10/18/2021 How Many Mac Addresses Are Available For Virtual Network Adapters, Created By Hyper-V?Read Now
Microsoft has posted a support article on this scenario:First NIC interface takes MAC address from Bootloader. Uplink port profiles are used to represent the network segments (VLANs) in the configuration of a physical switch port to which a Hyper-V host is connected.This is not a scenario I’ve encountered … not too many of us will ever have more than 256 virtual NICs on a single host. Two types of port profiles exist, ‘Uplink’ and ‘Virtual Adapter’. VMM can then assign these addresses statically to VMs or Hyper-V hosts.
![]() ![]() And that means each host can have 256 MAC addresses, by default.There are workarounds to this, if you are in the very rare situation where you need more than 256 MAC addresses on a single host.Turn off (shut down) the VM and assign static MAC addresses. Which is 0 to 255, or 256 numbers. An octet is 8 bits, from 00000000 to 11111111. 01:86 is unique to the range on this host. 00:15:5d is the manufacturer unique 3 octets for Microsoft “devices”. The MAC address range is defined by two registry values in HKLMSoftwareMicrosoftWindows NTCurrentVersionVirtualization:In my example (above), you can see the range runs from 00:15:5d:01:86:ff. Install flash player for google chrome on macStack Overflow has a script example to query lots of servers that you could tweak. PowerShell will come in handy if you want to get the details exiting MAC ranges on your Hyper-V hosts. A SQL whiz might be able to run a query in ConfigMgr to report on existing MAC addresses from physical devices. If you do have to, then (in my opinion) you should be using System Center. Changing the fifth octet is the risky one … remember that the 4th and 5th octets are unique per host.If you don’t have this massive environment then don’t touch these dynamic MAC address ranges unless you have to.
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