The Port range size shows the number of ports that will be reserved for TCP/IP communications between the partitions.
Specify the ports that you want to allocate for communications between partitions in the TCP/IP port range fields.
You require one port for each logical partition on a server.
The DB2 Setup wizard verifies that the port range that you specify is available on this server; however, you must ensure that this range is available on all other servers that will take part in this partitioned database system.