报错信息如下：
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[oracle@odd ~]$ lsnrctl status
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 01-MAY-2013 15:40:54
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error
Linux Error: 113: No route to host
netca 报错信息截图如下：
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[root@odd ~]# hostname -f
odd.example.com
[root@odd ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:0C:29:67:0C:98
inet addr:192.168.1.112 Bcast:255.255.255.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe67:c98/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1254 errors:0 dropped:0 overruns:0 frame.:0
TX packets:128 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:444873 (434.4 KiB) TX bytes:12771 (12.4 KiB)
[root@odd ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
192.168.1.114 even.example.com even
192.168.1.115 odd.example.com odd
看了上面的输出、大家应该明白了、hosts 文件里面主机名和IP参差不齐