Merge pull request #75863 from sr1kar99/9399-adding-ntp-123-port-in-net-con-req

OSDOCS#9399: Added NTP/UDP 123 port in network connectivity requirements table

Author: skopacz1

modules/installation-network-user-infra.adoc

@@ -159,7 +159,7 @@ the Cluster Version Operator on port `9099`.
 |`10250`-`10259`
 |The default ports that Kubernetes reserves
 
-.5+|UDP
+.6+|UDP
 |`4789`
 |VXLAN
 
@@ -175,6 +175,11 @@ the Cluster Version Operator on port `9099`.
 |`4500`
 |IPsec NAT-T packets
 
+|`123`
+|Network Time Protocol (NTP) on UDP port `123`
+
+If an external NTP time server is configured, you must open UDP port `123`.
+
 |TCP/UDP
 |`30000`-`32767`
 |Kubernetes node port