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vSphere 5.1 and later provides several schemes for automatic allocation of MAC addresses in vCenter Server. You can select the scheme that best suits your requirements for MAC address duplication, OUI requirements for locally administered or universally administered addresses, and so on.

The following schemes of MAC address generation are available in vCenter Server:

  • VMware OUI allocation, default allocation
  • Prefix-based allocation
  • Range-based allocation

After the MAC address is generated, it does not change unless the virtual machine's MAC address conflicts with that of another registered virtual machine. The MAC address is saved in the configuration file of the virtual machine.

Note: If you use invalid prefix- or range-based allocation values, an error is logged in the vpxd.log file. vCenter Server does not allocate MAC addresses when provisioning a virtual machine.

Preventing MAC Address Conflicts

Next, choose a destination folder for VMware vCenter Converter Standalone and click Next. Then choose a setup-type: local installation to deploy only VMware vCenter Converter Standalone, or Client-Server installation if you want to install agent and client additionally. I choose local installation because I don’t want to convert the server.

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Include two or more physical NICs in a team to increase the network capacity of a vSphere Standard Switch or standard port group. Configure failover order to determine how network traffic is rerouted in case of adapter failure. Select a load balancing algorithm to determine how the standard switch distributes the traffic between the physical NICs in a team. VMware Organizationally Unique Identifier (OUI) allocation assigns MAC addresses based on the default VMware OUI 00:50:56 and the vCenter Server ID. Prefix-Based MAC Address Allocation On ESXi hosts 5.1 and later, you can use prefix-based allocation to specify an OUI other than the default one 00:50:56 by VMware, or to introduce Locally.

The MAC address of a powered off virtual machine is not checked against the addresses of running or suspended virtual machines.

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When a virtual machine is powered on again, it might acquire a different MAC address. The change might be caused by an address conflict with another virtual machine. While this virtual machine has been powered off, its MAC address has been assigned to another virtual machine that has been powered on.

If you reconfigure the network adapter of a powered off virtual machine, for example, by changing the automatic MAC address allocation type or setting a static MAC address, vCenter Server resolves MAC address conflicts before the adapter reconfiguration takes effect.

For information about resolving MAC address conflicts, see the vSphere Troubleshooting Download deep freeze serial number. documentation.

Include two or more physical NICs in a team to increase the network capacity of a vSphere Standard Switch or standard port group. Configure failover order to determine how network traffic is rerouted in case of adapter failure. Select a load balancing algorithm to determine how the standard switch distributes the traffic between the physical NICs in a team.

Configure NIC teaming, failover, and load balancing depending on the network configuration on the physical switch and the topology of the standard switch. See Teaming and Failover Policy and Load Balancing Algorithms Available for Virtual Switches for more information.

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If you configure the teaming and failover policy on a standard switch, the policy is propagated to all port groups in the switch. If you configure the policy on a standard port group, it overrides the policy inherited from the switch.


  1. In the vSphere Client, navigate to the host.
  2. On the Configure tab, expand Networking and select Virtual Switches.
  3. Navigate to the Teaming and Failover policy for the standard switch, or standard port group. Option
    Standard Switch
    1. Select the switch from the list.
    2. Click Edit settings and select Teaming and failover.
    Standard port group
    1. Select the switch where the port group resides.
    2. From the switch topology diagram, select the standard port group and click Edit settings.
    3. Select Teaming and failover.
    4. Select Override next to the policies that you want to override.
  4. From the Load balancing drop-down menu, specify how the virtual switch load balances the outgoing traffic between the physical NICs in a team. Option
    Route based on the originating virtual portSelect an uplink based on the virtual port IDs on the switch. After the virtual switch selects an uplink for a virtual machine or a VMkernel adapter, it always forwards traffic through the same uplink for this virtual machine or VMkernel adapter.
    Route based on IP hash

    Select an uplink based on a hash of the source and destination IP addresses of each packet. For non-IP packets, the switch uses the data at those fields to compute the hash .

    IP-based teaming requires that the physical switch is configured with EtherChannel.

    Route based on source MAC hashSelect an uplink based on a hash of the source Ethernet.
    Use explicit failover order From the list of active adapters, always use the highest order uplink that passes failover detection criteria. No actual load balancing is performed with this option.
  5. From the Network failure detection drop-down menu, select the method that the virtual switch uses for failover detection. Option
    Link status only

    Relies only on the link status that the network adapter provides. This option detects failures such as removed cables and physical switch power failures.

    Beacon probing

    Sends out and listens for beacon probes on all NICs in the team, and uses this information, in addition to link status, to determine link failure.ESXi sends beacon packets every second.

    The NICs must be in an active/active or active/standby configuration because the NICs in an unused state do not participate in beacon probing.

  6. From the Notify switches drop-down menu, select whether the standard or distributed switch notifies the physical switch in case of a failover.
    Note: Set this option to No if a connected virtual machine is using Microsoft Network Load Balancing in unicast mode. No issues exist with Network Load Balancing running in multicast mode.
  7. From the Failback drop-down menu, select whether a physical adapter is returned to active status after recovering from a failure.

    If failback is set to Yes, the default selection, the adapter is returned to active duty immediately upon recovery, displacing the standby adapter that took over its slot, if any.

    If failback is set to No for a standard port, a failed adapter is left inactive after recovery until another currently active adapter fails and must be replaced.

  8. Specify how the uplinks in a team are used when a failover occurs by configuring the Failover Order list.
    If you want to use some uplinks but reserve others for emergencies in case the uplinks in use fail, use the up and down arrow keys to move uplinks into different groups.
    Active adaptersContinue to use the uplink if the network adapter connectivity is up and active.
    Standby adaptersUse this uplink if one of the active physical adapter is down.
    Unused adapters Do not use this uplink.
  9. Click OK.