Add ACSCS Central access restrictin documentation

Author: kurlov

cloud_service/rhacs-cloud-service-service-description.adoc

@@ -134,6 +134,16 @@ Our customer support team offers Bomgar as a remote access solution for troubles
 
 To prevent information leakage, logs are shipped to SRE through our security information and event management (SIEM) application, Splunk.
 
+[id="access-restriction_{context}"]
+=== Central access restriction by IP addresses and CIDR ranges
+
+Restricting access to Central ensures that only trusted IP addresses can interact with the security policy enforcement point, thereby strengthening the overall security posture.
+
+To request restricted access to Central, please visit the following link:https://access.redhat.com/support[Red Hat Customer Portal].
+From the Customer Portal, submit a support case requesting the restriction of access to Central.
+Be sure to provide the list of trusted IP addresses and CIDR ranges.
+The maximum number of IP addresses and CIDR ranges is 55.
+
 include::modules/cloud-svc-compliance.adoc[leveloffset=+1]
 
 include::modules/data-protection.adoc[leveloffset=+1]