CentOS6.x的iptables防火墙如何打开指定的端口
2019-11-05 阅读 : 次
例:当修改了ssh远程连接端口,如何在iptables上放行新的端口(这里将默认22端口号修改为33端口号)。
输入命令放行33端口。
[root@niaoyun ~]# iptables -I INPUT -p tcp --dport 33 -j ACCEPT
查看防火墙规则,发现33端口号已经放行了。
[root@niaoyun ~]# iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:33
295 23186 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
34 2310 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
2342 200K REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT 15 packets, 1412 bytes)
pkts bytes target prot opt in out source destination
iptables规则已经更改,我们需要对规则进行保存。
[root@niaoyun ~]# service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]
保存完毕,重启iptables服务。
[root@niaoyun ~]# 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 ]
同样,用此方法也可以放行web的默认端口80。
iptables -I INPUT -p tcp --dport 80 -j ACCEPT && service iptables save && service iptables restart
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