Oracle Network Products Troubleshooting Guide
Requirements
Trace Route works only over SQL*Net release 2.3. Every node along the route from client to server must use SQL*Net 2.3. If a pre-2.3 node is on the path, the following error is displayed:
TNS-03603: Encountered a node with pre-2.3 version of SQL*Net
Note: TRCROUTE will be most useful when the route traverses several Oracle MultiProtocol Interchanges. It can be a boon to troubleshooting because it shows what node along the path is responsible for any errors. At the time of this release, however, MultiProtocol Interchanges do not use SQL*Net 2.3.