如何找到centos中的iptables文件？
1随便写一条iptables命令配置个防火墙规则。如：iptables -P OUTPUT ACCEPT。
[root@iZ23gx7o02aZ /]# cd /etc/sysconfig/[root@iZ23gx7o02aZ sysconfig]# iptables -P OUTPUT ACCEPT
2. service iptables save进行保存。
[root@iZ23gx7o02aZ sysconfig]# service iptables saveiptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ][root@iZ23gx7o02aZ sysconfig]# lsatd firstboot iptables-config networking readonly-root sshdauditd grub irqbalance network-scripts rhn sysstatauthconfig htcacheclean kdump ntpd rngd sysstat.ioconfcbq httpd kernel ntpdate rsyslog system-config-firewallclock i18n keyboard prelink sandbox system-config-firewall.oldconsole init modules quota_nld saslauthd udevcpuspeed ip6tables-config netconsole raid-check selinuxcrond iptables network readahead smartmontools[root@iZ23gx7o02aZ sysconfig]#
3. service iptables restart命令重启：
[root@iZ23gx7o02aZ sysconfig]# service iptables restartiptables: Setting chains to policy ACCEPT: filter [ OK ]iptables: Flushing firewall rules: [ OK ]iptables: Unloading modules: [ OK ]iptables: Applying firewall rules: [ OK ][root@iZ23gx7o02aZ sysconfig]#
相关参考：centOS教程
