You encounter loss of packets and connectivity because virtual machines have duplicate MAC addresses generated by vCenter Server.
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Jan 31, 2011 I think we are all familiar with the manual MAC address issue - some software depends on the MAC for licensing, and in VMware you need to stick to a certain range of Ethernet addresses if you want to be able to manually put in your own MAC address. When a virtual machine is powered on, VMware Workstation automatically assigns each of its virtual network adapters an Ethernet MAC address. MAC stands for media access control. A MAC address is the unique address assigned to each Ethernet network device. The software guarantees that virtual machines are assigned unique MAC addresses within a given host system.
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Vmware Find Mac Address
The MAC addresses of virtual machines on the same broadcast domain or IP subnet are in conflict, or vCenter Server generates a duplicate MAC address for a newly created virtual machine.
A virtual machine powers on and functions properly, but shares a MAC address with another virtual machine. This situation might cause packet loss and other problems.
Cause
Virtual machines might have duplicate MAC addresses due to several reasons.
- Two vCenter Server instances with identical IDs generate overlapping MAC addresses for virtual machine network adapters.Each vCenter Server instance has an ID between 0 and 63 that is randomly generated at installation time, but can be reconfigured after installation. vCenter Server uses the instance ID to generate MAC addresses for the network adapters of the machine.
- A virtual machine has been transferred in power-off state from one vCenter Server instance to another in the same network, for example, by using shared storage, and a new virtual machine network adapter on the first vCenter Server receives the freed MAC address.
- Change the MAC address of a virtual machine network adapter manually. If you have an existing virtual machine with a conflicting MAC address, you must provide a unique MAC address in the Virtual Hardware settings.
- Power off the virtual machine, configure the adapter to use a manual MAC address, and type the new address.
- If you cannot power the virtual machine off for configuration, re-create the network adapter that is in conflict with enabled manual MAC address assignment and type the new address. In the guest operating system, set the same static IP address to the re-added adapter as before.
For information about configuring the network adapters of virtual machines, see the vSphere Networking and vSphere Virtual Machine Administration documentation. - If the vCenter Server instance generates the MAC addresses of virtual machines according to the default allocation, VMware OUI, change the vCenter Server instance ID or use another allocation method to resolve conflicts. Note:Changing the vCenter Server instance ID or switching to a different allocation scheme does not resolve MAC address conflicts in existing virtual machines. Only virtual machines created or network adapters added after the change receive addresses according to the new scheme.For information about MAC address allocation schemes and setup, see the vSphere Networking documentation.Change the vCenter Server IDYou can keep using the VMware OUI allocation scheme if your deployment contains a small number of vCenter Server instances. According to this scheme, a MAC address has the following format:where
00:50:56
represents the VMware OUI, XX is calculated as (80 + vCenter Server ID), and YY:ZZ is a random number.To change the vCenter Server ID, configure the vCenter Server unique ID option in the Runtime Settings section from the General settings of the vCenter Server instance and restart it.Jan 24, 2014 The cursor on my MacBook Air is stuck and won't move so I can't do anything. I've tried plugging in a mouse but that doesn't make any difference and also tried turning it off and restarting but still stuck in same position on restarting. Cant manual move cursor in outlook mac download. Oct 17, 2012 We've recently begun to notice that the mouse cursor will disappear once it is within any of the Outlook 2010 Windows. It doesn't seem to be consistent with machine type or mouse type. These are all Windows 7 Enterprise systems also. Hi, From your description, I understand that your mouse cursor disappeared as long as it is in the Outlook window. Oct 14, 2015 A few days ago I lost the ability to move the cursor with the mouse while I am composing an email message. The cursor actually disappears. If I save the message as Draft and then edit again, I can see the cursor and move it using arrow keys but not the mouse. Jun 23, 2019 I can't move the cursor in outlook with the mouse but can with the keyboard arrows Windows Vista, Office 12, has worked fine for 3 years, problem just started today This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread.The VMware OUI allocation works with up to 64 vCenter Server instances and is suitable for small scale deployments.Switch to prefix-based allocationYou can use a custom OUI. For example, for a02:12:34
locally administered address range, MAC addresses have the form02:12:34:XX:YY:ZZ
. You can use the fourth octet XX to distribute the OUI address space between the vCenter Server instances. This structure results in 255 address clusters, each cluster managed by a vCenter Server instance, and in about 65000 MAC addresses per vCenter Server. For example,02:12:34:01:YY:ZZ
for vCenter Server A,02:12:34:02:YY:ZZ
for vCenter Server B, and so on.Prefix-based allocation is suitable for deployments of a larger scale.For globally unique MAC addresses, the OUI must be registered in IEEE.- Configure MAC address allocation.
- Apply the new MAC address allocation scheme to an existing virtual machine in its Virtual Hardware settings.
- Power off a virtual machine, configure the adapter to use a manual MAC address, revert to automatic MAC address allocation, and power on the virtual machine.
- If the virtual machine is in production and you cannot power it off for configuration, after you change the vCenter Server ID or the address allocation scheme, re-create the network adapter in conflict with enabled automatic MAC address assignment. In the guest operating system, set the same static IP address to the re-added adapter as before.
- Enforce MAC address regeneration when transferring a virtual machine between vCenter Server instances by using the virtual machine files from a datastore.
- Power off a virtual machine, remove it from the inventory, and in its configuration file (.vmx), set the ethernetX.addressType parameter to generated.
X
next toethernet
stands for the sequence number of the virtual NIC in the virtual machine. - Import the virtual machine from one vCenter Server system to another by registering the virtual machine from a datastore in the target vCenter Server. The virtual machine files can reside in a datastore that is shared between the two vCenter Server instances or can be uploaded to a datastore that is accessible only from the target vCenter Server system.For information about registering a virtual machine from a datastore, see vSphere Virtual Machine Administration.
- Power on the virtual machines for the first time. While the virtual machine is starting up, an information icon appears on the virtual machine in the vSphere Web Client.
- Right-click the virtual machine and select Guest OS > Answer Question.
- Select the I Copied It option.
The target vCenter Server re-generates the MAC address of the virtual machine. The new MAC address starts with the VMware OUI00:0c:29
and is based on the BIOS UUID of the virtual machine. The BIOS UUID of the virtual machine is calculated from the BIOS UUID of the host. - Power off a virtual machine, remove it from the inventory, and in its configuration file (.vmx), set the ethernetX.addressType parameter to generated.
- If the vCenter Server and hosts are version 6.0 and later and the vCenter Server instances are connected in Enhanced Linked Mode, migrate virtual machines by using vMotion across vCenter Server systems. When a virtual machine is migrated across vCenter Server systems, the source vCenter Server adds the MAC address of the virtual machine to a blacklist and does not assign them to other virtual machines.