Linux/ubuntu Port Open

Under Ubuntu Open port seems to have two main methods, one is Ubuntu comes with the firewall, one is iptables, here we mainly use iptables. The system version for this article is ubuntu14.04 and ubuntu16.04

Installing Iptables

In general, when Ubuntu is installed, Iptables will be installed, there is no installation and nothing, a command can be installed.

Apt-get Install Iptables

Once you've installed it, you're ready to add rules.

Iptables-i input-p TCP--dport 80-j ACCEPT

You can then directly save the

Iptables-save

Persistent iptables

The above does only temporarily save the open port information, if the server restarts, the saved information is dropped, so we need to persist the port information, here we use iptables-persistent

Installing Iptables-persistent

Apt-get Install Iptables-persistent

Persistent information

Service Iptables-persistent Save

　　

Linux/ubuntu Port Open