iptable无法启动

无法启动,提示:iptables: Firewall is not running.
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查看当前系统加载的模块
lsmod|grep ip_tables
lsmod|grep iptable_filter
如果有,应该能正常启动

查看iptables相关外挂模块
ls -al /lib/modules/`uname -r`/kernel/net/ipv4/netfilter|grep iptable_filter
ls -al /lib/modules/`uname -r`/kernel/net/ipv4/netfilter|grep ip_tables
如果有,就执行:
modprobe ip_tables
modprobe iptable_filter
modprobe iptable_mangle
modprobe iptable_nat