yum卸载NetworkManager
iptables -F
iptables -x
service iptables save
shell> perl -MCPAN -e shell　进去后安装的

cpan[1]> install Time::HiRes
CPAN: Storable loaded ok (v2.18)
Going to read /root/.cpan/Metadata
  Database was generated on Tue, 29 Dec 2009 02:51:00 GMT
CPAN: YAML loaded ok (v0.70)
Going to read /root/.cpan ild/
............................................................................DONE
Found 1 old build, restored the state of 1
Time::HiRes is up to date (1.9719).
 
 
Redhat系统，修改/etc/sysconfig/selinux文件：
#SELINUX=enforcing
SELINUX=disabled
重启生效，如果不想重启，用命令
setenforce 0