat = $splitIPV6Node[$i]
}
else
{
$reFormat += $splitIPV6Node[$i]
$rawNotation += $reFormat
}
}
$IPV6Notation = $rawNotation -Join ':'
$firstNodeBin = $splitIPV6Node[0].substring(0,1)
$secondNodeBin = $splitIPV6Node[0].substring(1,1)
$secondProcessedHex = $hexTable | Where-Object {$_.xHex -eq $secondNodeBin} | Select-Object -ExpandProperty yHex
$completeIPV6 = "fe80::{0}{1}{2}" -f $firstNodeBin, $secondProcessedHex,$IPV6Notation.Substring(2)
$completeIPV6
|
Just for more information there are few online MAC address to IPv6 Link local converters available online you can check the same on http://www.sput.nl/internet/ipv6/ll-mac.html.
$mac = '00:15:5D:26:42:09' Invoke-WebRequest -Uri "https://ben.akrin.com/ipv6_mac_address_to_link_local_converter/?mode=api&mac=$mac" | Select-Object Content $ipv6 = 'fe80::215:5dff:fe26:4209' Invoke-WebRequest -Uri "https://ben.akrin.com/ipv6_link_local_to_mac_address_converter/?mode=api&ipv6=$ipv6" | Select-Object Content
At the moment of writing I found few online APIs, Which you can try yourself.
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