[oracle
@bogon ~]$ lsnrctl start LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 19-JUL-2012 20:15:40 Copyright (c) 1991, 2009, Oracle. All rights reserved. Starting /opt/app/oracle/product/11.2.0/db_1/bin/tnslsnr: please wait... TNSLSNR for Linux: Version 11.2.0.1.0 - Production
System parameter file is /opt/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Log messages written to /opt/app/oracle/diag/tnslsnr/bogon/listener/alert/log.xml
Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle11)(PORT=1521)))
TNS-12545: Connect failed because target host or object does not exist
TNS-12560: TNS:protocol adapter error
TNS-00515: Connect failed because target host or object does not exist
Listener failed to start. See the error message(s) above...