Linux下查看防火墙状态 - linux

使用service方式：

1.管理员权限下使用service iptables status查看当前防火墙状态：

[root@localhost wys]# service iptables status

iptables: Firewall is not running. //说明没有开启

2.service iptables start开启防火墙

iptables: Applying firewall rules: [ OK ]

然后在查看一下状态

Table: filter

Chain INPUT (policy ACCEPT)

num target prot opt source destination

1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED

2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0

3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0

4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22

5 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)

num target prot opt source destination

1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)

num target prot opt source destination

3.service iptables stop关闭防火墙：

iptables: Flushing firewall rules: [ OK ]

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

iptables: Unloading modules: [ OK ]

系统重启后不开启防火墙：chkconfig iptables off

重启开启：chkconfig iptables on

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