Merge pull request #86874 from brendan-daly-red-hat/OSDOCS-6962

OSDOCS-6962#adding custom IPv4 support

Author: xenolinux

modules/installation-configuration-parameters.adoc

@@ -407,6 +407,15 @@ endif::ibm-power-vs[]
 Set the `networking.machineNetwork` to match the CIDR that the preferred NIC resides in.
 ====
 
+|networking:
+  ovnKubernetesConfig:
+    ipv4:
+      internalJoinSubnet:
+|
+Configures the IPv4 join subnet that is used internally by `ovn-kubernetes`. This subnet must not overlap with any other subnet that {product-title} is using, including the node network. The size of the subnet must be larger than the number of nodes. You cannot change the value after installation.
+
+|An IP network block in CIDR notation. The default value is `100.64.0.0/16`.
+
 |====
 
 [id="installation-configuration-parameters-optional_{context}"]