Connecting to 11g R2 RAC without using SCAN

 
hi

We have a 10g R2 client and we need to connect to the 11g R2 database without using SCAN entry and instead use the VIPs

when we try to execute tnsping <11gRACDB> , we get TNS-12541 - No Listener

We have the following in our tnsnames.ora


PRODTST =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.20.31)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.20.33)(PORT = 1521))
    (LOAD_BALANCE = yes)
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = prodtst)
      (FAILOVER_MODE =
              (TYPE = SELECT)
              (METHOD = BASIC)
              (RETRIES = 180)
              (DELAY = 5)
      )
    )
  )


In above, the 2 IPs are the VIPs

what we could be missing here?

How can we verify if the listeners are listening on port 1521 for both the VIPs?