No networking connection after installing Win 2008 svr on a VM.

We just installed a win 2008 svr on a vm and we found  out there is no network connection at all. I assumed the network card we picked Vmxnet 2 (enhance) cannot find the driver. What can we do now? Please help.
CastlewoodAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You need to select either VMXNET2 or VMXNET3 (if available and better).

and you will need to install VMware Tools for  VMXNET2 or VMXNET3 drivers and support.

see my EE Article

Part 8: HOW TO: Install VMware Tools for Windows on a VMware Windows virtual machine on a VMware vSphere Hypervisor 5.1 (ESXi 5.1) Host Server
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CastlewoodAuthor Commented:
Then how to change the nic from vmxnet2 (enhanced) to others at this point since in 'Edit Setting' the nic selection for this vm is dimmed out.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Remove the NIC, and Re-Add the NIC (VMXNET3).

Install VMware Tools first.
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CastlewoodAuthor Commented:
So I need to install VMware Tools for every VM, correct?
After I installed the Tools on this VM, I seems to get the network connection now. Do you think I still need to change the nic from vmxnet 2 (enhanced) to others? (I'm asking since I'm afraid some issues may be hidden for this nic on this version of server.)
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes! You need to install VMware Tools for every VM, you may need to read my EE Article then!

What version of ESXi, if 5.x, then VMXNET3 is better.
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CastlewoodAuthor Commented:
mine is ESXi 6.0. Do you think  I still need to change the nic from vmxnet 2 (enhanced) to others?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, you should really be using VMXNET3 for every VM.
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CastlewoodAuthor Commented:
Okay. got it.
A side-tracked question... If a vm is currently power off, it will not currently use its assigned memory or all other resources, correct?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Correct. It will use storage space though!
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CastlewoodAuthor Commented:
Thanks Andrew. Another question, if we need to change the resources, say increasing memory, do we need to shut down the vm?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
All these should be new questions, which you should post. So last one!

Yes and No, depends if the OS supports Hot Add Memory, and the VM is configured for Hot Add.

But, usually yes.
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CastlewoodAuthor Commented:
install the VMware Tools first then add one nic xmxnet 3, and then remove the current nic
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