问题现象：
Grid安装到最后一步，两边的root脚本也执行完了，撂出个INS-20802错误，从错误现象来看，看不出什么问题，提示查看.log文件。
Log文件内容：
INFO: Checking Single Client Access Name (SCAN)...
INFO: Checking name resolution setup for "SCAN"...
INFO: ERROR:
INFO: PRVF-4664 : Found inconsistent name resolution entries for SCAN name "SCAN"
INFO: ERROR:
INFO: PRVF-4657 : Name resolution setup check for "SCAN" (IP address: 172.16.9.150) failed
INFO: ERROR:
INFO: PRVF-4664 : Found inconsistent name resolution entries for SCAN name "SCAN"
INFO: Verification of SCAN VIP and Listener setup failed
问题分析：
