Setup of NLB on Windows 2012r2 HyperV cluster

lstanke
lstanke used Ask the Experts™
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I have a Windows 2012r2 2 node cluster.  The cluster nodes are hosts for HyperV VMs.

I have 2 new web server VMs and would like to put them in a NLB cluster.  

My confusion is the multicast/unicast implementation and how to implement with the hosts and the guest web servers.  Also, do I have to do something at the physical switches?

I want to be sure there is no negative impact to my other VMs.  

Ive tried to read up on this, but still not sure exactly how to implement.

Thanks for any guidance.
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Network Engineer
Commented:
I used unicast, which to me is simpler because no changes required on t ghost e switches. You do need two NICs on each VM you want to participate in the NLB. There is also a settings that you need to set on the VMs NIC to allow mac address spoofing.  That's what I remember it as.you can Google it.

Windows NLB is brain dead. I server will start participating in NLB and receive traffic as long as the network stacking up, even if the service isn't. This means that booting a VM will cause a partial outage on your site (s) because it will start getting traffic before IIS has even started. It will also get traffic after you stop IIS. My solution for this is to run startup and shutdown scripts to disable NLB on shutdown,  and then enable NLB on boot, but only as after a delay of a minute or two so the machine can finish booting before it starts to accept traffic. The whole think is hokey,  and not really suitable for something public facing. For anything important,  get a real load balancer such as one from Kemp. We have the virtual version now.

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