OCPBUGS-35851_4.15#adding missing port details

modules/installation-about-custom-azure-vnet.adoc

@@ -130,6 +130,74 @@ include::snippets/mcs-endpoint-limitation.adoc[]
 
 Because cluster components do not modify the user-provided network security groups, which the Kubernetes controllers update, a pseudo-network security group is created for the Kubernetes controller to modify without impacting the rest of the environment.
 
+.Ports used for all-machine to all-machine communications
+[cols="2a,2a,5a",options="header"]
+|===
+
+|Protocol
+|Port
+|Description
+
+|ICMP
+|N/A
+|Network reachability tests
+
+.3+|TCP
+|`1936`
+|Metrics
+
+|`9000`-`9999`
+|Host level services, including the node exporter on ports `9100`-`9101` and
+the Cluster Version Operator on port `9099`.
+
+|`10250`-`10259`
+|The default ports that Kubernetes reserves
+
+.6+|UDP
+|`4789`
+|VXLAN
+
+|`6081`
+|Geneve
+
+|`9000`-`9999`
+|Host level services, including the node exporter on ports `9100`-`9101`.
+
+|`500`
+|IPsec IKE packets
+
+|`4500`
+|IPsec NAT-T packets
+
+|`123`
+|Network Time Protocol (NTP) on UDP port `123`
+
+If you configure an external NTP time server, you must open UDP port `123`.
+
+|TCP/UDP
+|`30000`-`32767`
+|Kubernetes node port
+
+|ESP
+|N/A
+|IPsec Encapsulating Security Payload (ESP)
+
+|===
+
+.Ports used for control plane machine to control plane machine communications
+[cols="2a,2a,5a",options="header"]
+|===
+
+|Protocol
+|Port
+|Description
+
+|TCP
+|`2379`-`2380`
+|etcd server and peer ports
+
+|===
+
 [role="_additional-resources"]
 .Additional resources