<p>I'm setting up a mixed-mode kubernetes cluster (CentOS7 master, WS2019 worker) using Flannel in overlay (VXLAN) mode. I've gotten through the <a href="https://learn.microsoft.com/en-us/virtualization/windowscontainers/kubernetes/joining-windows-workers?tabs=ManagementIP" rel="nofollow noreferrer">Microsoft Kubernetes for Windows Instructions</a> but when I kick off start.ps1 I'm stuck in the "Waiting for the Network to be created" loop referenced <a href="https://learn.microsoft.com/en-us/virtualization/windowscontainers/kubernetes/common-problems#after-launching-startps1-flanneld-is-stuck-in-waiting-for-the-network-to-be-created" rel="nofollow noreferrer">here</a>. Launching flanneld directly per their instructions, I get the following error:</p>

<blockquote>
  <p>E0306 16:43:21.218797     2576 main.go:289] Error registering network: Cannot find network with Management IP [IPAddrofWorkerNIC].</p>
</blockquote>

<p>The IP referenced is the main IP of the worker on the "Ethernet" NIC as called per the <code>--iface</code> argument to flanneld.</p>

<p>The master and worker are both Hyper-v VMs off of a Win10 1809 box with MAC spoofing enabled. I confirmed that 6433/tcp, 10250/tcp, 4096/udp, and 4789/udp are opened in firewalld of the master. I also tried again after disabling firewalld, with no change, so I don't think the issue is on the master side.</p>

<p>I tried digging through the <a href="https://github.com/coreos/flannel/blob/master/main.go" rel="nofollow noreferrer">flanneld Go code</a> at the referenced line 289 for clues but I'm not familiar with Go and had to concede defeat.</p>

<p>Any ideas why I would be getting this error?</p>

<p>Apparently I didn't read the requirements closely enough. Flannel VXLAN on Windows isn't supported until Kubernetes 1.14 which will release March 25.</p>

<pre><code>Overlay networking: use Flannel in vxlan mode to configure a virtual overlay network

-     requires either Windows Server 2019 with KB4482887 installed or Windows Server vNext Insider Preview Build 18317+
-     requires Kubernetes v1.14 (or above) with WinOverlay feature gate enabled
-     requires Flannel v0.11.0 (or above)
</code></pre>
