This is a PowerCLI script to enable IPv6 on VMware ESXi hosts in you vCenter.
This problem is that disabling IPv6 in newer versions of ESXi can sometimes result in PSOD, so even if you are not using IPv6 in your environment, you should keep it enabled. https://kb.vmware.com/s/article/2150794
Import-Module VMware.PowerCLI
Connect-VIServer <Insert vCenter name>
$VMHost = Get-VMHost <insert hostname>
$esxcli = Get-EsxCli -VMHost $VMhost -V2
$argument = $esxcli.system.module.parameters.set.CreateArgs()
$argument.module = "tcpip4"
$argument.parameterstring = "ipv6=1"
$esxcli.system.module.parameters.set.Invoke($argument)
Write-Host "IPv6 Enabled for host: $($VMHost)"
Write-Host "You need to put the host in maintenance mode and reboot for changes to take effect."Hope this helps you. Keep in mind that use of this script is entirely your responsibility, and you should always understand what a script does before you run it.
To detect which host that has IPv6 disabled check this post: https://vm.knutsson.it/?p=1193