Docs - adding note/example about not specifying GPDB ports that conflict with OS.
connections are created during operations such as query execution. Transient connections for
query execution processes, data movement, and statistics collection use available ports in the
range 1025 to 65535 with both TCP and UDP protocols. </p>
+ <note>To avoid port conflicts between Greenplum Database and other applications when
+ initializing Greenplum Database, do not specify Greenplum Database ports in the range
+ specified by the operating system parameter <codeph>net.ipv4.ip_local_port_range</codeph>. For
+ example, if <codeph>net.ipv4.ip_local_port_range = 10000 65535</codeph>, you could set the
+ Greenplum Database base port numbers to values outside of that
+ range:<codeblock>PORT_BASE = 6000
+MIRROR_PORT_BASE = 7000
+REPLICATION_PORT_BASE = 8000
+MIRROR_REPLICATION_PORT_BASE = 9000</codeblock></note>
<p>Some add-on products and services that work with Greenplum Database have additional
networking requirements. The following table lists ports and protocols used within the
Greenplum cluster, and includes services and applications that integrate with Greenplum
