证券简称:互盟科技 | 证券代码:838935

Linux中iptables中如何打开指定的端口

例:当修改了ssh远程连接端口,如何在iptables上打开新的端口(这里将默认22端口号修改为33端口号)

#输入命令打开33端口。

[root@niaoyun ~]# iptables -I INPUT -p tcp --dport 33 -j ACCEPT
#查看防火墙规则,发现33端口号已经打开了。
[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,用此方法也可以打开web的默认端口80