BZ2072523: Use single domain network for all nodes

Author: xenolinux

modules/installation-vsphere-installer-infra-requirements.adoc

@@ -249,7 +249,7 @@ Available resources vary between clusters. The number of possible clusters withi
 [id="installation-vsphere-installer-infra-requirements-networking_{context}"]
 == Networking requirements
 
-You must use DHCP for the network and ensure that the DHCP server is configured to provide persistent IP addresses to the cluster machines.
+You must use DHCP for the network and ensure that the DHCP server is configured to provide persistent IP addresses to the cluster machines. All nodes must be in the same VLAN. You cannot scale the cluster using a second VLAN as a Day 2 operation.
 ifdef::restricted[]
 The VM in your restricted network must have access to vCenter so that it can provision and manage nodes, persistent volume claims (PVCs), and other resources.
 endif::restricted[]