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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. You can manually assign a MAC address to a virtual machine. You might want to assign a MAC address to guarantee that the same address is assigned to a virtual machine every time it powers on, even it is moved, or to be sure that a unique MAC address is provided for each virtual machine in a networked environment. Aug 12, 2013 Unfortunately you cannot just edit an automatically generated MAC address, because the ranges for manually and automatically generated MAC addresses are different and enforced by VMware. If you want to ensure a MAC address remains the same at all times even if you switch virtual network adapters, you may assign a static MAC address to the VM.
- Maintaining and Changing the MAC Address of a Virtual Machine 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.
- VMware ESX Server virtual machines do not support arbitrary MAC addresses, hence the above format must be used. As long as you choose a hex value that is unique among your hard-coded addresses, conflicts between the automatically assigned MAC addresses and the manually assigned ones should never occur.
- Changeing a VMware VM's MAC Address from Automatic to Static. Edit the machine settings, go to the NIC Properties, and select manual for the MAC address and put in the desired MAC address. Experts Exchange Solution brought to you. I have tried to change this MAC address from automatic from static both through the GUI.
I wish to distribute a VMWare VM for users (who are technically challenged and unable to install a complex product). Users may run several instances of the VM in their environment, so it's essential that each VM have NIC's with unique MAC addresses.
Is there a way to distribute the VM in such a way that on first boot if forces new MAC addresses onto the NIC's?
If users just add the VM to their inventory and select 'moved' instead of 'copied' then they get the same MAC's (I believe).
I'm using VMWare WOrkstation 12 in case that matters.
TSGTSG1 Answer
The canonical 'correct' way to distribute VM images for VMware vSphere is to distribute .ova files created using ovftool, and then use the vSphere GUI to install the .ova file. This automatically distributes a 'copied' version of the virtual machine that has a different MAC address when deployed. However, there is a way to do the job if you're going to instead distribute a zipped up VMware Workstation directory. What you need to do is, immediately before you zip up the directory, is first copy the .vmx file someplace else. Then edit the vmx file and look for a line that looks like
Remove that line from the vmx file.
Then zip it up and distribute it. That should give you copy of the virtual machine that does not have a built in MAC address and that should generate a new MAC address upon deployment. (This is assuming a VM with a single Ethernet interface). Then copy the original .vmx file back into place.
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Note that for certain operating systems, such as Red Hat Enterprise Linux 6, there are udev rules that tie a specific Ethernet interface to a specific MAC address. These must be removed to allow eth0 to come up after the deployment. If your operating system is one of those, that is a separate question.
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I have some software running on a Windows virtual machine. Adobe acrobat mac 10.1.16 manual. I am using VMWare as the virtualization technology. The problem comes in with the software's activation / registration. The company who created the software is using the machine's MAC address to uniquely identify the machine during the process.
Whenever I reboot the VM image I get a new dynamic MAC address, which then causes the software to de-activate itself. Is there a way I can setup the VM image so that it will always use the same static MAC address?
Vmware Automatic Vs Manual Mac Address 1
Chopper32 Answers
Short answer that glosses over the details; VMware will usually provide a unique MAC address for a VM on a network. It will usually provide the same MAC address to a VM so long as the VM is not moved between hosts. In circumstances where this a changing mac address is a problem, you can manually set one.
To manually assign an address, edit the config file for the VM;Remove
and add
XX must be a valid hexadecimal number between 00h and 3Fh, and YY and ZZ must be valid hexadecimal numbers between 00h and FFh
This is how it's done with Server, Workstation, and GSX (and I presume Fusion) The basics are the same for ESX, but what mac addresses you can use are different.
For more, search the VMware knowledge base for the articles
'Setting a static MAC address for a virtual NIC', 'Changing the MAC Address of a virtual Machine' and other articles with 'MAC Address' in their title.
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Yes, but you have to edit the VM's config file directly via the COS, with the VM shutdown too (I think).