Added the note from OSDOCS-8613 into the IPI bare metal docs.

Signed-off-by: John Wilkins <jowilkin@redhat.com>

Author: johnwilkins

installing/installing_bare_metal_ipi/ipi-install-prerequisites.adoc

@@ -39,6 +39,11 @@ xref:../../installing/installing_bare_metal_ipi/ipi-install-troubleshooting.adoc
 
 include::modules/ipi-install-network-requirements.adoc[leveloffset=+1]
 
+[role="_additional-resources"]
+.Additional resources
+
+* xref:../../networking/dns-operator#nw-dns-forward_dns-operator[Using DNS forwarding]
+
 include::modules/ipi-install-configuring-nodes.adoc[leveloffset=+1]
 
 include::modules/ipi-install-out-of-band-management.adoc[leveloffset=+1]

modules/ipi-install-network-requirements.adoc

@@ -44,6 +44,11 @@ Certain ports must be open between cluster nodes for installer-provisioned insta
 
 |====
 
+[NOTE]
+====
+For installer-provisioned infrastructure installations, CoreDNS exposes port 53 at the node level, making it accessible from other routable networks.
+====
+
 [id="network-requirements-increase-mtu_{context}"]
 == Increase the network MTU