Checksumming is the comparison of data sent over the connection as seen by both client and server.

To configure checksumming:

1. Click the Profile icon.

2. Choose Advanced Security Option from the drop-down list box.

3. Click the Integrity tab.

4. Enable client or server checksumming by clicking in either the Client or Server checkbox.

5. Specify the degree of checksumming behavior as a client is connecting to a server by selecting a value from the Checksum Level drop-down list box.

   You may select one of the following options:

   Accepted:	Service will be active if the other side of the connection specifies either "required" or "requested", and there is a compatible algorithm available on the other side; it will otherwise be inactive.
   Rejected:	Service must not be active, and the connection will fail if the other side specifies "required".
   Requested:	Service will be active if the other side of the connection specifies either "accepted", "required", or "requested", and there is a compatible algorithm available on the other side; it will otherwise be inactive.
   Required:	Service must be active, and the connection will fail if the other side specifies "rejected", or if there is no compatible algorithm on the other side.

6. Choose Save Network Configuration from the File menu to save changes to SQLNET.ORA in $ORACLE_HOME/network/admin on UNIX or ORACLE_HOME\network\admin on Windows platforms, or choose Save As from the File menu to save under a different file name or path.