After restore a Windows Virtual Machine to original or alternate location, Virtual NIC settings may be changed or lost.

  • 記事 ID:100014791
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  • 製品:NetBackup

Problem

After restore a Windows Virtual Machine to original or alternate location, Virtual NIC settings may be changed or lost.

Because Windows detects Virtual NIC on a restored virtual machine as the new device and treats old one as ghosted device.

The following examples detects a Virtual NIC as the new device.

Original NIC settings:
This Virtual Machine already has a ghosted NIC (Local Area Connection 2, Intel(R) PRO/1000 MT Network Connection #2).

Ethernet adapter Local Area Connection 3:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection #3
Physical Address. . . . . . . . . : 00-50-56-A8-77-E4
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.10.10.20(Preferred)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection
Physical Address. . . . . . . . . : 00-50-56-A8-0A-3E
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.10.10.10(Preferred)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled

After restore to original location, Windows detects a Virtual NIC such as Local Area Connection 2, Intel(R) PRO/1000 MT Network Connection #2. Static IP settings are restored. But DHCP Enabled setting is not correct.

Ethernet adapter Local Area Connection 2:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection #2
Physical Address. . . . . . . . . : 00-50-56-A8-77-E4
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.10.10.20(Preferred)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection
Physical Address. . . . . . . . . : 00-50-56-A8-0A-3E
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.10.10.10(Preferred)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled


Original NIC settings:
This Virtual Machine already has a ghosted NIC (Local Area Connection 2, Intel(R) PRO/1000 MT Network Connection #2).

Ethernet adapter Local Area Connection 3:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection #3
Physical Address. . . . . . . . . : 00-50-56-A8-47-02
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.10.10.20(Preferred)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection
Physical Address. . . . . . . . . : 00-50-56-A8-56-8B
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.10.10.10(Preferred)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled

After restore to original location, Windows detects a Virtual NIC such as Local Area Connection 4, Intel(R) PRO/1000 MT Network Connection #4. This NIC is also automatically assigned as the private IP address.

Ethernet adapter Local Area Connection 4:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection #4
Physical Address. . . . . . . . . : 00-50-56-A8-47-02
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::b022:a594:cd67:eb9f%21(Preferred)
Autoconfiguration IPv4 Address. . : 169.254.235.159(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 352342102
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-49-AA-54-00-50-56-A8-56-8B
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection
Physical Address. . . . . . . . . : 00-50-56-A8-56-8B
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.10.10.10(Preferred)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled


Original NIC settings:
This Virtual Machine has VMXNET3 Virtual NIC.

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : vmxnet3 Ethernet Adapter
Physical Address. . . . . . . . . : 00-50-56-A8-64-0B
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.10.10.10(Preferred)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled

After restore to alternate location, Windows detects a Virtual NIC such as Local Area Connection 2, vmxnet3 Ethernet Adapter #2. This NIC is also automatically assigned as the private IP address.

Ethernet adapter Local Area Connection 2:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : vmxnet3 Ethernet Adapter #2
Physical Address. . . . . . . . . : 00-50-56-A8-05-2D
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::c412:4487:9d03:7800%16(Preferred)
Autoconfiguration IPv4 Address. . : 169.254.120.0(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 268456022
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-49-FF-CA-00-50-56-A8-64-0B
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled


Original NIC settings:
This Virtual Machine has E1000 Virtual NIC.

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection
Physical Address. . . . . . . . . : 00-50-56-A8-0F-A8
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::c521:5c85:e59f:ddaa%11(Preferred)
IPv4 Address. . . . . . . . . . . : 10.193.80.155(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.252.0
Default Gateway . . . . . . . . . : 10.193.80.1
DHCPv6 IAID . . . . . . . . . . . : 234901590
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-48-C6-B8-00-50-56-A8-0F-A8
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

After restore to alternate location, Windows detects a Virtual NIC such as Local Area Connection 2, Intel(R) PRO/1000 MT Network Connection #2. The IP address is also automatically assigned from DHCP.

