When Live Migrating VM’s to a different host there’s no problem and the VM will keep the same MAC. Even if you sysprep the host before you image it, the registry values are not reset. Once the MAC address pool is created when the Hyper-V role is installed, imaging the host will cause each Hyper-V server deployed using the image to have the same MAC address pool.
Make sure you do not use the same range on different Hyper-V hosts!! So, if you not take care it is possible to accidentally deploy hosts with duplicate MAC address pools. Hyper-V has an algorithm to deal with duplicate MAC addresses on a single host, but not across multiple hosts. You could set your own MAC here, using the static MAC option.īut what happens when you have more than 1 host? You can view the MAC of a VM under “Settings > Network Adapter > Advanced Features”Īs you can see the allocated MAC is within the specified MAC range. So every new VM gets a MAC address in this range specified on the Hyper-V host. You can see/edit the range under the “Virtual Switch Manager”. In the Hyper-V Manager you can set a specific range what addresses are allocated to the VM’s. There are many threads on technet forums about virtual machines changing MAC addresses and especially Linux virtual machines losing network connection. It seems easy to setup and never look at it again but this can cause some serious issues. Unofficial study guide: VMware vSphere 5.In this post I’m going to talk about the MAC Address Pools in Hyper-V / VMM and the actual way they work.The final eight bits of the MAC address are set to a hash value based on the name of the virtual machine’s configuration file.įor example, if a machine's IP address was 192.34.14.81 (or in hex, 0xc0220e51) and the configuration file was hashed to the value of 95, the MAC address would have the following value: 00:05:69:0e:51:95 References:.The first 16 bits are set to the same values as the last 16 bits of the console operating system’s primary IP address.vSphere 5.5, 6.5, VMware Workstation 15Īffects products: Outdated VMWare solutions: VMware ESX, VMware GSX ServerĪccording to the VMware OUI allocation scheme, the hypervisor generates MAC addresses that consists of the VMware OUI 00:05:69 and the last three octets generated by the following algorithm:.Official Documentation: Specify a MAC Address Range for VMware Horizon FLEX.
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