Tentei implementar o controle de bloqueio por ip no oracle utilizando os comandos
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
TCP.VALIDNODE_CHECKING - YES #INFORMA QUE DEVE VERIFICAR IP'S
TCP.INVITED_NODES= (192.168.10.10, 192.168.10.11) #INFORMA OS IP'S PERMITIDOS
TCP.EXCLUDED_NODES= (192.168.10.254) #INFORMA OS IP'S QUE NÃO SÃO PERMITIDOS
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 19-AUG-2014 13:53:46
Copyright 1991, 2005, Oracle. All rights reserved.
Starting /opt/oracle/app/oracle/product/10.2.0/db_1/bin/tnslsnr: please wait...
TNSLSNR for Linux: Version 10.2.0.1.0 - Production
System parameter file is /opt/oracle/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Log messages written to /opt/oracle/app/oracle/product/10.2.0/db_1/network/log/listener.log
Error listening on: (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
TNS-12542: TNS:address already in use
TNS-12560: TNS:Protocol adapter error
TNS-00512: Address already in use
Linux Error: 98: Address already in use
Listener failed to start. See the error message above...