本想做些防火墙策略。防火墙策略都是写在/etc/sysconfig/iptables文件里面的。可我发现我也没有这个文件。[root@xiaohuai /]# cd /etc/sysconfig/

[root@xiaohuai sysconfig]# ls

atd firstboot irqbalance network-scripts rhn sysstat

auditd grub kdump ntpd rngd sysstat.ioconf

authconfig htcacheclean kernel ntpdate rsyslog system-config-firewall

cbq httpd keyboard prelink sandbox system-config-firewall.old

clock i18n modules quota_nld saslauthd udev

console init netconsole raid-check selinux

cpuspeed ip6tables-config network readahead smartmontools

crond iptables-config networking readonly-root sshd

[root@xiaohuai sysconfig]#

解决办法：

1. 随便写一条iptables命令配置个防火墙规则。如：iptables -P OUTPUT ACCEPT。[root@xiaohuai /]# cd /etc/sysconfig/

[root@xiaohuai sysconfig]# iptables -P OUTPUT ACCEPT

2. service iptables save进行保存。[root@xiaohuai sysconfig]# service iptables save

iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]

[root@xiaohuai sysconfig]# ls

atd firstboot iptables-config networking readonly-root sshd

auditd grub irqbalance network-scripts rhn sysstat

authconfig htcacheclean kdump ntpd rngd sysstat.ioconf

cbq httpd kernel ntpdate rsyslog system-config-firewall

clock i18n keyboard prelink sandbox system-config-firewall.old

console init modules quota_nld saslauthd udev

cpuspeed ip6tables-config netconsole raid-check selinux

crond iptables network readahead smartmontools

[root@xiaohuai sysconfig]#

3. service iptables restart命令重启：[root@xiaohuai sysconfig]# service iptables restart

iptables: Setting chains to policy ACCEPT: filter [ OK ]

iptables: Flushing firewall rules: [ OK ]

iptables: Unloading modules: [ OK ]

iptables: Applying firewall rules: [ OK ]

[root@xiaohuai sysconfig]#