# Listener Configuration, TCP/IP Protocol

TCP/IP identifies a listener protocol address by a port number. Select the port number to use.

Use the standard port number of 1521:

Select this option to listen on the default port of 1521. Oracle Corporation highly recommends that you do not change this port number for client connections to a database service.

By default, dynamic service registration uses a listener configured on TCP/IP on port 1521.

Use another port number:

Select this option to specify another port to use other than 1521. The listener should be the only piece of software on this computer that is listening on the port you specify.

| Note: To have dynamic service registration registration for a non-default TCP/IP address, you must configure the LOCAL_LISTENER parameter in the initialization parameter file and resolve the listener name through a naming method. See Chapter 7, Configuring the Listener, in the Net8 Administrator's Guide.

| Caution: Other components of Net8 use different listening port numbers, such as 1575 for an Oracle Names server and 1630 for an Oracle Connection Manager. You should not use these ports for your listener protocol address.