$ORACLE_HOME/network/admin/listener.ora
LISTENER =
(DESCRIPTION_LIST =(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.75.168.183)(PORT = 1521))
)
)
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = ora11g)
(ORACLE_HOME = /DB/oracle/11gR2/db)
(SID_NAME = ora11g)
)
)