Linux下iptables防火墙放开相关端口拒绝相关端口及查看已放开端口


我用的是fedora 14

1. 查看iptables 防火墙已经开启的端口:/etc/init.d/iptables status

[root@hzswtb2-mpc ~]#/etc/rc.d/init.d/iptables status 或者 service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306

Chain FORWARD (policy ACCEPT)
num target prot opt source destination

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination

 

2. 开启 tcp 8080端口

/sbin/iptables -I INPUT -p tcp --dport 8080 -j ACCEPT

/etc/rc.d/init.d/iptables save 或者 service iptables save #保存配置 /etc/rc.d/init.d/iptables restart 或者 service iptables restart #重启服务

[root@hzswtb2-mpc ~]# /sbin/iptables -I INPUT -p tcp --dport 8080 -j ACCEPT
[root@hzswtb2-mpc ~]# /etc/rc.d/init.d/iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]
[root@hzswtb2-mpc ~]# /etc/rc.d/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@hzswtb2-mpc ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8080
2 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306

3. 删除chain INPUT指定规则1；

[root@hzswtb2-mpc ~]# iptables -D INPUT 1
[root@hzswtb2-mpc ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306

Chain FORWARD (policy ACCEPT)
num target prot opt source destination

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination

4.Reject 指定端口；

[root@hzswtb2-mpc ~]# /sbin/iptables -I INPUT -p tcp --dport 8080 -j REJECT
[root@hzswtb2-mpc ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 REJECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8080 reject-with icmp-port-unreachable
2 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306

Chain FORWARD (policy ACCEPT)
num target prot opt source destination

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination

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