Login Database use sqlnet slow,it can take 40sec

System is Redhat 5.4
Database 11g
When i try to connection the Database use
conn system/[email protected]:1521/orcl.localdomain
it will take 40 sec to complete the connection
why it can used so long times,and connect successful
my pc is connect to server direct.
the firewall and the selinux is disable.
lsnrctl status is:
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.0.91)(PORT=1521)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 30-JAN-2010 18:50:06
Uptime 1 days 19 hr. 20 min. 30 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora
Listener Log File /u/oracle/app/oracle/diag/tnslsnr/localhost/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.0.91)(PORT=1521)))
Services Summary...
Service "Oracle8" has 1 instance(s).
Instance "ORCL", status UNKNOWN, has 1 handler(s) for this service...
Service "orcl.localdomain" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB.localdomain" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully
try to tnsping is fast.
Attempting to contact (DESCRIPTION=(CONNECT_DATA=(SERVICE_NAME=192.168.0.91))(AD
DRESS=(PROTOCOL=TCP)(HOST=192.168.0.91)(PORT=1521)))
OK (20 ms)
sqlnet.ora file:
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
ADR_BASE = /u/oracle/app/oracle
listener.ora file:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = Oracle8)
(ORACLE_HOME = /u/oracle/app/oracle/product/11.2.0/dbhome_1)
(SID_NAME = ORCL)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.91)(PORT = 1521))
ADR_BASE_LISTENER = /u/oracle/app/oracle
tnsnames.ora file:
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.91)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl.localdomain)
POLD=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.1.2)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)

thank you for reply
it can ping success.not the network problem
i solve it myself just now.
vi /etc/resolv.conf
and
mark
search localdomain
#nameserver 192.168.1.1
the trouble is the nameserver. just make it diable .
and test it .
fastest now.

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