Once you have verified the network setup information, test the network environment.
Use the ping command to test the connection between two systems. For example, from sydney, test the connection to melbourne:
ping melbourne
For example, if you are running dbaccess on sydney, and you are testing the connection to a database server on melbourne, select paul and g_paul.
If you can connect to the host database server, the host server is trusted for user informix.
For more information, see the IBM Informix DB–Access User's Guide.