Oracle Database Discussions

I am not able to connect to any Database from SQL Developer by providing "localhost" as Hostname. I could able to connect by providing the IP(192.168.1.50) of the system.

The problem here is If I am out of internet, My system does not have IP, So I am not able to connect to DB

But I need to submit a project wheere I will not have any internet. Could you please let me know how to connect to DB using localhost

Following are the listener.ora and tnsnames.ora files.

listener.ora
----------------------
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.50)(PORT = 1521))
)
)

=============================

tnsnames.ora
---------------------------
# tnsnames.ora Network Configuration File: D:\oracle\product\10.2.0\db_2\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

ORA9 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.50)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ora9)
)
)

ORA8 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.50)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ora8)
)
)

EMP =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.50)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = emp)
)
)

ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.50)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)


Thanks in advance,
Srini