Ethernet adapter Local Area Connection 2:

Connection-specific DNS Suffix . : lab.symc.local
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection #2
Physical Address. . . . . . . . . : 00-50-56-A8-39-B9
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::1022:9b4f:59d8:7eaa%21(Preferred)
IPv4 Address. . . . . . . . . . . : 10.193.82.13(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.252.0
Lease Obtained. . . . . . . . . . : Thursday, January 22, 2015 11:43:21 PM
Lease Expires . . . . . . . . . . : Saturday, January 24, 2015 11:43:21 PM
Default Gateway . . . . . . . . . : 10.193.80.1
DHCP Server . . . . . . . . . . . : 10.193.81.2
DHCPv6 IAID . . . . . . . . . . . : 352342102
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-49-AA-54-00-50-56-A8-56-8B

DNS Servers . . . . . . . . . . . : 10.193.81.2
Primary WINS Server . . . . . . . : 10.193.81.2
NetBIOS over Tcpip. . . . . . . . : Enabled

Error Message

When you reconfigure an IP address on restored virtual machine under existing ghost NIC, you may seen the following message.

The IP address XXX.XXX.XXX.XXX you have entered for this network adapter is already assigned to another adapter Name of adapter. Name of adapter is hidden from the network and Dial-up Connections folder because it is not physically in the computer or is a legacy adapter that is not working. If the same address is assigned to both adapters and they become active, only one of them will use this address. This may result in incorrect system configuration. Do you want to enter a different IP address for this adapter in the list of IP addresses in the advanced dialog box?

Ghost NIC can be also shown on restored virtual machine as the following.

  • Start command prompt.
  • Type the following command.

         set devirtual machinegr_show_nonpresent_devices=1

  • Type devmgmt.msc on this command prompt to launch Device Manager.
  • Click View, and then click Show Hidden Devices on device manager.

         For more information, please see the microsoft article http://support.microsoft.com/kb/269155

Cause

This issue may occur for one or more of the following senaios.

1. PCI Slot information may be changed on a restored virtual machine.

NetBackup currentry does not restore PCI slot information. After restore a Virtual Machine, PCI slot information are mapped automatically when first time a virtual machine is powered on. As a result, PCI Slot number for Virtual NIC may be changed. For more information, please see the article www.symantec.com/docs/TECH218205.

2. Virtual Macine has VMXNET3 Virtual NIC on Windows 7 or Windows 2008 R2.

When restore a Virtual Machine to alternate location, a restored Virtual Machine has Virtual NICs which new MAC address are assigned. Then, Windows 7 or Windows 2008 R2 detects these NICs as the new devices. For more information, please see the vmware article kb.vmware.com/kb/1020078.

3. Affected by Hot-Plug feature.

When removing and re-adding the hotplug devices while Virtual Machine is powered on, this may has ghosted NICs. After restore from this Virtual Machine backup, the issue may occur.

4. Unused Virtual NIC information in VMX file is not restored.

When removing a Virtual NIC while Virtual Machine is powered on, this has a unused Virtual NIC in VMX file as the following.(set "ethernet1.present" to FALSE and slot number to "-1", and other parameter such as MAC address remains.) After restore from this Virtual Machine backup, the issue may occur.

ethernet1.virtualDev = "e1000"
ethernet1.pciSlotNumber = "-1"
ethernet1.startConnected = "TRUE"
ethernet1.allowGuestConnectionControl = "TRUE"
ethernet1.features = "1"
ethernet1.wakeOnPcktRcv = "TRUE"
ethernet1.addressType = "vpx"
ethernet1.generatedAddress = "00:50:56:a8:7e:da"
ethernet1.networkName = "VM Network"
ethernet1.dvs.switchId = ""
ethernet1.present = "FALSE"
ethernet2.virtualDev = "e1000"
ethernet2.pciSlotNumber = "35"
ethernet2.startConnected = "TRUE"
ethernet2.allowGuestConnectionControl = "TRUE"
ethernet2.features = "1"
ethernet2.wakeOnPcktRcv = "TRUE"
ethernet2.addressType = "vpx"
ethernet2.generatedAddress = "00:50:56:a8:29:2e"
ethernet2.networkName = "VM Network"
ethernet2.dvs.switchId = ""
ethernet2.present = "TRUE"

5. Changed hardware version on restored virtual machine.

After restore a Virtual Machine without retaining hardware version, Virtual NIC settings may be lost on a restored Virtual Machine. 

Solution

Please reconfigure affected NIC settings manually.


Applies To

Windows Virtual Machine.

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