环境：主机windows xp 虚拟机centos 6.4
[root@localhost /]# iptables -I INPUT -p tcp --dport 80 -j ACCEPT
[root@localhost /]# /etc/rc.d/init.d/iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]
[root@localhost /]# cd /etc
[root@localhost etc]# cd init.d
[root@localhost init.d]# ls
auditd crond halt iptables keepalived lvm2-lvmetad netconsole network rdisc rsyslog saslauthd sshd
blk-availability functions ip6tables jexec killall lvm2-monitor netfs postfix restorecond sandbox single udev-post
[root@localhost init.d]# /etc/init.d/iptables restart
iptables: Flushing firewall rules: [ OK ]
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: [ OK ]
[root@localhost init.d]#