If you use Oracle Names, with or without the Dynamic Discovery Option, you must decide what nodes should contain Names Servers, which provide name and address information to enable connections throughout the network. You should have a Name Server in every community. In general, Oracle recommends that Names Servers in a multi-community network be placed on Interchange nodes, thereby minimizing the number of Names Servers required. A Names Server located on an Interchange node can serve both communities.
If you are adding SQL*Net release 2.3 to an existing network, or if you have a lot of non-default parameters in your configuration files, then you may want to continue to use Oracle Network Manager even if you are using Oracle Names release 2.0 and the Dynamic Discovery Option.
Use Oracle Names release 2.0 and the Dynamic Discovery Option if you are installing SQL*Net for the first time, and if you expect your network to grow and change. If you already have an established network, you can add Oracle Names release 2.0 and the Dynamic Discovery Option if you wish. As your network grows, all new nodes that use SQL*Net 2.3 can use the dynamic registration option while the rest of the network uses configuration files generated by Oracle Network Manager.
For further information about Oracle Names, see the Oracle Names Administrator's Guide.