Client Connection to RAC: Simple checks to Confirm Access to Listener Endpoints

Here are some simple checks using tnsping to confirm that a remote client can reach all the listener endpoints in a RAC cluster.

While we don't advocate the use of  tnsping to test performance of a listener or TCP network, this tool can help

determine why a remote client might not reach an address for either VIP or SCAN listener in a cluster.

Keep in mind that all SCAN endpoints and all VIP endpoints should be available to a remote client that expects to connect to

the RAC cluster.

In the event of an error that indicates either a hostname resolution issue or a TCP timeout, the following tnsping checks